Jeff Wolf and Stefan Kozlov will square off in the quarter of the Cleveland Challenger for the 10th time in their career. They are scheduled to compete on Friday at 6:00 pm on STADIUM. In this post, we analyze their head to head performance and prediction.
Prediction, odds and live streaming
The pick for Tennis Tonic is Jeff Wolf who should win in 3 sets.
Jeff Wolf -> 1.69
Stefan Kozlov -> 2.07
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Prediction and head to head Jeff Wolf vs. Stefan Kozlov
This will be the 10th time that Jeff Wolf and Stefan Kozlov square off. The head to head is 5-4 for Kozlov (see full H2H stats), 3-2 on indoor hard courts.
The last time that they played, Kozlov won 6-4 6-4 in the quarter in the Bloomfield Hills Challenger back in 2024.
Jeff Wolf
| Year | Total | Hard | Clay | I.hard | Grass | Carpet |
|---|---|---|---|---|---|---|
| 2025 | 6-4 | 0-1 | 0-0 | 6-3 | 0-0 | 0-0 |
| 2024 | 17-26 | 11-16 | 6-9 | 0-1 | 0-0 | 0-0 |
| 2023 | 31-26 | 16-13 | 5-5 | 6-4 | 4-4 | 0-0 |
| 2022 | 43-29 | 23-15 | 8-4 | 12-10 | 0-0 | 0-0 |
| 2021 | 16-11 | 7-7 | 0-0 | 9-4 | 0-0 | 0-0 |
Ranked no. 258, Wolf reached the quarter after beating Jenson Brooksby 6-2 6-4 and Antoine Ghibaudo 7-6(11) 4-6 6-3.
In the 2nd round, Jeff defeated Ghibaudo (7-611 4-6 6-3). During the match, Wolf scored 121 points vs Ghibaudo’s 114. Jeff was exceptionally aggressive to blast 53 winners.
Regarding the service games, Wolf fired 8 aces and he committed only 3 double faults. Overall, Jeff Wolf was extremely efficient on serve to win 74% (53/72) of his 1st serve and 60% (25/42) on the second serve. However, this didn’t prevent his to concede the serve twice. Wolf broke Ghibaudo twice after converting 25% of his break points (2/8).
Overall Performance in this tournament
Wolf has lost 1 set in this tournament to win 54% of the points he played.
Wolf has winning win-loss record in the last 10 years having won 57% of his matches (185-139). 5-2 on indoor hard courts in 2025. Talking about his performance on the same surface of this competition, Wolf has an overall 68-38 record in the last years on indoor hard courts.
Wolf has a composed 5-2 win-loss record in 2025, 5-2 on indoor hard courts (See FULL STATS).
Previously in the Cleveland Challenger
Stefan Kozlov
| Year | Total | Hard | Clay | I.hard | Grass | Carpet |
|---|---|---|---|---|---|---|
| 2025 | 26-11 | 12-6 | 4-1 | 10-3 | 0-1 | 0-0 |
| 2024 | 37-19 | 16-9 | 17-8 | 4-2 | 0-0 | 0-0 |
| 2023 | 6-12 | 1-6 | 0-0 | 5-6 | 0-0 | 0-0 |
| 2022 | 21-34 | 14-18 | 0-5 | 4-5 | 3-6 | 0-0 |
| 2021 | 41-15 | 20-12 | 5-2 | 16-1 | 0-0 | 0-0 |
Ranked no. 354, Stefan got to the quarter after defeating Micah Braswell 4-6 6-3 6-4 and Kaylan Bigun 6-2 6-3.
In the 2nd round, Kozlov had a good straight sets win against Bigun (6-2 6-3). During the match Kozlov scored 68 points vs Bigun’s 47. The American was quite aggressive to blast 28 winners.
Talking about serving, Kozlov bagged 5 aces and he committed only 1 double fault for the entire match. Overall, Stefan Kozlov was very efficient on serve to win 72% (28/39) of his 1st serve and 53% (16/30) on the second serve. However, this didn’t prevent his to concede the serve once. The American broke Bigun 4 times after converting 67% of his break points (4/6).
Overall Performance in this tournament
Kozlov has conceded 1 set in the tournament to win 54% of the points he played.
Kozlov has a composed 4-1 win-loss record in 2025, 4-1 on indoor hard courts (See FULL STATS).
Previously in the Cleveland Challenger
Previously, his best result was reaching the quarter in 2023. See his history
.H2H Performance in the tournament (main draw)
Matches, sets, games and points
| Points | Wolf | Kozlov |
|---|---|---|
| Match played | 2 | 2 |
| Tot Set | 5 | 5 |
| Tot Games | 50 | 46 |
| Pts | 190-164 | 176-149 |
| Total Points | 354 | 325 |
| Winners | 81 | 65 |
| %Winners | 43% | 37% |
Both Wolf and Kozlov played 2 matches. Both players lost a set in the event. Jeff Wolf dropped 1 set, while Stefan Kozlov dropped 1 set. Talking about their workload, Wolf and Kozlov have played the same amount of sets 5. However, Wolf played 4 games more than Kozlov. The American scored 81 winners (43% of the total points). On the other side, The American managed to score 65 winners (37%).
Serve Performance
| Serve | Wolf | Kozlov |
|---|---|---|
| Aces | 11 | 11 |
| Avg per match | 5.5 | 5.5 |
| 1st in | 108/172 | 89/165 |
| %1st in | 63% | 54% |
| 1st pts | 81/108 | 65/89 |
| %1st pts | 75% | 73% |
| 2nd pts | 34/64 | 37/76 |
| %2nd pts | 53% | 49% |
Wolf recorded 11 aces (5.5 per match). Kozlov fired 11 aces (5.5 per match). Wolf won 75% points on his first serve. He quite strong on his second serve to win 53% of the points. On the other side, Kozlov won 73% of the points on his first serve. He had a solid display on his second serve to win 49% of the points.
How they played the important points
| Breaks | Wolf | Kozlov |
|---|---|---|
| Won | 7 | 9 |
| Converted | 7/19 | 9/26 |
| % Converted | 37% | 35% |
| Conceded | 12 | 15 |
| Saved | 8 | 10 |
| % Saved | 67% | 67% |
| Times Broken | 4 | 5 |
The American broke his opponents 7 times with a 37% conversion rate. Wolf surrendered his serve 4 times and he saved 67% of the break points that he conceded. Stefan broke his opponents 9 times with a 35% conversion rate. The American conceded his serve 5 times and he saved 67% of the break points that he conceded.
| Wolf | ||||
| R1 Brooksby | R2 Ghibaudo | Total | ||
|---|---|---|---|---|
| Score | 6-2 6-4 | 7-611 4-6 6-3 | ||
| Tot Set | 2 | 3 | 5 | |
| Tot Games | 18 | 32 | 50 | |
| pts | 69-50 | 121-114 | 190-164 | |
| Total points | 119 | 235 | 354 | |
| Winners | 28 | 53 | 81 | |
| %Winners | 41% | 44% | 43% | |
| SERVE | ||||
| Aces | 3 | 8 | 11 | |
| Double Faults | 0 | 3 | 3 | |
| 1st in | 36/58 | 72/114 | 108/172 | |
| % 1st in | 62% | 63% | 63% | |
| 1st pts | 28/36 | 53/72 | 81/108 | |
| % 1st pts | 78% | 74% | 75% | |
| 2nd pts | 9/22 | 25/42 | 34/64 | |
| % 2nd pts | 41% | 60% | 53% | |
| Breaks | ||||
| Won | 5 | 2 | 7 | |
| Converted | 5/11 | 2/8 | 7/19 | |
| Converted % | 45% | 25% | 37% | |
| Conceded | 3 | 9 | 12 | |
| Saved | 1/3 | 7/9 | 8 | |
| Saved % | 33% | 78% | 56% | |
| Times Broken | 2 | 2 | 4 | |
| Kozlov | ||||
| R1 Braswell | R2 Bigun | Total | ||
|---|---|---|---|---|
| Score | 4-6 6-3 6-4 | 6-2 6-3 | ||
| Tot Set | 3 | 2 | 5 | |
| Tot Games | 29 | 17 | 46 | |
| pts | 108-102 | 68-47 | 176-149 | |
| Total points | 210 | 115 | 325 | |
| Winners | 37 | 28 | 65 | |
| %Winners | 34% | 41% | 37% | |
| SERVE | ||||
| Aces | 6 | 5 | 11 | |
| Double Faults | 8 | 1 | 9 | |
| 1st in | 50/96 | 39/69 | 89/165 | |
| % 1st in | 52% | 57% | 54% | |
| 1st pts | 37/50 | 28/39 | 65/89 | |
| % 1st pts | 74% | 72% | 73% | |
| 2nd pts | 21/46 | 16/30 | 37/76 | |
| % 2nd pts | 46% | 53% | 49% | |
| Breaks | ||||
| Won | 5 | 4 | 9 | |
| Converted | 5/20 | 4/6 | 9/26 | |
| Converted % | 25% | 67% | 35% | |
| Conceded | 7 | 8 | 15 | |
| Saved | 3/7 | 7/8 | 10 | |
| Saved % | 43% | 88% | 66% | |
| Times Broken | 4 | 1 | 5 | |
Tennis Scores in Cleveland Challenger
- Pranav Kumar/Noah SchachterKumar/Noah Schachter – Hans Hach Verdugo/James Kent TrotterHach Verdugo/James Kent Trotter (6-3 7-64) – Stats, scores, rankings
Upcoming matches in the draw
- Karue SellSell – (1-0) – H2H and prediction
- Jeff WolfWolf – Stefan KozlovKozlov (4-5) – H2H and prediction
- James Kent TrotterKent Trotter – (0-0) – H2H and prediction