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 2018
Stefan Kozlov / year 2018
| 13.11.18 | 1st round | Paolo Lorenzi | Stefan Kozlov | 6-4, 3-6, 6-4 |  | match details | Houston Challenger | Hard |
| 04.11.18 | q 1 | Evan Song | Stefan Kozlov | 6-4, 3-6, 6-3 | | match details | Knoxville Challenger | I. hard |
| 28.10.18 | q 2 | Petros Chrysochos | Stefan Kozlov | 1-6, 6-3, 6-2 | | match details | Charlottesville Challenger | I. hard |
| 27.10.18 | q 1 | Stefan Kozlov | Emil Reinberg | 3-6, 7-64, 6-1 |  | match details | ||
| 23.10.18 | 1st round | Kamil Majchrzak | Stefan Kozlov | 6-0, 6-2 | | match details | Las Vegas | Hard |
| 15.10.18 | 1st round | Jan Choinski | Stefan Kozlov | 6-3, 6-3 | | match details |  Calgary Challenger | I. hard |
| 01.10.18 | 1st round | Lucas Gomez | Stefan Kozlov | 6-2, 6-4 | | match details |  Monterrey Challenger | Hard |
| 06.08.18 | 1st round | Kaichi Uchida | Stefan Kozlov | 6-4, 6-1 | | match details | Aptos Challenger | Hard |
| 28.07.18 | q 1 | Jared Hiltzik | Stefan Kozlov | 6-3, 6-3 | | match details | Washington | Hard |
| 26.06.18 | q 2 | Yannick Maden | Stefan Kozlov | 6-1, 6-3 | | match details |  Wimbledon | Grass |
| 25.06.18 | q 1 | Stefan Kozlov | Dustin Brown | 6-3, 6-1 | | match details | ||
| 17.06.18 | q 1 | Brydan Klein | Stefan Kozlov | 4-6, 6-1, 7-5 | | match details | Ilkley Challenger | Grass |
| 12.06.18 | 1st round | Christopher Eubanks | Stefan Kozlov | 6-3, 6-3 | | match details | Nottingham Challenger | Grass |
| 02.06.18 | q 1 | Daniel Evans | Stefan Kozlov | 6-1, 6-0 | | match details | Surbiton Challenger | Grass |
| 22.05.18 | q 1 | Yasutaka Uchiyama | Stefan Kozlov | 6-4, 7-5 | | match details |  Paris | Clay |
| 27.05.18 | q 2 | Martin Cuevas | Stefan Kozlov | 6-4, 6-1 | | match details |  Vicenza Challenger | Clay |
| 26.05.18 | q 1 | Stefan Kozlov | Edoardo Sardella | 6-1, 6-2 | | match details | ||
| 18.05.18 | 1/4 | Reilly Opelka | Stefan Kozlov | 7-64, 6-1 | | match details | Bordeaux Challenger | Clay |
| 16.05.18 | 2nd round | Stefan Kozlov | Antoine Hoang | 6-3, 7-64 | | match details | ||
| 15.05.18 | 1st round | Stefan Kozlov | Pierre-Hugues Herbert | 6-2, 7-65 | | match details | ||
| 08.05.18 | 1st round | Constant Lestienne | Stefan Kozlov | 7-62, 6-4 | | match details | Aix En | Clay |
| 20.04.18 | 1/4 | Hugo Dellien | Stefan Kozlov | 5-7, 6-1, 7-66 | | match details | Sarasota Challenger | Clay |
| 18.04.18 | 2nd round | Stefan Kozlov | Donald Young | 6-4, 6-4 | | match details | ||
| 16.04.18 | 1st round | Stefan Kozlov | Mitchell Krueger | 6-4, 6-3 | | match details | ||
| 10.04.18 | 1st round | Guido Pella | Stefan Kozlov | 6-3, 6-2 | | match details | Houston | Clay |
| 08.04.18 | qual. | Stefan Kozlov | Akira Santillan | 6-2, 6-0 | | match details | ||
| 07.04.18 | q 1 | Stefan Kozlov | Thomaz Bellucci | 6-73, 6-3, 7-65 | | match details | ||
| 19.03.18 | q 1 | Cameron Norrie | Stefan Kozlov | 6-1, 2-0, Stefan Kozlov - retired | | match details | Miami | Hard |
| 06.03.18 | q 1 | Adrian Menendez-Maceiras | Stefan Kozlov | 6-2, 7-68 | | match details | Indian Wells | Hard |
| 28.02.18 | 2nd round | Peter Polansky | Stefan Kozlov | 6-2, 6-4 | | match details | Indian Wells | Hard |
| 27.02.18 | 1st round | Stefan Kozlov | Mirza Basic | 7-5, 6-4 | | match details | ||
| 17.02.18 | q 1 | Ramkumar Ramanathan | Stefan Kozlov | 6-3, 6-2 | | match details | Delray Beach | Hard |
| 30.01.18 | 1st round | Frances Tiafoe | Stefan Kozlov | 6-2, 7-65 | | match details | Dallas Challenger | I. hard |
| 24.01.18 | 2nd round | Miomir Kecmanovic | Stefan Kozlov | 6-3, 6-4 | | match details | Newport Beach | Hard |
| 22.01.18 | 1st round | Stefan Kozlov | Guilherme Clezar | 6-2, 6-3 | | match details | ||
| 14.01.18 | qual. | Dustin Brown | Stefan Kozlov | 6-4, 3-6, 6-3 | | match details |  Melbourne | Hard |
| 11.01.18 | q 2 | Stefan Kozlov | Yannick Hanfmann | 4-6, 7-62, 6-4 | | match details | ||
| 10.01.18 | q 1 | Stefan Kozlov | Blake Ellis | 7-63, 4-6, 7-63 | | match details | ||
| 01.01.18 | 1st round | Corentin Moutet | Stefan Kozlov | 7-64, 3-6, 6-2 | | match details | Noumea Challenger | Hard |
