Name: Stefan Kozlov
Country: USA
Birthdate: 01.02.98, 27 years
ATP ranking: 488
TOP ranking's position: 103 (18.07.22, 533 points)
Points: 86
Prize money: 1.026.233 $
Matches total: 613
Win: 350
%: 57.1 %
Country: USA
Birthdate: 01.02.98, 27 years
ATP ranking: 488
TOP ranking's position: 103 (18.07.22, 533 points)
Points: 86
Prize money: 1.026.233 $
Matches total: 613
Win: 350
%: 57.1 %
| year | summary | Hard | Clay | I. hard | Carpet | Grass | Acrylic |
| 2025 | 9/5 | 2/3 | 3/0 | 4/2 | 0/0 | 0/0 | 0/0 |
| 2024 | 37/20 | 16/9 | 17/8 | 4/3 | 0/0 | 0/0 | 0/0 |
| 2023 | 6/12 | 1/6 | 0/0 | 5/6 | 0/0 | 0/0 | 0/0 |
| 2022 | 21/34 | 14/18 | 0/5 | 4/5 | 0/0 | 3/6 | 0/0 |
| 2021 | 41/15 | 20/12 | 5/2 | 16/1 | 0/0 | 0/0 | 0/0 |
| 2020 | 13/13 | 7/8 | 0/0 | 6/5 | 0/0 | 0/0 | 0/0 |
| 2019 | 22/18 | 14/9 | 4/4 | 4/5 | 0/0 | 0/0 | 0/0 |
| 2018 | 13/26 | 4/12 | 7/6 | 1/4 | 0/0 | 1/4 | 0/0 |
| 2017 | 31/29 | 15/14 | 8/8 | 3/2 | 0/0 | 5/5 | 0/0 |
| 2016 | 58/31 | 28/15 | 10/6 | 16/5 | 0/0 | 4/5 | 0/0 |
| 2015 | 44/27 | 15/12 | 10/5 | 17/8 | 0/0 | 2/2 | 0/0 |
| 2014 | 33/19 | 23/12 | 5/4 | 0/2 | 0/0 | 5/1 | 0/0 |
| 2013 | 17/11 | 3/3 | 11/6 | 0/0 | 0/0 | 3/2 | 0/0 |
| 2012 | 5/3 | 4/2 | 0/0 | 0/0 | 0/0 | 1/1 | 0/0 |
| TOTAL | 350/263 | 166/135 | 80/54 | 80/48 | 0/0 | 24/26 | 0/0 |
| perc. % | 57.1 % | 55.15 % | 59.7 % | 62.5 % | 0 % | 48 % | 0 % |
Stefan Kozlov / Fixtures
| 24.04.25 | 2nd round | Stefan Kozlov | Geoffrey Blancaneaux | match details |  Savannah Challenger | Clay |
Stefan Kozlov form / year 2023
Stefan Kozlov / year 2023
| 13.11.23 | 1st round | Karlis Ozolins | Stefan Kozlov | 2-6, 6-3, 6-4 |  | match details | Champaign Challenger | I. hard |
| 05.11.23 | q 1 | Dmitry Popko | Stefan Kozlov | 6-4, 6-3 | | match details | Knoxville Challenger | I. hard |
| 31.10.23 | 1st round | Lucas Gerch | Stefan Kozlov | 6-2, 5-7, 7-65 | | match details | Charlottesville Challenger | I. hard |
| 30.10.23 | qual. | Stefan Kozlov | Pedro Rodenas | 6-3, 6-1 |  | match details | ||
| 29.10.23 | q 1 | Stefan Kozlov | Adit Sinha | 6-2, 6-4 | | match details | ||
| 25.09.23 | qual. | Stefan Dostanic | Stefan Kozlov | 6-2, 6-1 | | match details | Charleston Challenger | Hard |
| 24.09.23 | q 1 | Stefan Kozlov | Michael Zheng | 7-5, 6-3 | | match details | ||
| 17.09.23 | q 1 | Jack Anthrop | Stefan Kozlov | 6-4, 4-6, 6-4 | | match details | Columbus Challenger | I. hard |
| 19.08.23 | q 1 | Inaki Montes-De La Torre | Stefan Kozlov | 3-6, 6-1, 6-3 | | match details | Winston-Salem | Hard |
| 06.03.23 | q 1 | Roberto Marcora | Stefan Kozlov | 6-1, 6-3 | | match details | Indian Wells | Hard |
| 11.02.23 | q 1 | Matija Pecotic | Stefan Kozlov | 7-61, 5-5, Stefan Kozlov - retired | | match details | Delray Beach | Hard |
| 06.02.23 | qual. | Zachary Svajda | Stefan Kozlov | 6-3, 6-4 | | match details | Dallas | I. hard |
| 05.02.23 | q 1 | Stefan Kozlov | Thai Kwiatkowski | 6-3, 6-4 | | match details | ||
| 03.02.23 | 1/4 | Yibing Wu | Stefan Kozlov | 6-4, 6-1 | | match details | Cleveland Challenger | I. hard |
| 02.02.23 | 2nd round | Stefan Kozlov | Ryan Harrison | 6-4, 6-4 | | match details | ||
| 31.01.23 | 1st round | Stefan Kozlov | Patrick Kypson | 6-4, 7-68 | | match details | ||
| 18.01.23 | 1st round | Lorenzo Giustino | Stefan Kozlov | 7-62, 2-6, 4-1, Stefan Kozlov - retired | | match details |  Tenerife 1 | Hard |
| 09.01.23 | q 1 | Oleksii Krutykh | Stefan Kozlov | 7-5, 6-2 | | match details |  Melbourne | Hard |
