Name: Stefan Kozlov
Country: USA
Birthdate: 01.02.98, 27 years
ATP ranking: 441
TOP ranking's position: 103 (18.07.22, 533 points)
Points: 102
Prize money: 1026233 $
Matches total: 615
Win: 351
%: 57.07 %
Country: USA
Birthdate: 01.02.98, 27 years
ATP ranking: 441
TOP ranking's position: 103 (18.07.22, 533 points)
Points: 102
Prize money: 1026233 $
Matches total: 615
Win: 351
%: 57.07 %
| year | summary | Hard | Clay | I. hard | Carpet | Grass | Acrylic |
| 2025 | 10/6 | 2/3 | 4/1 | 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 | 351/264 | 166/135 | 81/55 | 80/48 | 0/0 | 24/26 | 0/0 |
| perc. % | 57.07 % | 55.15 % | 59.56 % | 62.5 % | 0 % | 48 % | 0 % |
Stefan Kozlov / scheduled / last
| no matches found |
Stefan Kozlov form / year 2016 / surface: Hard
Stefan Kozlov / year 2016 / surface: Hard
| 30.10.16 | fin | Yen-Hsun Lu | Stefan Kozlov | 6-0, 6-1 |  | match details |  Suzhou Challenger | Hard |
| 29.10.16 | 1/2 | Stefan Kozlov | Alexander Kudryavtsev | 6-3, 0-1, Alexander Kudryavtsev - retired |  | match details | ||
| 28.10.16 | 1/4 | Stefan Kozlov | Sergiy Stakhovsky | 3-6, 6-2, 7-5 | | match details | ||
| 27.10.16 | 2nd round | Stefan Kozlov | Cheong-Eui Kim | 6-4, 6-3 | | match details | ||
| 25.10.16 | 1st round | Stefan Kozlov | Yecong He | 5-7, 6-0, 6-4 | | match details | ||
| 21.10.16 | 1/4 | Yen-Hsun Lu | Stefan Kozlov | 3-6, 6-4, 6-4 | | match details | Ningboo Challenger | Hard |
| 20.10.16 | 2nd round | Stefan Kozlov | Di Wu | 7-64, 6-3 | | match details | ||
| 18.10.16 | 1st round | Stefan Kozlov | Jimmy Wang | 6-2, 6-4 | | match details | ||
| 10.10.16 | 1st round | Taro Daniel | Stefan Kozlov | 6-4, 6-3 | | match details |  Ho Chi | Hard |
| 28.09.16 | 2nd round | Michael Mmoh | Stefan Kozlov | 7-5, 6-4 | | match details |  Tiburon Challenger | Hard |
| 26.09.16 | 1st round | Stefan Kozlov | Guilherme Clezar | 6-2, 6-2 | | match details | ||
| 16.09.16 | 1/4 | Ernesto Escobedo | Stefan Kozlov | 3-6, 6-1, 6-2 | | match details | Cary Challenger | Hard |
| 15.09.16 | 2nd round | Stefan Kozlov | Philip Bester | 6-4, 6-1 | | match details | ||
| 13.09.16 | 1st round | Stefan Kozlov | Erik Crepaldi | 3-6, 6-4, 6-2 | | match details | ||
| 24.08.16 | q 1 | Michael Berrer | Stefan Kozlov | 2-6, 7-65, 6-2 | | match details | New York | Hard |
| 14.08.16 | qual. | Malek Jaziri | Stefan Kozlov | 6-4, 6-2 | | match details | Cincinnati | Hard |
| 14.08.16 | q 1 | Stefan Kozlov | Damir Dzumhur | 6-4, 3-6, 7-5 | | match details | ||
| 09.08.16 | 1st round | Mackenzie Mcdonald | Stefan Kozlov | 6-1, 6-4 | | match details | Aptos Challenger | Hard |
| 28.07.16 | 2nd round | Alex Kuznetsov | Stefan Kozlov | 3-6, 6-3, 6-4 | | match details | Lexington Challenger | Hard |
| 26.07.16 | 1st round | Stefan Kozlov | Andrey Golubev | 6-2, 6-2 | | match details | ||
| 22.07.16 | 1/4 | Darian King | Stefan Kozlov | 6-2, 4-1, Stefan Kozlov - retired | | match details | Binghamton Challenger | Hard |
| 20.07.16 | 2nd round | Stefan Kozlov | Daniel Nguyen | 7-67, 6-4 | | match details | ||
| 19.07.16 | 1st round | Stefan Kozlov | Dennis Nevolo | 3-6, 7-5, 6-0 | | match details | ||
| 06.07.16 | 2nd round | Go Soeda | Stefan Kozlov | 6-3, 6-2 | | match details | Winnetka Challenger | Hard |
| 05.07.16 | 1st round | Stefan Kozlov | Sekou Bangoura | 6-4, 3-6, 6-2 | | match details | ||
| 17.04.16 | fin | Stefan Kozlov | Eric Quigley | 6-73, 6-3, 7-610 | | match details | USA F13 | Hard |
| 16.04.16 | 1/2 | Stefan Kozlov | Tennys Sandgren | 6-2, 6-4 | | match details | ||
| 15.04.16 | 1/4 | Stefan Kozlov | Evan King | 7-5, 6-4 | | match details | ||
| 14.04.16 | 2nd round | Stefan Kozlov | Sebastian Fanselow | 6-2, 6-2 | | match details | ||
| 13.04.16 | 1st round | Stefan Kozlov | Jeff Wolf | 6-1, 6-3 | | match details | ||
| 10.04.16 | fin | Malek Jaziri | Stefan Kozlov | 6-2, 6-4 | | match details |  Le Gosier | Hard |
| 09.04.16 | 1/2 | Stefan Kozlov | Yoshihito Nishioka | 3-6, 7-5, 6-3 | | match details | ||
| 08.04.16 | 1/4 | Stefan Kozlov | Vincent Millot | 5-7, 7-5, 6-2 | | match details | ||
| 07.04.16 | 2nd round | Stefan Kozlov | Constant Lestienne | 6-2, 3-6, 6-1 | | match details | ||
| 05.04.16 | 1st round | Stefan Kozlov | Austin Krajicek | 6-3, 6-4 | | match details | ||
| 22.03.16 | 1st round | Ernesto Escobedo | Stefan Kozlov | 6-3, 6-4 | | match details | USA F11 | Hard |
| 26.01.16 | 1st round | Nicolas Meister | Stefan Kozlov | 6-3, 6-1 | | match details | Maui Challenger | Hard |
| 13.01.16 | 1st round | Michael Mmoh | Stefan Kozlov | 7-5, 6-4 | | match details | USA F2 | Hard |
| 10.01.16 | fin | Stefan Kozlov | Philip Bester | 7-67, 6-73, 6-3 | | match details | USA F1 | Hard |
| 09.01.16 | 1/2 | Stefan Kozlov | Tennys Sandgren | 6-1, 6-1 | | match details | ||
| 08.01.16 | 2nd round | Stefan Kozlov | Max De Vroome | 6-3, 6-3 | | match details | ||
| 08.01.16 | 1/4 | Stefan Kozlov | Gianluigi Quinzi | 6-3, 3-6, 6-1 | | match details | ||
| 06.01.16 | 1st round | Stefan Kozlov | Jean-Yves Aubone | 6-0, 7-5 | | match details |