ATPranked 132 (2022-10-30)rating 1357 · peak 1701
Stefan Kozlov
USA · 28 years old · plays right-handed · 6'0" tall · born in Skopje, Macedonia
ATP singles record since 2007
Won-lost
22-48
31% of matches
Titles
0
0 finals lost
Tiebreaks
4-8
won-lost
Deciding sets
9 of 15
43% of games won
By surface
| Surface | Won-lost | Win % | Games won | Tiebreaks | Rating |
|---|---|---|---|---|---|
| hard | 13-34 | 28% | 43% | 2-7 | 1349 |
| grass | 9-11 | 45% | 47% | 2-1 | 1507 |
| clay | 0-3 | 0% | 25% | 0-0 | 1328 |
Counted from scores; walkovers excluded. See surface Elo and share of games won.
Recent matches
| Date | Tournament | Opponent | Result | Score |
|---|---|---|---|---|
| 2026-07-25 | Mubadala DC Open Qualifying 1st Round | Zachary Svajda | loss | 7-5 6-1 |
| 2026-02-22 | Abierto Mexicano Telcel presentado por HSBC Qualifying 1st Round | Patrick Kypson | loss | 7-6(3) 6-0 |
| 2025-02-24 | Abierto Mexicano Telcel presentado por HSBC Qualifying Final | Nishesh Basavareddy | loss | 6-2 6-4 |
| 2025-02-23 | Abierto Mexicano Telcel presentado por HSBC Qualifying 1st Round | Duarte Vale | win | 6-1 6-4 |
| 2025-02-08 | Delray Beach Open Qualifying 1st Round | Zachary Svajda | loss | 6-3 6-0 |
| 2024-03-30 | Fayez Sarofim & Co. U.S. Men's Clay Court Championship Qualifying 1st Round | Denis Yevseyev | loss | 6-2 6-0 |
| 2024-02-11 | Delray Beach Open Qualifying 1st Round | Shintaro Mochizuki | loss | 6-3 7-6(2) |
| 2023-08-19 | Winston-Salem Open Qualifying 1st Round | Inaki Montes-De La Torre | loss | 3-6 6-1 6-3 |
| 2023-03-07 | BNP Paribas Open Qualifying 1st Round | Roberto Marcora | loss | 6-1 6-3 |
| 2023-02-11 | Delray Beach Open Qualifying 1st Round | Matija Pecotic | loss | 7-6(1) 5-5 ret. |
| 2023-02-06 | Nexo Dallas Open Qualifying Final | Zachary Svajda | loss | 6-3 6-4 |
| 2023-02-05 | Nexo Dallas Open Qualifying 1st Round | Thai-Son Kwiatkowski | win | 6-3 6-4 |
| 2023-01-09 | Australian Open Qualifying 1st Round | Oleksii Krutykh | loss | 7-5 6-2 |
| 2022-09-20 | Cymbiotika San Diego Open Round 1 | J.J. Wolf | loss | 6-2 7-6(6) |
| 2022-08-29 | US Open Round 1 | Daniil Medvedev | loss | 6-2 6-4 6-0 |
| 2022-08-13 | Cincinnati Open Qualifying 1st Round | Dusan Lajovic | loss | 6-3 7-5 |
| 2022-08-01 | Mubadala DC Open Round 1 | Jack Draper | loss | 7-5 6-2 |
| 2022-07-23 | Atlanta Open Qualifying 1st Round | Ramkumar Ramanathan | loss | 6-0 6-1 |
| 2022-07-11 | Cerity Partners Hall of Fame Open for the Van Alen Cup Presented by the Margaret Fund Round 1 | Steve Johnson | loss | 7-5 6-3 |
| 2022-06-28 | Wimbledon Round 1 | Diego Schwartzman | loss | 6-3 6-2 6-2 |
| 2022-06-23 | Wimbledon Qualifying Final | Dennis Novak | loss | 7-5 6-4 5-7 3-6 6-3 |
| 2022-06-22 | Wimbledon Qualifying 2nd Round | Dominic Stricker | win | 7-6(9) 4-6 6-3 |
| 2022-06-20 | Wimbledon Qualifying 1st Round | Evan Furness | win | 7-5 6-3 |
| 2022-06-11 | HSBC Championships Qualifying 1st Round | Steve Johnson | loss | 6-0 6-0 |
| 2022-06-04 | Libéma Open Qualifying 1st Round | Matthew Ebden | loss | 6-4 6-4 |
| 2022-05-17 | Roland Garros Qualifying 1st Round | Nino Serdarusic | loss | 7-5 6-0 |
| 2022-03-21 | Miami Open presented by Itau Qualifying 1st Round | Mitchell Krueger | loss | 6-2 6-2 |
| 2022-03-10 | BNP Paribas Open Qualifying Final | Holger Rune | loss | 6-4 6-2 |
| 2022-03-09 | BNP Paribas Open Qualifying 1st Round | Sebastian Sec | win | 6-3 6-7(4) 6-2 |
| 2022-02-24 | Abierto Mexicano Telcel presentado por HSBC Round 2 | Rafael Nadal | loss | 6-0 6-3 |
| 2022-02-22 | Abierto Mexicano Telcel presentado por HSBC Round 1 | Grigor Dimitrov | win | 7-6(8) 5-7 6-3 |
| 2022-02-18 | Delray Beach Open QF | Tommy Paul | loss | 6-3 6-1 |
| 2022-02-18 | Delray Beach Open QF | Tommy Paul | loss | 6-3 6-1 |
| 2022-02-16 | Delray Beach Open Round 2 | Steve Johnson | win | 6-1 6-3 |
| 2022-02-16 | Delray Beach Open Round 2 | Steve Johnson | win | 6-1 6-3 |
| 2022-02-15 | Delray Beach Open Round 1 | Emilio Gomez | win | 4-6 7-5 6-3 |
| 2022-02-15 | Delray Beach Open Round 1 | Emilio Gomez | win | 4-6 7-5 6-3 |
| 2022-02-13 | Delray Beach Open Qualifying Final | Bjorn Fratangelo | final | n/a |
| 2022-02-13 | Delray Beach Open Qualifying Final | Bjorn Fratangelo | win | 6-3 1-0 ret. |
| 2022-02-12 | Delray Beach Open Qualifying 1st Round | Go Soeda | win | 7-5 6-2 |
| 2022-02-12 | Delray Beach Open Qualifying 1st Round | Go Soeda | win | 7-5 6-2 |
| 2022-01-19 | Australian Open Round 2 | Matteo Berrettini | loss | 6-1 4-6 6-4 6-1 |
| 2022-01-19 | Australian Open Round 2 | Matteo Berrettini | loss | 6-1 4-6 6-4 6-1 |
| 2022-01-17 | Australian Open Round 1 | Jiri Vesely | win | 7-5 6-3 6-4 |
| 2022-01-17 | Australian Open Round 1 | Jiri Vesely | win | 7-5 6-3 6-4 |
| 2021-08-24 | US Open | Bernabe Zapata Miralles | loss | 7-5 1-6 6-3 |
| 2021-03-17 | Abierto Mexicano Telcel presentado por HSBC Round 1 | Cameron Norrie | loss | 6-3 6-3 |
| 2020-02-18 | Delray Beach Open by Vitacost.com Round 1 | Ugo Humbert | loss | 6-7(5) 6-3 6-1 |
| 2018-06-25 | Wimbledon | Dustin Brown | win | 6-3 6-1 |
| 2018-04-10 | Fayez Sarofim & Co. U.S. Men's Clay Court Championship Round 1 | Guido Pella | loss | 6-3 6-2 |
| 2017-08-14 | ATP & WTA Western & Southern Open Round 1 | Sam Querrey | loss | 6-3 6-0 |
| 2017-07-31 | ATP & WTA Citi Open Round 1 | Yuki Bhambri | loss | 7-5 2-0 ret. |
| 2017-07-24 | ATP BB&T Atlanta Open Round 1 | Quentin Halys | loss | 7-5 7-6(7) |
| 2017-07-17 | ATP Dell Technologies Hall of Fame Tennis Championships Round 1 | Adrian Menendez-Maceiras | loss | 6-2 7-6(5) |
| 2017-06-22 | ATP AEGON Championships Round 2 | Marin Cilic | loss | 6-0 6-4 |
| 2017-06-20 | ATP AEGON Championships Round 1 | Steve Johnson | win | 3-6 6-1 6-1 |
| 2017-06-15 | ATP & WTA Topshelf Open Round 2 | Ivo Karlovic | loss | 6-4 6-1 |
| 2017-06-13 | ATP & WTA Topshelf Open | Dustin Brown | win | 6-3 3-6 6-3 |
| 2017-06-13 | ATP & WTA Topshelf Open Round 1 | Dustin Brown | win | 6-3 3-6 6-3 |
| 2017-03-10 | ATP & WTA BNP Paribas Open Round 1 | Donald Young | loss | 7-5 7-6(5) |
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