Stefan Kozlov vs James Duckworth Head-to-Head Stats & Results
USA Stefan KozlovStefan Kozlov - USA
56 Average Form
L
W
L
W
W
L
L
ATP Rank
256
Elo Score
213
Age 28, 1.83m, 79kg
H2H Record
0 - 1
Wins
0% - 100%
Sets Won
0 - 2
James Duckworth has won more matches in head to head against Stefan Kozlov
AustraliaJames DuckworthAustralia - James Duckworth
Struggling Form 47
L
L
W
W
W
W
L
ATP Rank
79
Elo Score
722
Age 34, 1.83m, 82kg
Verdict : James Duckworth has won more matches in head to head against Stefan Kozlov
H2H Stats
Latest Results
ALL SURFACES
HARD •
CLAY •
GRASS •
Head-to-Head - Full Stats
Performance
Profile
Data Point
Stefan Kozlov
James Duckworth
Prize Money
Career
Career
$1,058,176USD
$4,021,607USD
Current Rank
256
79
Wins
H2H
H2H
0(0.0%)
1(100.0%)
Sets Won
H2H
H2H
0(0.0%)
2(100.0%)
Win Percentage
2026 Calendar Year
2026 Calendar Year
55.6%15 / 27 Matches
47.1%8 / 17 Matches
Win Percentage
Last 12 Months
Last 12 Months
64.8%35 / 54 Matches
55.1%38 / 69 Matches
Data Point
Stefan Kozlov
James Duckworth
Main Hand
Right-handed
Right-handed
Age
28
34
Birthday
February 1, 1998
January 21, 1992
Height
1.83m
1.83m
Weight
79kg
82kg
Head-to-Head Record
Date
Tournament
Results
Oct 18
2019
Las Vegas Chall. Men
Hard
Stefan Kozlov
0
-2
James Duckworth
Win Percentage (Match / Set)
2026 Calendar Year
Last 12 Months
Data Point
Stefan Kozlov
James Duckworth
Match Wins
56%
47%
Match Wins (3 Sets)
54%
47%
Match Wins (5 Sets)
N/A
50%
Wins in Straight Sets
33%
29%
Wins From Behind
8%
25%
Won At Least 1 Set
74%
59%
Set 1 Win
52%
47%
Set 2 Win
56%
41%
Set 3 Win
55%
33%
Set 4 Win
N/A
100%
Set 5 Win
N/A
100%
Data Point
Stefan Kozlov
James Duckworth
Match Wins
65%
55%
Match Wins (3 Sets)
63%
55%
Match Wins (5 Sets)
N/A
33%
Wins in Straight Sets
37%
39%
Wins From Behind
17%
16%
Won At Least 1 Set
83%
71%
Set 1 Win
61%
58%
Set 2 Win
59%
52%
Set 3 Win
60%
44%
Set 4 Win
N/A
50%
Set 5 Win
N/A
50%
Aces - Over/Under, Match Total, Average (3 Set Matches)
2026 Calendar Year
Last 12 Months
Milestones
Over
Under
Data Point
Stefan Kozlov
James Duckworth
Match Total
Aces Per Match
2.96
8.20
11.16
Most Aces in a match
27%
47%
N/A
1+
85%
100%
98%
2+
58%
100%
96%
3+
42%
100%
96%
4+
38%
87%
96%
5+
31%
80%
83%
6+
12%
53%
74%
7+
12%
53%
65%
8+
4%
40%
54%
9+
4%
40%
50%
10+
4%
33%
48%
15+
0%
7%
24%
20+
0%
7%
17%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Over 0.5
85%
100%
98%
Over 1.5
58%
100%
96%
Over 2.5
42%
100%
96%
Over 3.5
38%
87%
96%
Over 4.5
31%
80%
83%
Over 5.5
19%
60%
74%
Over 6.5
12%
53%
65%
Over 7.5
4%
40%
54%
Over 8.5
4%
40%
50%
Over 9.5
4%
33%
48%
Over 10.5
0%
27%
45%
Over 11.5
0%
20%
41%
Over 12.5
0%
20%
40%
Over 13.5
0%
13%
32%
Over 14.5
0%
7%
24%
Over 15.5
0%
7%
24%
Over 16.5
0%
7%
24%
Over 17.5
0%
7%
24%
Over 18.5
0%
7%
17%
Over 19.5
0%
7%
17%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Under 0.5
15%
0%
2%
Under 1.5
42%
0%
4%
Under 2.5
58%
0%
4%
Under 3.5
62%
13%
4%
Under 4.5
69%
20%
18%
Under 5.5
81%
40%
27%
Under 6.5
88%
47%
36%
Under 7.5
96%
60%
46%
Under 8.5
96%
60%
50%
Under 9.5
96%
67%
52%
Under 10.5
100%
73%
55%
Under 11.5
100%
80%
59%
Under 12.5
100%
80%
61%
Under 13.5
100%
87%
68%
Under 14.5
100%
93%
77%
Milestones
Over
Under
Data Point
Stefan Kozlov
James Duckworth
Match Total
Aces Per Match
2.70
7.58
10.28
Most Aces in a match
26%
52%
N/A
1+
85%
100%
98%
2+
59%
100%
97%
3+
41%
97%
95%
4+
30%
88%
92%
5+
24%
77%
80%
6+
9%
48%
73%
7+
9%
48%
69%
8+
2%
40%
55%
9+
2%
35%
46%
10+
2%
25%
43%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Over 0.5
85%
100%
98%
Over 1.5
59%
100%
97%
Over 2.5
41%
97%
95%
Over 3.5
30%
88%
92%
Over 4.5
24%
77%
80%
Over 5.5
15%
63%
73%
Over 6.5
9%
48%
69%
Over 7.5
2%
40%
55%
Over 8.5
2%
35%
46%
Over 9.5
2%
25%
43%
Over 10.5
0%
17%
39%
Over 11.5
0%
14%
33%
Over 12.5
0%
11%
31%
Over 13.5
0%
9%
26%
Over 14.5
0%
8%
22%
Over 15.5
0%
8%
20%
Over 16.5
0%
6%
17%
Over 17.5
0%
5%
17%
Over 18.5
0%
3%
13%
Over 19.5
0%
3%
12%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Under 0.5
15%
0%
2%
Under 1.5
41%
0%
4%
Under 2.5
59%
3%
6%
Under 3.5
70%
12%
9%
Under 4.5
76%
23%
21%
Under 5.5
85%
37%
28%
Under 6.5
91%
52%
32%
Under 7.5
98%
60%
45%
Under 8.5
98%
65%
55%
Under 9.5
98%
75%
57%
Under 10.5
100%
83%
61%
Under 11.5
100%
86%
67%
Under 12.5
100%
89%
70%
Under 13.5
100%
91%
74%
Under 14.5
100%
92%
78%
Match Total Games - Over/Under
2026 Calendar Year
Last 12 Months
Total Games In A Set
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
James Duckworth
Average
Average Games in a Set
9.63
10.18
9.91
Over 6.5
96%
100%
98%
Over 7.5
85%
93%
89%
Over 8.5
65%
73%
69%
Over 9.5
46%
53%
50%
Over 10.5
27%
33%
30%
Over 11.5
27%
33%
30%
Over 12.5
19%
33%
26%
Data Point
Stefan Kozlov
James Duckworth
Average
Over 12.5
100%
100%
100%
Over 13.5
100%
100%
100%
Over 14.5
100%
93%
97%
Over 15.5
100%
93%
97%
Over 16.5
96%
93%
95%
Over 17.5
85%
73%
79%
Over 18.5
73%
53%
63%
Over 19.5
69%
47%
58%
Over 20.5
62%
47%
55%
Over 21.5
58%
33%
46%
Over 22.5
46%
33%
40%
Over 23.5
35%
33%
34%
Over 24.5
35%
33%
34%
Over 25.5
35%
33%
34%
Over 26.5
23%
27%
25%
Over 27.5
19%
20%
20%
Over 28.5
15%
20%
18%
Over 29.5
15%
20%
18%
Data Point
Stefan Kozlov
James Duckworth
Average
Over 18.5
N/A
100%
50%
Over 19.5
N/A
100%
50%
Over 20.5
N/A
100%
50%
Over 21.5
N/A
100%
50%
Over 22.5
N/A
100%
50%
Over 23.5
N/A
100%
50%
Over 24.5
N/A
100%
50%
Over 25.5
N/A
50%
25%
Over 26.5
N/A
50%
25%
Over 27.5
N/A
50%
25%
Over 28.5
N/A
50%
25%
Over 29.5
N/A
50%
25%
Over 30.5
N/A
50%
25%
Over 31.5
N/A
50%
25%
Over 32.5
N/A
50%
25%
Over 33.5
N/A
50%
25%
Over 34.5
N/A
50%
25%
Over 35.5
N/A
50%
25%
Over 36.5
N/A
50%
25%
Over 37.5
N/A
50%
25%
Total Games In A Set
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
James Duckworth
Average
Average Games in a Set
9.37
10.01
9.69
Over 6.5
96%
100%
98%
Over 7.5
78%
94%
86%
Over 8.5
61%
80%
71%
Over 9.5
45%
48%
47%
Over 10.5
25%
32%
29%
Over 11.5
25%
32%
29%
Over 12.5
18%
25%
22%
Data Point
Stefan Kozlov
James Duckworth
Average
Over 12.5
98%
98%
98%
Over 13.5
96%
98%
97%
Over 14.5
94%
97%
96%
Over 15.5
92%
95%
94%
Over 16.5
90%
94%
92%
Over 17.5
84%
78%
81%
Over 18.5
76%
71%
74%
Over 19.5
75%
58%
67%
Over 20.5
65%
55%
60%
Over 21.5
59%
49%
54%
Over 22.5
53%
45%
49%
Over 23.5
43%
40%
42%
Over 24.5
43%
40%
42%
Over 25.5
35%
35%
35%
Over 26.5
29%
31%
30%
Over 27.5
25%
29%
27%
Over 28.5
22%
25%
24%
Over 29.5
16%
22%
19%
Data Point
Stefan Kozlov
James Duckworth
Average
Over 18.5
N/A
100%
50%
Over 19.5
N/A
100%
50%
Over 20.5
N/A
100%
50%
Over 21.5
N/A
100%
50%
Over 22.5
N/A
100%
50%
Over 23.5
N/A
100%
50%
Over 24.5
N/A
100%
50%
Over 25.5
N/A
67%
33%
Over 26.5
N/A
67%
33%
Over 27.5
N/A
67%
33%
Over 28.5
N/A
67%
33%
Over 29.5
N/A
67%
33%
Over 30.5
N/A
67%
33%
Over 31.5
N/A
67%
33%
Over 32.5
N/A
67%
33%
Over 33.5
N/A
67%
33%
Over 34.5
N/A
67%
33%
Over 35.5
N/A
67%
33%
Over 36.5
N/A
67%
33%
Over 37.5
N/A
67%
33%
Break of Serve (Break Points Won) - Over/Under
2026 Calendar Year
Last 12 Months
3 Set Matches
5 Set Matches
Breaks Per Set
Data Point
Stefan Kozlov
James Duckworth
Match Total
Breaks Per Match
2.35
2.27
4.62
Over 0.5
58%
67%
100%
Over 1.5
42%
13%
97%
Over 2.5
42%
13%
97%
Over 3.5
23%
0%
55%
Over 4.5
4%
0%
48%
Over 5.5
4%
0%
40%
Over 6.5
0%
0%
10%
Over 7.5
0%
0%
6%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Breaks Per Match
N/A
3.75
2.75
Over 0.5
N/A
50%
50%
Over 1.5
N/A
50%
50%
Over 2.5
N/A
50%
50%
Over 3.5
N/A
50%
50%
Over 4.5
N/A
0%
50%
Over 5.5
N/A
0%
25%
Over 6.5
N/A
0%
25%
Over 7.5
N/A
0%
25%
Over 8.5
N/A
0%
25%
Over 9.5
N/A
0%
25%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Average Break-Points Converted (Set 1)
0.83
1.17
2
Average Break-Points Converted (Set 2)
1.33
1.07
2.4
Average Break-Points Converted (Set 3)
0.68
0.5
1.18
will Break Serve %
15%
63%
N/A
will not Break Serve %
63%
41%
N/A
Over 0.5
46%
67%
95%
Over 1.5
15%
0%
65%
Over 2.5
0%
0%
36%
Over 3.5
0%
0%
4%
Over 4.5
0%
0%
0%
Over 5.5
0%
0%
0%
Over 6.5
0%
0%
0%
Over 7.5
0%
0%
0%
Breaks Per Set data uses Set 1 as a sample.
3 Set Matches
5 Set Matches
Breaks Per Set
Data Point
Stefan Kozlov
James Duckworth
Match Total
Breaks Per Match
2.86
2.16
5.02
Over 0.5
76%
85%
100%
Over 1.5
63%
58%
96%
Over 2.5
61%
48%
94%
Over 3.5
41%
12%
63%
Over 4.5
20%
3%
51%
Over 5.5
9%
0%
34%
Over 6.5
2%
0%
21%
Over 7.5
0%
0%
15%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Breaks Per Match
N/A
3.67
2.67
Over 0.5
N/A
67%
50%
Over 1.5
N/A
67%
50%
Over 2.5
N/A
33%
50%
Over 3.5
N/A
33%
50%
Over 4.5
N/A
0%
50%
Over 5.5
N/A
0%
33%
Over 6.5
N/A
0%
33%
Over 7.5
N/A
0%
16%
Over 8.5
N/A
0%
16%
Over 9.5
N/A
0%
16%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Average Break-Points Converted (Set 1)
1.11
0.93
2.04
Average Break-Points Converted (Set 2)
1.3
1.01
2.31
Average Break-Points Converted (Set 3)
1.05
0.7
1.75
will Break Serve %
34%
48%
N/A
will not Break Serve %
50%
33%
N/A
Over 0.5
63%
72%
96%
Over 1.5
37%
18%
63%
Over 2.5
9%
0%
33%
Over 3.5
0%
0%
10%
Breaks Per Set data uses Set 1 as a sample.
Double Faults - Over/Under
2026 Calendar Year
Last 12 Months
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
James Duckworth
Match Total
Double Faults Per Match
3.96
3.67
7.63
Over 0.5 (1+)
92%
80%
97%
Over 1.5 (2+)
73%
67%
94%
Over 2.5 (3+)
62%
53%
90%
Over 3.5 (4+)
54%
53%
88%
Over 4.5 (5+)
42%
40%
77%
Over 5.5 (6+)
31%
33%
66%
Over 6.5 (7+)
23%
20%
63%
Over 7.5 (8+)
12%
7%
52%
Over 8.5 (9+)
8%
7%
34%
Over 9.5 (10+)
0%
7%
24%
Over 10.5 (11+)
0%
0%
20%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Double Faults Per Match
N/A
4.5
N/A
Over 0.5 (1+)
N/A
100%
50%
Over 1.5 (2+)
N/A
100%
50%
Over 2.5 (3+)
N/A
100%
50%
Over 3.5 (4+)
N/A
100%
50%
Over 4.5 (5+)
N/A
50%
50%
Over 5.5 (6+)
N/A
0%
50%
Over 6.5 (7+)
N/A
0%
25%
Over 7.5 (8+)
N/A
0%
25%
Over 8.5 (9+)
N/A
0%
25%
Over 9.5 (10+)
N/A
0%
25%
Over 10.5 (11+)
N/A
0%
25%
Over 11.5 (12+)
0%
0%
N/A
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
James Duckworth
Match Total
Double Faults Per Match
2.98
2.75
5.73
Over 0.5 (1+)
87%
78%
98%
Over 1.5 (2+)
63%
65%
91%
Over 2.5 (3+)
50%
45%
83%
Over 3.5 (4+)
33%
34%
75%
Over 4.5 (5+)
24%
22%
65%
Over 5.5 (6+)
17%
14%
55%
Over 6.5 (7+)
13%
9%
48%
Over 7.5 (8+)
7%
6%
34%
Over 8.5 (9+)
4%
2%
22%
Over 9.5 (10+)
0%
2%
16%
Over 10.5 (11+)
0%
0%
8%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Double Faults Per Match
N/A
5.33
4.33
Over 0.5 (1+)
N/A
100%
50%
Over 1.5 (2+)
N/A
100%
50%
Over 2.5 (3+)
N/A
100%
50%
Over 3.5 (4+)
N/A
100%
50%
Over 4.5 (5+)
N/A
67%
50%
Over 5.5 (6+)
N/A
33%
50%
Over 6.5 (7+)
N/A
33%
33%
Over 7.5 (8+)
N/A
0%
33%
Over 8.5 (9+)
N/A
0%
33%
Over 9.5 (10+)
N/A
0%
33%
Over 10.5 (11+)
N/A
0%
33%
Tie Breaks - Over/Under
2026 Calendar Year
Last 12 Months
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
(Match)
(Match)
James Duckworth
(Match)
(Match)
Average
Tie Breaks Per Match
0.38
0.53
0.46
Over 0.5
38%
40%
39%
Over 1.5
0%
13%
7%
Over 2.5
0%
0%
0%
Under 0.5
62%
60%
39%
Under 1.5
100%
87%
7%
Under 2.5
100%
100%
0%
Data Point
Stefan Kozlov (Match)
James Duckworth (Match)
Average
Tie Breaks Per Match
N/A
0.5
N/A
Over 0.5
N/A
50%
25%
Over 1.5
N/A
0%
N/A
Over 2.5
N/A
0%
N/A
Under 0.5
N/A
50%
25%
Under 1.5
N/A
100%
50%
Under 2.5
N/A
100%
50%
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
(Match)
(Match)
James Duckworth
(Match)
(Match)
Average
Tie Breaks Per Match
0.33
0.54
0.44
Over 0.5
33%
43%
38%
Over 1.5
0%
11%
5%
Over 2.5
0%
0%
0%
Under 0.5
33%
43%
38%
Under 1.5
0%
11%
5%
Under 2.5
0%
0%
0%
Data Point
Stefan Kozlov (Match)
James Duckworth (Match)
Average
Tie Breaks Per Match
N/A
0.67
N/A
Over 0.5
N/A
67%
33%
Over 1.5
N/A
0%
N/A
Over 2.5
N/A
0%
N/A
Under 0.5
N/A
33%
16%
Under 1.5
N/A
100%
50%
Under 2.5
N/A
100%
50%
Net Points Won - Over/Under
2026 Calendar Year
Last 12 Months
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
James Duckworth
Match Total
Net Points Won Per Match
14.22
7.17
21.39
Over 4.5 (5+)
96%
80%
88%
Over 5.5 (6+)
92%
73%
83%
Over 6.5 (7+)
88%
73%
81%
Over 7.5 (8+)
84%
60%
72%
Over 8.5 (9+)
80%
47%
64%
Over 9.5 (10+)
76%
40%
58%
Over 10.5 (11+)
72%
33%
53%
Over 11.5 (12+)
56%
13%
35%
Over 14.5 (12+)
32%
7%
20%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Net Point Won Per Match
N/A
15.25
N/A
Over 4.5 (5+)
N/A
100%
N/A
Over 5.5 (6+)
N/A
100%
N/A
Over 6.5 (7+)
N/A
100%
N/A
Over 7.5 (8+)
N/A
100%
N/A
Over 8.5 (9+)
N/A
100%
N/A
Over 9.5 (10+)
N/A
100%
N/A
Over 10.5 (11+)
N/A
100%
N/A
Over 11.5 (12+)
N/A
100%
N/A
Over 14.5 (15+)
N/A
50%
N/A
Over 19.5 (20+)
N/A
50%
N/A
Over 22.5 (23+)
N/A
50%
N/A
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
James Duckworth
Match Total
Net Points Won Per Match
14.36
7.9
22.26
Over 4.5 (5+)
97%
78%
88%
Over 5.5 (6+)
94%
76%
85%
Over 6.5 (7+)
88%
63%
76%
Over 7.5 (8+)
85%
54%
70%
Over 8.5 (9+)
79%
43%
61%
Over 9.5 (10+)
73%
39%
56%
Over 10.5 (11+)
67%
35%
51%
Over 11.5 (12+)
52%
26%
39%
Over 14.5 (15+)
30%
13%
22%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Net Points won Per Match
N/A
16.33
15.33
Over 4.5 (5+)
N/A
100%
50%
Over 5.5 (6+)
N/A
100%
50%
Over 6.5 (7+)
N/A
100%
50%
Over 7.5 (8+)
N/A
100%
50%
Over 8.5 (9+)
N/A
100%
50%
Over 9.5 (10+)
N/A
100%
50%
Over 10.5 (11+)
N/A
100%
50%
Over 11.5 (12+)
N/A
100%
50%
Over 14.5 (15+)
N/A
67%
33%
Over 19.5 (20+)
N/A
33%
33%
Over 22.5 (23+)
N/A
50%
16%
Head-to-Head (Hard Courts)
Performance
Profile
Data Point
Stefan Kozlov
James Duckworth
Wins
H2H
H2H
0(0.0%)
1(100.0%)
Sets Won
H2H
H2H
0(0.0%)
2(100.0%)
Win Percentage
2026 Calendar Year
2026 Calendar Year
55.0%11 / 20 Matches
30.0%3 / 10 Matches
Win Percentage
Last 12 Months
Last 12 Months
65.8%25 / 38 Matches
56.3%27 / 48 Matches
Data Point
Stefan Kozlov
James Duckworth
Main Hand
Right-handed
Right-handed
Age
28
34
Birthday
February 1, 1998
January 21, 1992
Height
1.83m
1.83m
Weight
79kg
82kg
Win Percentage (Hard Courts)
2026 Calendar Year
Last 12 Months
Data Point
Stefan Kozlov
James Duckworth
Match Wins
55%
30%
Match Wins (3 Sets)
55%
30%
Match Wins (5 Sets)
N/A
50%
Wins in Straight Sets
30%
20%
Wins From Behind
10%
13%
Won At Least 1 Set
75%
50%
Set 1 Win
50%
40%
Set 2 Win
55%
30%
Set 3 Win
56%
33%
Set 4 Win
N/A
100%
Set 5 Win
N/A
100%
Data Point
Stefan Kozlov
James Duckworth
Match Wins
66%
56%
Match Wins (3 Sets)
66%
56%
Match Wins (5 Sets)
N/A
50%
Wins in Straight Sets
34%
44%
Wins From Behind
24%
13%
Won At Least 1 Set
84%
73%
Set 1 Win
58%
60%
Set 2 Win
61%
56%
Set 3 Win
63%
40%
Set 4 Win
N/A
100%
Set 5 Win
N/A
50%
Aces (Hard Courts)
2026 Calendar Year
Last 12 Months
Milestones
Over
Under
Data Point
Stefan Kozlov
James Duckworth
Match Total
Aces Per Match
3.45
8.90
12.35
Most Aces in a match
35%
40%
N/A
1+
90%
100%
100%
2+
65%
100%
100%
3+
50%
100%
100%
4+
45%
100%
100%
5+
40%
90%
90%
6+
15%
60%
83%
7+
15%
60%
75%
8+
5%
40%
60%
9+
5%
40%
55%
10+
5%
40%
53%
15+
0%
10%
25%
20+
0%
10%
20%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Over 0.5
90%
100%
100%
Over 1.5
65%
100%
100%
Over 2.5
50%
100%
100%
Over 3.5
45%
100%
100%
Over 4.5
40%
90%
90%
Over 5.5
25%
60%
83%
Over 6.5
15%
60%
75%
Over 7.5
5%
40%
60%
Over 8.5
5%
40%
55%
Over 9.5
5%
40%
53%
Over 10.5
0%
30%
53%
Over 11.5
0%
20%
50%
Over 12.5
0%
20%
48%
Over 13.5
0%
20%
38%
Over 14.5
0%
10%
25%
Over 15.5
0%
10%
25%
Over 16.5
0%
10%
25%
Over 17.5
0%
10%
25%
Over 18.5
0%
10%
20%
Over 19.5
0%
10%
20%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Under 0.5
10%
0%
0%
Under 1.5
35%
0%
0%
Under 2.5
50%
0%
0%
Under 3.5
55%
0%
0%
Under 4.5
60%
10%
10%
Under 5.5
75%
40%
18%
Under 6.5
85%
40%
25%
Under 7.5
95%
60%
40%
Under 8.5
95%
60%
45%
Under 9.5
95%
60%
48%
Under 10.5
100%
70%
48%
Under 11.5
100%
80%
50%
Under 12.5
100%
80%
53%
Under 13.5
100%
80%
63%
Under 14.5
100%
90%
75%
Milestones
Over
Under
Data Point
Stefan Kozlov
James Duckworth
Match Total
Aces Per Match
3.21
7.6
10.81
Most Aces in a match
26%
52%
N/A
1+
91%
100%
99%
2+
67%
100%
99%
3+
48%
98%
99%
4+
39%
94%
97%
5+
33%
81%
90%
6+
12%
48%
82%
7+
12%
48%
78%
8+
3%
40%
59%
9+
3%
33%
47%
10+
3%
23%
44%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Over 0.5
91%
100%
99%
Over 1.5
67%
100%
99%
Over 2.5
48%
98%
99%
Over 3.5
39%
94%
97%
Over 4.5
33%
81%
90%
Over 5.5
21%
63%
82%
Over 6.5
12%
48%
78%
Over 7.5
3%
40%
59%
Over 8.5
3%
33%
47%
Over 9.5
3%
23%
44%
Over 10.5
0%
17%
39%
Over 11.5
0%
13%
34%
Over 12.5
0%
8%
30%
Over 13.5
0%
8%
26%
Over 14.5
0%
6%
21%
Over 15.5
0%
6%
18%
Over 16.5
0%
6%
16%
Over 17.5
0%
4%
16%
Over 18.5
0%
4%
13%
Over 19.5
0%
4%
12%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Under 0.5
9%
0%
2%
Under 1.5
33%
0%
2%
Under 2.5
52%
2%
2%
Under 3.5
61%
6%
3%
Under 4.5
67%
19%
11%
Under 5.5
79%
38%
18%
Under 6.5
88%
52%
23%
Under 7.5
97%
60%
42%
Under 8.5
97%
67%
53%
Under 9.5
97%
77%
57%
Under 10.5
100%
83%
61%
Under 11.5
100%
88%
67%
Under 12.5
100%
92%
70%
Under 13.5
100%
92%
74%
Under 14.5
100%
94%
80%
Match Total Games (Hard Courts)
2026 Calendar Year
Last 12 Months
Total Games In A Set
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
James Duckworth
Average
Average Games in a Set
9.63
10.18
9.91
Over 6.5
96%
100%
98%
Over 7.5
85%
93%
89%
Over 8.5
65%
73%
69%
Over 9.5
46%
53%
50%
Over 10.5
27%
33%
30%
Over 11.5
27%
33%
30%
Over 12.5
19%
33%
26%
Data Point
Stefan Kozlov
James Duckworth
Average
Over 12.5
100%
100%
100%
Over 13.5
100%
100%
100%
Over 14.5
100%
93%
97%
Over 15.5
100%
93%
97%
Over 16.5
96%
93%
95%
Over 17.5
85%
73%
79%
Over 18.5
73%
53%
63%
Over 19.5
69%
47%
58%
Over 20.5
62%
47%
55%
Over 21.5
58%
33%
46%
Over 22.5
46%
33%
40%
Over 23.5
35%
33%
34%
Over 24.5
35%
33%
34%
Over 25.5
35%
33%
34%
Over 26.5
23%
27%
25%
Over 27.5
19%
20%
20%
Over 28.5
15%
20%
18%
Over 29.5
15%
20%
18%
Data Point
Stefan Kozlov
James Duckworth
Average
Over 18.5
N/A
100%
50%
Over 19.5
N/A
100%
50%
Over 20.5
N/A
100%
50%
Over 21.5
N/A
100%
50%
Over 22.5
N/A
100%
50%
Over 23.5
N/A
100%
50%
Over 24.5
N/A
100%
50%
Over 25.5
N/A
50%
25%
Over 26.5
N/A
50%
25%
Over 27.5
N/A
50%
25%
Over 28.5
N/A
50%
25%
Over 29.5
N/A
50%
25%
Over 30.5
N/A
50%
25%
Over 31.5
N/A
50%
25%
Over 32.5
N/A
50%
25%
Over 33.5
N/A
50%
25%
Over 34.5
N/A
50%
25%
Over 35.5
N/A
50%
25%
Over 36.5
N/A
50%
25%
Over 37.5
N/A
50%
25%
Total Games In A Set
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
James Duckworth
Average
Average Games in a Set
9.37
10.01
9.69
Over 6.5
96%
100%
98%
Over 7.5
78%
94%
86%
Over 8.5
61%
80%
71%
Over 9.5
45%
48%
47%
Over 10.5
25%
32%
29%
Over 11.5
25%
32%
29%
Over 12.5
18%
25%
22%
Data Point
Stefan Kozlov
James Duckworth
Average
Over 12.5
98%
98%
98%
Over 13.5
96%
98%
97%
Over 14.5
94%
97%
96%
Over 15.5
92%
95%
94%
Over 16.5
90%
94%
92%
Over 17.5
84%
78%
81%
Over 18.5
76%
71%
74%
Over 19.5
75%
58%
67%
Over 20.5
65%
55%
60%
Over 21.5
59%
49%
54%
Over 22.5
53%
45%
49%
Over 23.5
43%
40%
42%
Over 24.5
43%
40%
42%
Over 25.5
35%
35%
35%
Over 26.5
29%
31%
30%
Over 27.5
25%
29%
27%
Over 28.5
22%
25%
24%
Over 29.5
16%
22%
19%
Data Point
Stefan Kozlov
James Duckworth
Average
Over 18.5
N/A
100%
50%
Over 19.5
N/A
100%
50%
Over 20.5
N/A
100%
50%
Over 21.5
N/A
100%
50%
Over 22.5
N/A
100%
50%
Over 23.5
N/A
100%
50%
Over 24.5
N/A
100%
50%
Over 25.5
N/A
67%
33%
Over 26.5
N/A
67%
33%
Over 27.5
N/A
67%
33%
Over 28.5
N/A
67%
33%
Over 29.5
N/A
67%
33%
Over 30.5
N/A
67%
33%
Over 31.5
N/A
67%
33%
Over 32.5
N/A
67%
33%
Over 33.5
N/A
67%
33%
Over 34.5
N/A
67%
33%
Over 35.5
N/A
67%
33%
Over 36.5
N/A
67%
33%
Over 37.5
N/A
67%
33%
Break Points Won (Hard Courts)
2026 Calendar Year
Last 12 Months
3 Set Matches
5 Set Matches
Breaks Per Set
Data Point
Stefan Kozlov
James Duckworth
Match Total
Breaks Per Match
2.55
1.9
4.45
Over 0.5
70%
50%
100%
Over 1.5
55%
20%
95%
Over 2.5
55%
20%
95%
Over 3.5
30%
0%
50%
Over 4.5
5%
0%
40%
Over 5.5
5%
0%
33%
Over 6.5
0%
0%
13%
Over 7.5
0%
0%
8%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Breaks Per Match
N/A
3.75
2.75
Over 0.5
N/A
50%
50%
Over 1.5
N/A
50%
50%
Over 2.5
N/A
50%
50%
Over 3.5
N/A
50%
50%
Over 4.5
N/A
0%
50%
Over 5.5
N/A
0%
25%
Over 6.5
N/A
0%
25%
Over 7.5
N/A
0%
25%
Over 8.5
N/A
0%
25%
Over 9.5
N/A
0%
25%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Average Break-Points Converted (Set 1)
0.9
1
1.9
Average Break-Points Converted (Set 2)
1.4
0.85
2.25
Average Break-Points Converted (Set 3)
0.72
0.5
1.22
will Break Serve %
19%
45%
N/A
will not Break Serve %
55%
42%
N/A
Over 0.5
55%
50%
93%
Over 1.5
20%
0%
65%
Over 2.5
0%
0%
28%
Over 3.5
0%
0%
5%
Over 4.5
0%
0%
0%
Over 5.5
0%
0%
0%
Over 6.5
0%
0%
0%
Over 7.5
0%
0%
0%
Breaks Per Set data uses Set 1 as a sample.
3 Set Matches
5 Set Matches
Breaks Per Set
Data Point
Stefan Kozlov
James Duckworth
Match Total
Breaks Per Match
2.97
2.11
5.08
Over 0.5
82%
81%
100%
Over 1.5
70%
67%
95%
Over 2.5
67%
58%
91%
Over 3.5
45%
15%
63%
Over 4.5
18%
4%
51%
Over 5.5
9%
0%
36%
Over 6.5
3%
0%
24%
Over 7.5
0%
0%
16%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Breaks Per Match
N/A
3.75
2.75
Over 0.5
N/A
50%
50%
Over 1.5
N/A
50%
50%
Over 2.5
N/A
50%
50%
Over 3.5
N/A
50%
50%
Over 4.5
N/A
0%
50%
Over 5.5
N/A
0%
33%
Over 6.5
N/A
0%
33%
Over 7.5
N/A
0%
16%
Over 8.5
N/A
0%
16%
Over 9.5
N/A
0%
16%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Average Break-Points Converted (Set 1)
1.12
0.86
2.04
Average Break-Points Converted (Set 2)
1.33
1.03
2.31
Average Break-Points Converted (Set 3)
1.09
0.73
1.75
will Break Serve %
36%
45%
N/A
will not Break Serve %
50%
27%
N/A
Over 0.5
67%
69%
96%
Over 1.5
36%
21%
63%
Over 2.5
6%
0%
33%
Over 3.5
0%
0%
10%
Breaks Per Set data uses Set 1 as a sample.
Double Faults (Hard Courts)
2026 Calendar Year
Last 12 Months
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
James Duckworth
Match Total
Double Faults Per Match
4.7
3.2
7.9
Over 0.5 (1+)
100%
70%
95%
Over 1.5 (2+)
80%
60%
90%
Over 2.5 (3+)
70%
40%
85%
Over 3.5 (4+)
70%
40%
83%
Over 4.5 (5+)
55%
30%
70%
Over 5.5 (6+)
40%
30%
60%
Over 6.5 (7+)
30%
20%
58%
Over 7.5 (8+)
15%
10%
43%
Over 8.5 (9+)
10%
10%
33%
Over 9.5 (10+)
0%
10%
20%
Over 10.5 (11+)
0%
0%
13%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Double Faults Per Match
N/A
4.5
N/A
Over 0.5 (1+)
N/A
100%
50%
Over 1.5 (2+)
N/A
100%
50%
Over 2.5 (3+)
N/A
100%
50%
Over 3.5 (4+)
N/A
100%
50%
Over 4.5 (5+)
N/A
50%
50%
Over 5.5 (6+)
N/A
0%
50%
Over 6.5 (7+)
N/A
0%
25%
Over 7.5 (8+)
N/A
0%
25%
Over 8.5 (9+)
N/A
0%
25%
Over 9.5 (10+)
N/A
0%
25%
Over 10.5 (11+)
N/A
0%
25%
Over 11.5 (12+)
0%
0%
N/A
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
James Duckworth
Match Total
Double Faults Per Match
3.52
2.52
6.04
Over 0.5 (1+)
91%
73%
97%
Over 1.5 (2+)
67%
60%
90%
Over 2.5 (3+)
58%
38%
80%
Over 3.5 (4+)
45%
31%
74%
Over 4.5 (5+)
33%
19%
63%
Over 5.5 (6+)
24%
13%
56%
Over 6.5 (7+)
18%
8%
51%
Over 7.5 (8+)
9%
6%
33%
Over 8.5 (9+)
6%
2%
22%
Over 9.5 (10+)
0%
2%
16%
Over 10.5 (11+)
0%
0%
7%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Double Faults Per Match
N/A
4.5
3.5
Over 0.5 (1+)
N/A
100%
50%
Over 1.5 (2+)
N/A
100%
50%
Over 2.5 (3+)
N/A
100%
50%
Over 3.5 (4+)
N/A
100%
50%
Over 4.5 (5+)
N/A
50%
50%
Over 5.5 (6+)
N/A
0%
50%
Over 6.5 (7+)
N/A
0%
25%
Over 7.5 (8+)
N/A
0%
25%
Over 8.5 (9+)
N/A
0%
25%
Over 9.5 (10+)
N/A
0%
25%
Over 10.5 (11+)
N/A
0%
25%
Tie Breaks (Hard Courts)
2026 Calendar Year
Last 12 Months
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
(Match)
(Match)
James Duckworth
(Match)
(Match)
Average
Tie Breaks Per Match
0.35
0.6
0.46
Over 0.5
15%
20%
18%
Over 1.5
0%
0%
0%
Over 2.5
0%
0%
0%
Under 0.5
85%
80%
83%
Under 1.5
100%
100%
100%
Under 2.5
100%
100%
100%
Data Point
Stefan Kozlov (Match)
James Duckworth (Match)
Average
Tie Breaks Per Match
N/A
0.5
N/A
Over 0.5
N/A
50%
25%
Over 1.5
N/A
0%
N/A
Over 2.5
N/A
0%
N/A
Under 0.5
N/A
50%
25%
Under 1.5
N/A
100%
50%
Under 2.5
N/A
100%
50%
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
(Match)
(Match)
James Duckworth
(Match)
(Match)
Average
Tie Breaks Per Match
0.37
0.5
0.44
Over 0.5
18%
21%
20%
Over 1.5
0%
0%
0%
Over 2.5
0%
0%
0%
Under 0.5
82%
79%
81%
Under 1.5
100%
100%
100%
Under 2.5
100%
100%
100%
Data Point
Stefan Kozlov (Match)
James Duckworth (Match)
Average
Tie Breaks Per Match
N/A
0.67
N/A
Over 0.5
N/A
67%
33%
Over 1.5
N/A
0%
N/A
Over 2.5
N/A
0%
N/A
Under 0.5
N/A
33%
16%
Under 1.5
N/A
100%
50%
Under 2.5
N/A
100%
50%
Net Points Won (Hard Courts)
2026 Calendar Year
Last 12 Months
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
James Duckworth
Match Total
Net Points Won Per Match
14.34
7.3
21.64
Over 4.5 (5+)
100%
80%
90%
Over 5.5 (6+)
95%
70%
83%
Over 6.5 (7+)
89%
70%
80%
Over 7.5 (8+)
84%
60%
72%
Over 8.5 (9+)
84%
50%
67%
Over 9.5 (10+)
79%
40%
60%
Over 10.5 (11+)
74%
30%
52%
Over 11.5 (12+)
58%
10%
34%
Over 14.5 (12+)
32%
0%
16%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Net Point Won Per Match
N/A
15.25
N/A
Over 4.5 (5+)
N/A
100%
50%
Over 5.5 (6+)
N/A
100%
50%
Over 6.5 (7+)
N/A
100%
50%
Over 7.5 (8+)
N/A
100%
50%
Over 8.5 (9+)
N/A
100%
50%
Over 9.5 (10+)
N/A
100%
50%
Over 10.5 (11+)
N/A
100%
50%
Over 11.5 (12+)
N/A
100%
50%
Over 14.5 (15+)
N/A
50%
25%
Over 19.5 (20+)
N/A
50%
N/A
Over 22.5 (23+)
N/A
50%
25%
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
James Duckworth
Match Total
Net Points Won Per Match
14.28
7.85
22.13
Over 4.5 (5+)
100%
80%
90%
Over 5.5 (6+)
96%
77%
87%
Over 6.5 (7+)
91%
63%
77%
Over 7.5 (8+)
87%
57%
72%
Over 8.5 (9+)
83%
47%
65%
Over 9.5 (10+)
78%
40%
59%
Over 10.5 (11+)
74%
33%
54%
Over 11.5 (12+)
61%
27%
44%
Over 14.5 (15+)
35%
13%
24%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Net Points won Per Match
N/A
15.25
14.25
Over 4.5 (5+)
N/A
100%
50%
Over 5.5 (6+)
N/A
100%
50%
Over 6.5 (7+)
N/A
100%
50%
Over 7.5 (8+)
N/A
100%
50%
Over 8.5 (9+)
N/A
100%
50%
Over 9.5 (10+)
N/A
100%
50%
Over 10.5 (11+)
N/A
100%
50%
Over 11.5 (12+)
N/A
100%
50%
Over 14.5 (15+)
N/A
50%
25%
Over 19.5 (20+)
N/A
50%
25%
Over 22.5 (23+)
N/A
50%
25%
Head-to-Head (Clay Courts)
Performance
Profile
Data Point
Stefan Kozlov
James Duckworth
Wins
H2H
H2H
0(0%)
0(0%)
Sets Won
H2H
H2H
0(0%)
0(0%)
Win Percentage
2026 Calendar Year
2026 Calendar Year
50.0%3 / 6 Matches
80.0%4 / 5 Matches
Win Percentage
Last 12 Months
Last 12 Months
58.3%7 / 12 Matches
57.1%4 / 7 Matches
Data Point
Stefan Kozlov
James Duckworth
Main Hand
Right-handed
Right-handed
Age
28
34
Birthday
February 1, 1998
January 21, 1992
Height
1.83m
1.83m
Weight
79kg
82kg
Win Percentage (Clay Courts)
2026 Calendar Year
Last 12 Months
Data Point
Stefan Kozlov
James Duckworth
Match Wins
50%
80%
Match Wins (3 Sets)
50%
80%
Match Wins (5 Sets)
N/A
N/A
Wins in Straight Sets
33%
60%
Wins From Behind
0%
50%
Won At Least 1 Set
67%
80%
Set 1 Win
50%
60%
Set 2 Win
50%
80%
Set 3 Win
50%
100%
Set 4 Win
N/A
N/A
Set 5 Win
N/A
N/A
Data Point
Stefan Kozlov
James Duckworth
Match Wins
58%
57%
Match Wins (3 Sets)
58%
57%
Match Wins (5 Sets)
N/A
N/A
Wins in Straight Sets
42%
43%
Wins From Behind
0%
25%
Won At Least 1 Set
75%
57%
Set 1 Win
67%
43%
Set 2 Win
50%
57%
Set 3 Win
50%
50%
Set 4 Win
N/A
N/A
Set 5 Win
N/A
50%
Aces (Clay Courts)
2026 Calendar Year
Last 12 Months
Milestones
Over
Under
Data Point
Stefan Kozlov
James Duckworth
Match Total
Aces Per Match
1.33
6.80
8.13
Most Aces in a match
0%
60%
N/A
1+
67%
100%
92%
2+
33%
100%
84%
3+
17%
100%
84%
4+
17%
60%
84%
5+
0%
60%
59%
6+
0%
40%
49%
7+
0%
40%
39%
8+
0%
40%
39%
9+
0%
40%
39%
10+
0%
20%
39%
15+
0%
0%
20%
20+
0%
0%
10%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Over 0.5
67%
100%
92%
Over 1.5
33%
100%
84%
Over 2.5
17%
100%
84%
Over 3.5
17%
60%
84%
Over 4.5
0%
60%
59%
Over 5.5
0%
60%
49%
Over 6.5
0%
40%
39%
Over 7.5
0%
40%
39%
Over 8.5
0%
40%
39%
Over 9.5
0%
20%
39%
Over 10.5
0%
20%
29%
Over 11.5
0%
20%
20%
Over 12.5
0%
20%
20%
Over 13.5
0%
0%
20%
Over 14.5
0%
0%
20%
Over 15.5
0%
0%
20%
Over 16.5
0%
0%
20%
Over 17.5
0%
0%
20%
Over 18.5
0%
0%
10%
Over 19.5
0%
0%
10%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Under 0.5
33%
0%
9%
Under 1.5
67%
0%
17%
Under 2.5
83%
0%
17%
Under 3.5
83%
40%
17%
Under 4.5
100%
40%
42%
Under 5.5
100%
40%
52%
Under 6.5
100%
60%
62%
Under 7.5
100%
60%
62%
Under 8.5
100%
60%
62%
Under 9.5
100%
80%
62%
Under 10.5
100%
80%
72%
Under 11.5
100%
80%
80%
Under 12.5
100%
80%
80%
Under 13.5
100%
100%
80%
Under 14.5
100%
100%
80%
Milestones
Over
Under
Data Point
Stefan Kozlov
James Duckworth
Match Total
Aces Per Match
1.5
5.57
7.07
Most Aces in a match
26%
52%
N/A
1+
75%
100%
96%
2+
42%
100%
92%
3+
25%
86%
84%
4+
8%
43%
75%
5+
0%
43%
59%
6+
0%
29%
44%
7+
0%
29%
37%
8+
0%
29%
37%
9+
0%
29%
33%
10+
0%
14%
33%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Over 0.5
75%
100%
96%
Over 1.5
42%
100%
92%
Over 2.5
25%
86%
84%
Over 3.5
8%
43%
75%
Over 4.5
0%
43%
59%
Over 5.5
0%
43%
44%
Over 6.5
0%
29%
37%
Over 7.5
0%
29%
37%
Over 8.5
0%
29%
33%
Over 9.5
0%
14%
33%
Over 10.5
0%
14%
26%
Over 11.5
0%
14%
22%
Over 12.5
0%
14%
22%
Over 13.5
0%
0%
22%
Over 14.5
0%
0%
22%
Over 15.5
0%
0%
22%
Over 16.5
0%
0%
22%
Over 17.5
0%
0%
22%
Over 18.5
0%
0%
7%
Over 19.5
0%
0%
7%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Under 0.5
25%
0%
4%
Under 1.5
58%
0%
9%
Under 2.5
75%
14%
17%
Under 3.5
92%
57%
25%
Under 4.5
100%
57%
42%
Under 5.5
100%
57%
56%
Under 6.5
100%
71%
63%
Under 7.5
100%
71%
63%
Under 8.5
100%
71%
68%
Under 9.5
100%
86%
68%
Under 10.5
100%
86%
75%
Under 11.5
100%
86%
79%
Under 12.5
100%
86%
79%
Under 13.5
100%
100%
79%
Under 14.5
100%
100%
79%
Match Total Games (Clay Courts)
2026 Calendar Year
Last 12 Months
Total Games In A Set
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
James Duckworth
Average
Average Games in a Set
9.63
10.18
9.91
Over 6.5
96%
100%
98%
Over 7.5
85%
93%
89%
Over 8.5
65%
73%
69%
Over 9.5
46%
53%
50%
Over 10.5
27%
33%
30%
Over 11.5
27%
33%
30%
Over 12.5
19%
33%
26%
Data Point
Stefan Kozlov
James Duckworth
Average
Over 12.5
100%
100%
100%
Over 13.5
100%
100%
100%
Over 14.5
100%
93%
97%
Over 15.5
100%
93%
97%
Over 16.5
96%
93%
95%
Over 17.5
85%
73%
79%
Over 18.5
73%
53%
63%
Over 19.5
69%
47%
58%
Over 20.5
62%
47%
55%
Over 21.5
58%
33%
46%
Over 22.5
46%
33%
40%
Over 23.5
35%
33%
34%
Over 24.5
35%
33%
34%
Over 25.5
35%
33%
34%
Over 26.5
23%
27%
25%
Over 27.5
19%
20%
20%
Over 28.5
15%
20%
18%
Over 29.5
15%
20%
18%
Data Point
Stefan Kozlov
James Duckworth
Average
Over 18.5
N/A
100%
50%
Over 19.5
N/A
100%
50%
Over 20.5
N/A
100%
50%
Over 21.5
N/A
100%
50%
Over 22.5
N/A
100%
50%
Over 23.5
N/A
100%
50%
Over 24.5
N/A
100%
50%
Over 25.5
N/A
50%
25%
Over 26.5
N/A
50%
25%
Over 27.5
N/A
50%
25%
Over 28.5
N/A
50%
25%
Over 29.5
N/A
50%
25%
Over 30.5
N/A
50%
25%
Over 31.5
N/A
50%
25%
Over 32.5
N/A
50%
25%
Over 33.5
N/A
50%
25%
Over 34.5
N/A
50%
25%
Over 35.5
N/A
50%
25%
Over 36.5
N/A
50%
25%
Over 37.5
N/A
50%
25%
Total Games In A Set
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
James Duckworth
Average
Average Games in a Set
9.37
10.01
9.69
Over 6.5
96%
100%
98%
Over 7.5
78%
94%
86%
Over 8.5
61%
80%
71%
Over 9.5
45%
48%
47%
Over 10.5
25%
32%
29%
Over 11.5
25%
32%
29%
Over 12.5
18%
25%
22%
Data Point
Stefan Kozlov
James Duckworth
Average
Over 12.5
98%
98%
98%
Over 13.5
96%
98%
97%
Over 14.5
94%
97%
96%
Over 15.5
92%
95%
94%
Over 16.5
90%
94%
92%
Over 17.5
84%
78%
81%
Over 18.5
76%
71%
74%
Over 19.5
75%
58%
67%
Over 20.5
65%
55%
60%
Over 21.5
59%
49%
54%
Over 22.5
53%
45%
49%
Over 23.5
43%
40%
42%
Over 24.5
43%
40%
42%
Over 25.5
35%
35%
35%
Over 26.5
29%
31%
30%
Over 27.5
25%
29%
27%
Over 28.5
22%
25%
24%
Over 29.5
16%
22%
19%
Data Point
Stefan Kozlov
James Duckworth
Average
Over 18.5
N/A
100%
50%
Over 19.5
N/A
100%
50%
Over 20.5
N/A
100%
50%
Over 21.5
N/A
100%
50%
Over 22.5
N/A
100%
50%
Over 23.5
N/A
100%
50%
Over 24.5
N/A
100%
50%
Over 25.5
N/A
67%
33%
Over 26.5
N/A
67%
33%
Over 27.5
N/A
67%
33%
Over 28.5
N/A
67%
33%
Over 29.5
N/A
67%
33%
Over 30.5
N/A
67%
33%
Over 31.5
N/A
67%
33%
Over 32.5
N/A
67%
33%
Over 33.5
N/A
67%
33%
Over 34.5
N/A
67%
33%
Over 35.5
N/A
67%
33%
Over 36.5
N/A
67%
33%
Over 37.5
N/A
67%
33%
Break Points Won (Clay Courts)
2026 Calendar Year
Last 12 Months
3 Set Matches
5 Set Matches
Breaks Per Set
Data Point
Stefan Kozlov
James Duckworth
Match Total
Breaks Per Match
8.5
10
18.5
Over 0.5
100%
100%
100%
Over 1.5
100%
100%
100%
Over 2.5
100%
100%
100%
Over 3.5
100%
100%
100%
Over 4.5
100%
100%
100%
Over 5.5
17%
100%
100%
Over 6.5
17%
100%
100%
Over 7.5
17%
100%
100%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Breaks Per Match
N/A
N/A
N/A
Over 0.5
N/A
N/A
50%
Over 1.5
N/A
N/A
50%
Over 2.5
N/A
N/A
50%
Over 3.5
N/A
N/A
50%
Over 4.5
N/A
N/A
50%
Over 5.5
N/A
N/A
25%
Over 6.5
N/A
N/A
25%
Over 7.5
N/A
N/A
25%
Over 8.5
N/A
N/A
25%
Over 9.5
N/A
N/A
25%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Average Break-Points Converted (Set 1)
4
6
10
Average Break-Points Converted (Set 2)
4.5
4
8.5
Average Break-Points Converted (Set 3)
3
6
9
will Break Serve %
33%
50%
N/A
will not Break Serve %
67%
50%
N/A
Over 0.5
100%
100%
100%
Over 1.5
100%
100%
100%
Over 2.5
17%
100%
100%
Over 3.5
17%
100%
100%
Over 4.5
17%
100%
100%
Over 5.5
17%
100%
100%
Over 6.5
0%
0%
100%
Over 7.5
0%
0%
100%
Breaks Per Set data uses Set 1 as a sample.
3 Set Matches
5 Set Matches
Breaks Per Set
Data Point
Stefan Kozlov
James Duckworth
Match Total
Breaks Per Match
2.54
1.57
4.11
Over 0.5
100%
86%
100%
Over 1.5
100%
0%
100%
Over 2.5
100%
0%
100%
Over 3.5
33%
0%
32%
Over 4.5
25%
0%
17%
Over 5.5
8%
0%
13%
Over 6.5
0%
0%
13%
Over 7.5
0%
0%
13%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Breaks Per Match
N/A
N/A
N/A
Over 0.5
N/A
N/A
50%
Over 1.5
N/A
N/A
50%
Over 2.5
N/A
N/A
50%
Over 3.5
N/A
N/A
50%
Over 4.5
N/A
N/A
50%
Over 5.5
N/A
N/A
33%
Over 6.5
N/A
N/A
33%
Over 7.5
N/A
N/A
16%
Over 8.5
N/A
N/A
16%
Over 9.5
N/A
N/A
16%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Average Break-Points Converted (Set 1)
1.33
1
2.04
Average Break-Points Converted (Set 2)
1
0.5
2.31
Average Break-Points Converted (Set 3)
1.88
1
1.75
will Break Serve %
74%
28%
N/A
will not Break Serve %
12%
95%
N/A
Over 0.5
100%
86%
96%
Over 1.5
92%
0%
63%
Over 2.5
17%
0%
33%
Over 3.5
0%
0%
10%
Breaks Per Set data uses Set 1 as a sample.
Double Faults (Clay Courts)
2026 Calendar Year
Last 12 Months
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
James Duckworth
Match Total
Double Faults Per Match
1.5
4.6
6.1
Over 0.5 (1+)
67%
100%
100%
Over 1.5 (2+)
50%
80%
100%
Over 2.5 (3+)
33%
80%
100%
Over 3.5 (4+)
0%
80%
100%
Over 4.5 (5+)
0%
60%
92%
Over 5.5 (6+)
0%
40%
75%
Over 6.5 (7+)
0%
20%
67%
Over 7.5 (8+)
0%
0%
67%
Over 8.5 (9+)
0%
0%
30%
Over 9.5 (10+)
0%
0%
30%
Over 10.5 (11+)
0%
0%
30%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Double Faults Per Match
N/A
N/A
N/A
Over 0.5 (1+)
N/A
N/A
N/A
Over 1.5 (2+)
N/A
N/A
N/A
Over 2.5 (3+)
N/A
N/A
N/A
Over 3.5 (4+)
N/A
N/A
N/A
Over 4.5 (5+)
N/A
N/A
N/A
Over 5.5 (6+)
N/A
N/A
N/A
Over 6.5 (7+)
N/A
N/A
N/A
Over 7.5 (8+)
N/A
N/A
N/A
Over 8.5 (9+)
N/A
N/A
N/A
Over 9.5 (10+)
N/A
N/A
N/A
Over 10.5 (11+)
N/A
N/A
N/A
Over 11.5 (12+)
0%
0%
N/A
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
James Duckworth
Match Total
Double Faults Per Match
1.67
4.29
5.96
Over 0.5 (1+)
75%
100%
100%
Over 1.5 (2+)
58%
86%
96%
Over 2.5 (3+)
33%
71%
96%
Over 3.5 (4+)
0%
71%
92%
Over 4.5 (5+)
0%
57%
88%
Over 5.5 (6+)
0%
29%
71%
Over 6.5 (7+)
0%
14%
67%
Over 7.5 (8+)
0%
0%
60%
Over 8.5 (9+)
0%
0%
37%
Over 9.5 (10+)
0%
0%
33%
Over 10.5 (11+)
0%
0%
29%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Double Faults Per Match
N/A
N/A
N/A
Over 0.5 (1+)
N/A
N/A
N/A
Over 1.5 (2+)
N/A
N/A
N/A
Over 2.5 (3+)
N/A
N/A
N/A
Over 3.5 (4+)
N/A
N/A
N/A
Over 4.5 (5+)
N/A
N/A
N/A
Over 5.5 (6+)
N/A
N/A
N/A
Over 6.5 (7+)
N/A
N/A
N/A
Over 7.5 (8+)
N/A
N/A
N/A
Over 8.5 (9+)
N/A
N/A
N/A
Over 9.5 (10+)
N/A
N/A
N/A
Over 10.5 (11+)
N/A
N/A
N/A
Tie Breaks (Clay Courts)
2026 Calendar Year
Last 12 Months
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
(Match)
(Match)
James Duckworth
(Match)
(Match)
Average
Tie Breaks Per Match
0.5
0.4
0.46
Over 0.5
17%
20%
19%
Over 1.5
0%
0%
0%
Over 2.5
0%
0%
0%
Under 0.5
83%
80%
82%
Under 1.5
100%
100%
100%
Under 2.5
100%
100%
100%
Data Point
Stefan Kozlov (Match)
James Duckworth (Match)
Average
Tie Breaks Per Match
N/A
0.5
N/A
Over 0.5
N/A
50%
25%
Over 1.5
N/A
0%
N/A
Over 2.5
N/A
0%
N/A
Under 0.5
N/A
50%
25%
Under 1.5
N/A
100%
50%
Under 2.5
N/A
100%
50%
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
(Match)
(Match)
James Duckworth
(Match)
(Match)
Average
Tie Breaks Per Match
0.25
0.43
0.44
Over 0.5
8%
14%
11%
Over 1.5
0%
0%
0%
Over 2.5
0%
0%
0%
Under 0.5
92%
86%
89%
Under 1.5
100%
100%
100%
Under 2.5
100%
100%
100%
Data Point
Stefan Kozlov (Match)
James Duckworth (Match)
Average
Tie Breaks Per Match
N/A
0.67
N/A
Over 0.5
N/A
67%
33%
Over 1.5
N/A
0%
N/A
Over 2.5
N/A
0%
N/A
Under 0.5
N/A
33%
16%
Under 1.5
N/A
100%
50%
Under 2.5
N/A
100%
50%
Net Points Won (Clay Courts)
2026 Calendar Year
Last 12 Months
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
James Duckworth
Match Total
Net Points Won Per Match
13.83
6.9
20.73
Over 4.5 (5+)
83%
80%
82%
Over 5.5 (6+)
83%
80%
82%
Over 6.5 (7+)
83%
80%
82%
Over 7.5 (8+)
83%
60%
72%
Over 8.5 (9+)
67%
40%
54%
Over 9.5 (10+)
67%
40%
54%
Over 10.5 (11+)
67%
40%
54%
Over 11.5 (12+)
50%
20%
35%
Over 14.5 (12+)
33%
20%
27%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Net Point Won Per Match
N/A
N/A
N/A
Over 4.5 (5+)
N/A
N/A
N/A
Over 5.5 (6+)
N/A
N/A
N/A
Over 6.5 (7+)
N/A
N/A
N/A
Over 7.5 (8+)
N/A
N/A
N/A
Over 8.5 (9+)
N/A
N/A
N/A
Over 9.5 (10+)
N/A
N/A
N/A
Over 10.5 (11+)
N/A
N/A
N/A
Over 11.5 (12+)
N/A
N/A
N/A
Over 14.5 (15+)
N/A
N/A
N/A
Over 19.5 (20+)
N/A
N/A
N/A
Over 22.5 (23+)
N/A
N/A
N/A
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
James Duckworth
Match Total
Net Points Won Per Match
14.06
8.21
22.27
Over 4.5 (5+)
89%
71%
80%
Over 5.5 (6+)
89%
71%
80%
Over 6.5 (7+)
89%
71%
80%
Over 7.5 (8+)
89%
57%
73%
Over 8.5 (9+)
78%
43%
61%
Over 9.5 (10+)
67%
43%
55%
Over 10.5 (11+)
56%
43%
50%
Over 11.5 (12+)
33%
29%
31%
Over 14.5 (15+)
22%
29%
26%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Net Points won Per Match
N/A
N/A
N/A
Over 4.5 (5+)
N/A
N/A
N/A
Over 5.5 (6+)
N/A
N/A
N/A
Over 6.5 (7+)
N/A
N/A
N/A
Over 7.5 (8+)
N/A
N/A
N/A
Over 8.5 (9+)
N/A
N/A
N/A
Over 9.5 (10+)
N/A
N/A
N/A
Over 10.5 (11+)
N/A
N/A
N/A
Over 11.5 (12+)
N/A
N/A
N/A
Over 14.5 (15+)
N/A
N/A
N/A
Over 19.5 (20+)
N/A
N/A
N/A
Over 22.5 (23+)
N/A
N/A
N/A
Head-to-Head (Grass Courts)
Performance
Profile
Data Point
Stefan Kozlov
James Duckworth
Wins
H2H
H2H
0(0%)
0(0%)
Sets Won
H2H
H2H
0(0%)
0(0%)
Win Percentage
2026 Calendar Year
2026 Calendar Year
N/A0 / 0 Matches
N/A0 / 0 Matches
Win Percentage
Last 12 Months
Last 12 Months
0.0%0 / 1 Matches
50.0%5 / 10 Matches
Data Point
Stefan Kozlov
James Duckworth
Main Hand
Right-handed
Right-handed
Age
28
34
Birthday
February 1, 1998
January 21, 1992
Height
1.83m
1.83m
Weight
79kg
82kg
Win Percentage (Grass Courts)
2026 Calendar Year
Last 12 Months
Data Point
Stefan Kozlov
James Duckworth
Match Wins
N/A
N/A
Match Wins (3 Sets)
N/A
N/A
Match Wins (5 Sets)
N/A
N/A
Wins in Straight Sets
N/A
N/A
Wins From Behind
N/A
N/A
Won At Least 1 Set
N/A
N/A
Set 1 Win
N/A
N/A
Set 2 Win
N/A
N/A
Set 3 Win
N/A
N/A
Set 4 Win
N/A
N/A
Set 5 Win
N/A
N/A
Data Point
Stefan Kozlov
James Duckworth
Match Wins
0%
50%
Match Wins (3 Sets)
0%
50%
Match Wins (5 Sets)
N/A
0%
Wins in Straight Sets
0%
20%
Wins From Behind
0%
17%
Won At Least 1 Set
100%
70%
Set 1 Win
0%
60%
Set 2 Win
100%
30%
Set 3 Win
0%
60%
Set 4 Win
N/A
0%
Set 5 Win
N/A
50%
Aces (Grass Courts)
2026 Calendar Year
Last 12 Months
Milestones
Over
Under
Data Point
Stefan Kozlov
James Duckworth
Match Total
Aces Per Match
N/A
N/A
N/A
Most Aces in a match
N/A
N/A
N/A
1+
N/A
N/A
N/A
2+
N/A
N/A
N/A
3+
N/A
N/A
N/A
4+
N/A
N/A
N/A
5+
N/A
N/A
N/A
6+
N/A
N/A
N/A
7+
N/A
N/A
N/A
8+
N/A
N/A
N/A
9+
N/A
N/A
N/A
10+
N/A
N/A
N/A
15+
N/A
N/A
N/A
20+
N/A
N/A
N/A
Data Point
Stefan Kozlov
James Duckworth
Match Total
Over 0.5
N/A
N/A
N/A
Over 1.5
N/A
N/A
N/A
Over 2.5
N/A
N/A
N/A
Over 3.5
N/A
N/A
N/A
Over 4.5
N/A
N/A
N/A
Over 5.5
N/A
N/A
N/A
Over 6.5
N/A
N/A
N/A
Over 7.5
N/A
N/A
N/A
Over 8.5
N/A
N/A
N/A
Over 9.5
N/A
N/A
N/A
Over 10.5
N/A
N/A
N/A
Over 11.5
N/A
N/A
N/A
Over 12.5
N/A
N/A
N/A
Over 13.5
N/A
N/A
N/A
Over 14.5
N/A
N/A
N/A
Over 15.5
N/A
N/A
N/A
Over 16.5
N/A
N/A
N/A
Over 17.5
N/A
N/A
N/A
Over 18.5
N/A
N/A
N/A
Over 19.5
N/A
N/A
N/A
Data Point
Stefan Kozlov
James Duckworth
Match Total
Under 0.5
N/A
N/A
N/A
Under 1.5
N/A
N/A
N/A
Under 2.5
N/A
N/A
N/A
Under 3.5
N/A
N/A
N/A
Under 4.5
N/A
N/A
N/A
Under 5.5
N/A
N/A
N/A
Under 6.5
N/A
N/A
N/A
Under 7.5
N/A
N/A
N/A
Under 8.5
N/A
N/A
N/A
Under 9.5
N/A
N/A
N/A
Under 10.5
N/A
N/A
N/A
Under 11.5
N/A
N/A
N/A
Under 12.5
N/A
N/A
N/A
Under 13.5
N/A
N/A
N/A
Under 14.5
N/A
N/A
N/A
Milestones
Over
Under
Data Point
Stefan Kozlov
James Duckworth
Match Total
Aces Per Match
0
8.9
N/A
Most Aces in a match
26%
52%
N/A
1+
0%
100%
100%
2+
0%
100%
100%
3+
0%
100%
100%
4+
0%
90%
100%
5+
0%
80%
45%
6+
0%
60%
45%
7+
0%
60%
45%
8+
0%
50%
45%
9+
0%
50%
45%
10+
0%
40%
45%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Over 0.5
0%
100%
100%
Over 1.5
0%
100%
100%
Over 2.5
0%
100%
100%
Over 3.5
0%
90%
100%
Over 4.5
0%
80%
45%
Over 5.5
0%
80%
45%
Over 6.5
0%
60%
45%
Over 7.5
0%
50%
45%
Over 8.5
0%
50%
45%
Over 9.5
0%
40%
45%
Over 10.5
0%
20%
45%
Over 11.5
0%
20%
40%
Over 12.5
0%
20%
40%
Over 13.5
0%
20%
30%
Over 14.5
0%
20%
30%
Over 15.5
0%
20%
25%
Over 16.5
0%
10%
20%
Over 17.5
0%
10%
15%
Over 18.5
0%
0%
15%
Over 19.5
0%
0%
15%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Under 0.5
100%
0%
0%
Under 1.5
100%
0%
0%
Under 2.5
100%
0%
0%
Under 3.5
100%
10%
0%
Under 4.5
100%
20%
55%
Under 5.5
100%
20%
55%
Under 6.5
100%
40%
55%
Under 7.5
100%
50%
55%
Under 8.5
100%
50%
55%
Under 9.5
100%
60%
55%
Under 10.5
100%
80%
55%
Under 11.5
100%
80%
60%
Under 12.5
100%
80%
60%
Under 13.5
100%
80%
70%
Under 14.5
100%
80%
70%
Match Total Games (Grass Courts)
2026 Calendar Year
Last 12 Months
Total Games In A Set
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
James Duckworth
Average
Average Games in a Set
9.63
10.18
9.91
Over 6.5
96%
100%
98%
Over 7.5
85%
93%
89%
Over 8.5
65%
73%
69%
Over 9.5
46%
53%
50%
Over 10.5
27%
33%
30%
Over 11.5
27%
33%
30%
Over 12.5
19%
33%
26%
Data Point
Stefan Kozlov
James Duckworth
Average
Over 12.5
100%
100%
100%
Over 13.5
100%
100%
100%
Over 14.5
100%
93%
97%
Over 15.5
100%
93%
97%
Over 16.5
96%
93%
95%
Over 17.5
85%
73%
79%
Over 18.5
73%
53%
63%
Over 19.5
69%
47%
58%
Over 20.5
62%
47%
55%
Over 21.5
58%
33%
46%
Over 22.5
46%
33%
40%
Over 23.5
35%
33%
34%
Over 24.5
35%
33%
34%
Over 25.5
35%
33%
34%
Over 26.5
23%
27%
25%
Over 27.5
19%
20%
20%
Over 28.5
15%
20%
18%
Over 29.5
15%
20%
18%
Data Point
Stefan Kozlov
James Duckworth
Average
Over 18.5
N/A
100%
50%
Over 19.5
N/A
100%
50%
Over 20.5
N/A
100%
50%
Over 21.5
N/A
100%
50%
Over 22.5
N/A
100%
50%
Over 23.5
N/A
100%
50%
Over 24.5
N/A
100%
50%
Over 25.5
N/A
50%
25%
Over 26.5
N/A
50%
25%
Over 27.5
N/A
50%
25%
Over 28.5
N/A
50%
25%
Over 29.5
N/A
50%
25%
Over 30.5
N/A
50%
25%
Over 31.5
N/A
50%
25%
Over 32.5
N/A
50%
25%
Over 33.5
N/A
50%
25%
Over 34.5
N/A
50%
25%
Over 35.5
N/A
50%
25%
Over 36.5
N/A
50%
25%
Over 37.5
N/A
50%
25%
Total Games In A Set
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
James Duckworth
Average
Average Games in a Set
9.37
10.01
9.69
Over 6.5
96%
100%
98%
Over 7.5
78%
94%
86%
Over 8.5
61%
80%
71%
Over 9.5
45%
48%
47%
Over 10.5
25%
32%
29%
Over 11.5
25%
32%
29%
Over 12.5
18%
25%
22%
Data Point
Stefan Kozlov
James Duckworth
Average
Over 12.5
98%
98%
98%
Over 13.5
96%
98%
97%
Over 14.5
94%
97%
96%
Over 15.5
92%
95%
94%
Over 16.5
90%
94%
92%
Over 17.5
84%
78%
81%
Over 18.5
76%
71%
74%
Over 19.5
75%
58%
67%
Over 20.5
65%
55%
60%
Over 21.5
59%
49%
54%
Over 22.5
53%
45%
49%
Over 23.5
43%
40%
42%
Over 24.5
43%
40%
42%
Over 25.5
35%
35%
35%
Over 26.5
29%
31%
30%
Over 27.5
25%
29%
27%
Over 28.5
22%
25%
24%
Over 29.5
16%
22%
19%
Data Point
Stefan Kozlov
James Duckworth
Average
Over 18.5
N/A
100%
50%
Over 19.5
N/A
100%
50%
Over 20.5
N/A
100%
50%
Over 21.5
N/A
100%
50%
Over 22.5
N/A
100%
50%
Over 23.5
N/A
100%
50%
Over 24.5
N/A
100%
50%
Over 25.5
N/A
67%
33%
Over 26.5
N/A
67%
33%
Over 27.5
N/A
67%
33%
Over 28.5
N/A
67%
33%
Over 29.5
N/A
67%
33%
Over 30.5
N/A
67%
33%
Over 31.5
N/A
67%
33%
Over 32.5
N/A
67%
33%
Over 33.5
N/A
67%
33%
Over 34.5
N/A
67%
33%
Over 35.5
N/A
67%
33%
Over 36.5
N/A
67%
33%
Over 37.5
N/A
67%
33%
Break Points Won (Grass Courts)
2026 Calendar Year
Last 12 Months
3 Set Matches
5 Set Matches
Breaks Per Set
Data Point
Stefan Kozlov
James Duckworth
Match Total
Breaks Per Match
N/A
N/A
N/A
Over 0.5
N/A
N/A
N/A
Over 1.5
N/A
N/A
N/A
Over 2.5
N/A
N/A
N/A
Over 3.5
N/A
N/A
N/A
Over 4.5
N/A
N/A
N/A
Over 5.5
N/A
N/A
N/A
Over 6.5
N/A
N/A
N/A
Over 7.5
N/A
N/A
N/A
Data Point
Stefan Kozlov
James Duckworth
Match Total
Breaks Per Match
N/A
N/A
N/A
Over 0.5
N/A
N/A
50%
Over 1.5
N/A
N/A
50%
Over 2.5
N/A
N/A
50%
Over 3.5
N/A
N/A
50%
Over 4.5
N/A
N/A
50%
Over 5.5
N/A
N/A
25%
Over 6.5
N/A
N/A
25%
Over 7.5
N/A
N/A
25%
Over 8.5
N/A
N/A
25%
Over 9.5
N/A
N/A
25%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Average Break-Points Converted (Set 1)
N/A
N/A
N/A
Average Break-Points Converted (Set 2)
N/A
N/A
N/A
Average Break-Points Converted (Set 3)
N/A
N/A
N/A
will Break Serve %
N/A
N/A
N/A
will not Break Serve %
N/A
N/A
N/A
Over 0.5
N/A
N/A
N/A
Over 1.5
N/A
N/A
N/A
Over 2.5
N/A
N/A
N/A
Over 3.5
N/A
N/A
N/A
Over 4.5
N/A
N/A
N/A
Over 5.5
N/A
N/A
N/A
Over 6.5
N/A
N/A
N/A
Over 7.5
N/A
N/A
N/A
Breaks Per Set data uses Set 1 as a sample.
3 Set Matches
5 Set Matches
Breaks Per Set
Data Point
Stefan Kozlov
James Duckworth
Match Total
Breaks Per Match
2.5
2.05
4.55
Over 0.5
100%
100%
100%
Over 1.5
0%
60%
100%
Over 2.5
0%
30%
100%
Over 3.5
0%
10%
85%
Over 4.5
0%
0%
70%
Over 5.5
0%
0%
0%
Over 6.5
0%
0%
0%
Over 7.5
0%
0%
0%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Breaks Per Match
N/A
3.5
2.5
Over 0.5
N/A
100%
50%
Over 1.5
N/A
100%
50%
Over 2.5
N/A
0%
50%
Over 3.5
N/A
0%
50%
Over 4.5
N/A
0%
50%
Over 5.5
N/A
0%
33%
Over 6.5
N/A
0%
33%
Over 7.5
N/A
0%
16%
Over 8.5
N/A
0%
16%
Over 9.5
N/A
0%
16%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Average Break-Points Converted (Set 1)
1
0.95
2.04
Average Break-Points Converted (Set 2)
0.5
0.75
2.31
Average Break-Points Converted (Set 3)
1
0.7
1.75
will Break Serve %
0%
43%
N/A
will not Break Serve %
40%
46%
N/A
Over 0.5
0%
80%
96%
Over 1.5
0%
20%
63%
Over 2.5
0%
0%
33%
Over 3.5
0%
0%
10%
Breaks Per Set data uses Set 1 as a sample.
Double Faults (Grass Courts)
2026 Calendar Year
Last 12 Months
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
James Duckworth
Match Total
Double Faults Per Match
N/A
N/A
N/A
Over 0.5 (1+)
N/A
N/A
N/A
Over 1.5 (2+)
N/A
N/A
N/A
Over 2.5 (3+)
N/A
N/A
N/A
Over 3.5 (4+)
N/A
N/A
N/A
Over 4.5 (5+)
N/A
N/A
N/A
Over 5.5 (6+)
N/A
N/A
N/A
Over 6.5 (7+)
N/A
N/A
N/A
Over 7.5 (8+)
N/A
N/A
N/A
Over 8.5 (9+)
N/A
N/A
N/A
Over 9.5 (10+)
N/A
N/A
N/A
Over 10.5 (11+)
N/A
N/A
N/A
Data Point
Stefan Kozlov
James Duckworth
Match Total
Double Faults Per Match
N/A
N/A
N/A
Over 0.5 (1+)
N/A
N/A
N/A
Over 1.5 (2+)
N/A
N/A
N/A
Over 2.5 (3+)
N/A
N/A
N/A
Over 3.5 (4+)
N/A
N/A
N/A
Over 4.5 (5+)
N/A
N/A
N/A
Over 5.5 (6+)
N/A
N/A
N/A
Over 6.5 (7+)
N/A
N/A
N/A
Over 7.5 (8+)
N/A
N/A
N/A
Over 8.5 (9+)
N/A
N/A
N/A
Over 9.5 (10+)
N/A
N/A
N/A
Over 10.5 (11+)
N/A
N/A
N/A
Over 11.5 (12+)
0%
0%
N/A
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
James Duckworth
Match Total
Double Faults Per Match
1
2.8
3.8
Over 0.5 (1+)
100%
90%
100%
Over 1.5 (2+)
0%
70%
100%
Over 2.5 (3+)
0%
60%
45%
Over 3.5 (4+)
0%
20%
35%
Over 4.5 (5+)
0%
10%
30%
Over 5.5 (6+)
0%
10%
25%
Over 6.5 (7+)
0%
10%
10%
Over 7.5 (8+)
0%
10%
10%
Over 8.5 (9+)
0%
0%
5%
Over 9.5 (10+)
0%
0%
5%
Over 10.5 (11+)
0%
0%
0%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Double Faults Per Match
N/A
7
6
Over 0.5 (1+)
N/A
100%
50%
Over 1.5 (2+)
N/A
100%
50%
Over 2.5 (3+)
N/A
100%
50%
Over 3.5 (4+)
N/A
100%
50%
Over 4.5 (5+)
N/A
100%
50%
Over 5.5 (6+)
N/A
100%
50%
Over 6.5 (7+)
N/A
100%
50%
Over 7.5 (8+)
N/A
0%
50%
Over 8.5 (9+)
N/A
0%
50%
Over 9.5 (10+)
N/A
0%
50%
Over 10.5 (11+)
N/A
0%
50%
Tie Breaks (Grass Courts)
2026 Calendar Year
Last 12 Months
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
(Match)
(Match)
James Duckworth
(Match)
(Match)
Average
Tie Breaks Per Match
N/A
N/A
0.46
Over 0.5
N/A
N/A
N/A
Over 1.5
N/A
N/A
N/A
Over 2.5
N/A
N/A
N/A
Under 0.5
N/A
N/A
N/A
Under 1.5
N/A
N/A
N/A
Under 2.5
N/A
N/A
N/A
Data Point
Stefan Kozlov (Match)
James Duckworth (Match)
Average
Tie Breaks Per Match
N/A
0.5
N/A
Over 0.5
N/A
50%
25%
Over 1.5
N/A
0%
N/A
Over 2.5
N/A
0%
N/A
Under 0.5
N/A
50%
25%
Under 1.5
N/A
100%
50%
Under 2.5
N/A
100%
50%
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
(Match)
(Match)
James Duckworth
(Match)
(Match)
Average
Tie Breaks Per Match
0
0.8
0.44
Over 0.5
0%
30%
15%
Over 1.5
0%
0%
0%
Over 2.5
0%
0%
0%
Under 0.5
100%
70%
85%
Under 1.5
100%
100%
100%
Under 2.5
100%
100%
100%
Data Point
Stefan Kozlov (Match)
James Duckworth (Match)
Average
Tie Breaks Per Match
N/A
0.67
N/A
Over 0.5
N/A
67%
33%
Over 1.5
N/A
0%
N/A
Over 2.5
N/A
0%
N/A
Under 0.5
N/A
33%
16%
Under 1.5
N/A
100%
50%
Under 2.5
N/A
100%
50%
Net Points Won (Grass Courts)
2026 Calendar Year
Last 12 Months
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
James Duckworth
Match Total
Net Points Won Per Match
N/A
N/A
N/A
Over 4.5 (5+)
N/A
N/A
N/A
Over 5.5 (6+)
N/A
N/A
N/A
Over 6.5 (7+)
N/A
N/A
N/A
Over 7.5 (8+)
N/A
N/A
N/A
Over 8.5 (9+)
N/A
N/A
N/A
Over 9.5 (10+)
N/A
N/A
N/A
Over 10.5 (11+)
N/A
N/A
N/A
Over 11.5 (12+)
N/A
N/A
N/A
Over 14.5 (12+)
N/A
N/A
N/A
Data Point
Stefan Kozlov
James Duckworth
Match Total
Net Point Won Per Match
N/A
N/A
N/A
Over 4.5 (5+)
N/A
N/A
N/A
Over 5.5 (6+)
N/A
N/A
N/A
Over 6.5 (7+)
N/A
N/A
N/A
Over 7.5 (8+)
N/A
N/A
N/A
Over 8.5 (9+)
N/A
N/A
N/A
Over 9.5 (10+)
N/A
N/A
N/A
Over 10.5 (11+)
N/A
N/A
N/A
Over 11.5 (12+)
N/A
N/A
N/A
Over 14.5 (15+)
N/A
N/A
N/A
Over 19.5 (20+)
N/A
N/A
N/A
Over 22.5 (23+)
N/A
N/A
N/A
3 Set Matches
5 Set Matches
Data Point
Stefan Kozlov
James Duckworth
Match Total
Net Points Won Per Match
19
7.83
26.83
Over 4.5 (5+)
100%
78%
89%
Over 5.5 (6+)
100%
78%
89%
Over 6.5 (7+)
0%
56%
28%
Over 7.5 (8+)
0%
44%
22%
Over 8.5 (9+)
0%
33%
17%
Over 9.5 (10+)
0%
33%
17%
Over 10.5 (11+)
0%
33%
17%
Over 11.5 (12+)
0%
22%
11%
Over 14.5 (15+)
0%
0%
0%
Data Point
Stefan Kozlov
James Duckworth
Match Total
Net Points won Per Match
N/A
18.5
17.5
Over 4.5 (5+)
N/A
100%
50%
Over 5.5 (6+)
N/A
100%
50%
Over 6.5 (7+)
N/A
100%
50%
Over 7.5 (8+)
N/A
100%
50%
Over 8.5 (9+)
N/A
100%
50%
Over 9.5 (10+)
N/A
100%
50%
Over 10.5 (11+)
N/A
100%
50%
Over 11.5 (12+)
N/A
100%
50%
Over 14.5 (15+)
N/A
100%
50%
Over 19.5 (20+)
N/A
100%
50%
Over 22.5 (23+)
N/A
0%
N/A
Latest Results For Stefan Kozlov
Date
Tournament
Player
Opponent
Total Sets
Stefan Kozlov
12 - 12
Opponent
Total Wins
Stefan Kozlov
5 - 5
Opponent
Win Percentage
Stefan Kozlov
50% - 50%
Opponent
Latest Results For James Duckworth
Date
Tournament
Player
Opponent
Total Sets
James Duckworth
11 - 12
Opponent
Total Wins
James Duckworth
5 - 5
Opponent
Win Percentage
James Duckworth
50% - 50%
Opponent
Ranking
Elo
Ranking
Elo
Ranking
Elo