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 2021
Stefan Kozlov / year 2021
| 21.11.21 | fin | Stefan Kozlov | Aleksandar Vukic | 5-7, 6-3, 6-4 |  | match details | Champaign Challenger | I. hard |
| 20.11.21 | 1/2 | Stefan Kozlov | Jeff Wolf | 6-2, 6-3 | | match details | ||
| 19.11.21 | 1/4 | Stefan Kozlov | Mitchell Krueger | 6-4, 6-4 | | match details | ||
| 17.11.21 | 2nd round | Stefan Kozlov | Keegan Smith | 6-3, 6-1 | | match details | ||
| 15.11.21 | 1st round | Stefan Kozlov | Jc Aragone | 3-6, 6-3, 6-4 | | match details | ||
| 11.11.21 | 2nd round | Aidan Mchugh | Stefan Kozlov | 6-4, 6-4 |  | match details | Knoxville Challenger | I. hard |
| 09.11.21 | 1st round | Stefan Kozlov | Aleksandar Vukic | 6-3, 4-6, 7-5 | | match details | ||
| 07.11.21 | fin | Stefan Kozlov | Aleksandar Vukic | 6-2, 6-3 | | match details | Charlottesville Challenger | I. hard |
| 06.11.21 | 1/2 | Stefan Kozlov | Jeff Wolf | 6-1, 6-71, 6-0 | | match details | ||
| 05.11.21 | 1/4 | Stefan Kozlov | Emilio Nava | 6-4, 6-2 | | match details | ||
| 03.11.21 | 2nd round | Stefan Kozlov | Jason Murray Kubler | 6-3, 6-1 | | match details | ||
| 02.11.21 | 1st round | Stefan Kozlov | Bjorn Fratangelo | 7-5, 6-2 | | match details | ||
| 31.10.21 | fin | Jeff Wolf | Stefan Kozlov | 6-4, 6-4 | | match details | Las Vegas | Hard |
| 30.10.21 | 1/2 | Stefan Kozlov | Aleksandar Kovacevic | 6-2, 6-4 | | match details | ||
| 29.10.21 | 1/4 | Stefan Kozlov | Emilio Gomez | 7-63, 6-4 | | match details | ||
| 28.10.21 | 2nd round | Stefan Kozlov | Aidan Mchugh | 6-2, 5-7, 7-613 | | match details | ||
| 26.10.21 | 1st round | Stefan Kozlov | Mukund Sasikumar | 6-2, 6-4 | | match details | ||
| 06.10.21 | qual. | Christopher Eubanks | Stefan Kozlov | 2-6, 6-0, 7-5 | | match details | Indian Wells | Hard |
| 05.10.21 | q 1 | Stefan Kozlov | Jason Jung | 6-3, 3-6, 5-2, Jason Jung - retired | | match details | ||
| 26.09.21 | fin | Stefan Kozlov | Max Purcell | 4-6, 6-2, 6-4 | | match details | Columbus Challenger | I. hard |
| 25.09.21 | 1/2 | Stefan Kozlov | Jeff Wolf | 2-6, 6-3, 7-5 | | match details | ||
| 24.09.21 | 1/4 | Stefan Kozlov | Mikael Torpegaard | 2-6, 7-64, 6-4 | | match details | ||
| 23.09.21 | 2nd round | Stefan Kozlov | Jason Murray Kubler | 6-2, 7-5 | | match details | ||
| 21.09.21 | 1st round | Stefan Kozlov | Mitchell Krueger | 6-0, 6-3 | | match details | ||
| 14.09.21 | 1st round | Zachary Svajda | Stefan Kozlov | 7-5, 2-0, Stefan Kozlov - retired | | match details | Cary 2 | Hard |
| 06.09.21 | 1st round | Franco Agamenone | Stefan Kozlov | 6-4, 7-5 | | match details |  Kyiv Challenger | Clay |
| 02.09.21 | 2nd round | Fernando Verdasco | Stefan Kozlov | 1-6, 7-66, 6-2 | | match details |  Mallorca Challenger | Hard |
| 31.08.21 | 1st round | Stefan Kozlov | Daniel Rincon | 6-3, 1-6, 6-1 | | match details | ||
| 24.08.21 | q 1 | Bernabe Zapata Miralles | Stefan Kozlov | 7-5, 1-6, 6-3 | | match details | New York | Hard |
| 29.07.21 | 2nd round | Alejandro Tabilo | Stefan Kozlov | 6-2, 6-2 | | match details | Lexington Challenger | Hard |
| 27.07.21 | 1st round | Stefan Kozlov | Christopher Eubanks | 7-63, 7-66 | | match details | ||
| 26.07.21 | qual. | Stefan Kozlov | Edan Leshem | 3-6, 7-64, 6-1 | | match details | ||
| 25.07.21 | q 1 | Stefan Kozlov | Sam Riffice | 6-2, 6-3 | | match details | ||
| 24.07.21 | 1/2 | Ramkumar Ramanathan | Stefan Kozlov | 1-6, 6-3, 6-1 | | match details | Cary Challenger | Hard |
| 23.07.21 | 1/4 | Stefan Kozlov | Christopher Eubanks | 5-7, 6-1, 6-3 | | match details | ||
| 21.07.21 | 2nd round | Stefan Kozlov | Maxime Cressy | 3-6, 6-3, 6-4 | | match details | ||
| 19.07.21 | 1st round | Stefan Kozlov | Donald Young | 4-6, 6-4, 6-4 | | match details | ||
| 04.07.21 | 1/2 | Stefan Kozlov | Ryan Harrison | 5-7, 6-3, 6-3 | | match details | M15 Weston | Clay |
| 03.07.21 | 1/4 | Stefan Kozlov | Christian Langmo | 6-2, 7-5 | | match details | ||
| 03.07.21 | 2nd round | Stefan Kozlov | Ben Shelton | 7-5, 6-1 | | match details | ||
| 01.07.21 | 1st round | Stefan Kozlov | Evan Zhu | 6-3, 3-6, 6-1 | | match details | ||
| 16.06.21 | 1st round | Michail Pervolarakis | Stefan Kozlov | 7-64, 6-4 | | match details | M25 Tulsa | Hard |
| 08.06.21 | 1st round | Thiago Agustin Tirante | Stefan Kozlov | 6-3, 6-1 | | match details | Orlando 2 | Hard |
| 07.06.21 | qual. | Stefan Kozlov | Adrian Andreev | 4-6, 6-4, 6-4 | | match details | ||
| 06.06.21 | q 1 | Stefan Kozlov | Robert Galloway | 6-4, 7-64 | | match details | ||
| 02.06.21 | 1st round | Thai Kwiatkowski | Stefan Kozlov | 6-2, 6-1 | | match details | Little Rock | Hard |
| 31.05.21 | qual. | Stefan Kozlov | Strong Kirchheimer | 6-3, 6-2 | | match details | ||
| 30.05.21 | q 1 | Stefan Kozlov | Brian Battistone | 6-2, 6-2 | | match details | ||
| 16.03.21 | 1st round | Cameron Norrie | Stefan Kozlov | 6-3, 6-3 | | match details |  Acapulco | Hard |
| 15.03.21 | qual. | Stefan Kozlov | Botic Van De Zandschulp | 6-3, 1-0, Botic Van De Zandschulp - retired | | match details | ||
| 14.03.21 | q 2 | Stefan Kozlov | Joao Sousa | 6-2, 2-6, 6-3 | | match details | ||
| 13.03.21 | q 1 | Stefan Kozlov | Jordi Arconada | 6-4, 6-1 | | match details | ||
| 18.02.21 | 2nd round | Mitchell Krueger | Stefan Kozlov | 6-4, 3-0, Stefan Kozlov - retired | | match details | M25 Naples | Clay |
| 17.02.21 | 1st round | Stefan Kozlov | Gonzalo Villanueva | 6-3, 6-2 | | match details | ||
| 06.01.21 | qual. | Donald Young | Stefan Kozlov | 4-6, 6-4, 6-4 | | match details | Delray Beach | Hard |
| 05.01.21 | q 1 | Stefan Kozlov | Johannes Haerteis | 5-0, Johannes Haerteis - retired | | match details |
