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 2019
Stefan Kozlov / year 2019
| 15.11.19 | 1/4 | Jeff Wolf | Stefan Kozlov | 6-2, 6-2 |  | match details | Champaign Challenger | I. hard |
| 14.11.19 | 3rd round | Stefan Kozlov | Evan Song | 6-4, 4-6, 6-1 |  | match details | ||
| 13.11.19 | 2nd round | Stefan Kozlov | Denis Kudla | 6-3, 6-3 | | match details | ||
| 11.11.19 | 1st round | Stefan Kozlov | Simon Carr | 6-2, 4-6, 7-64 | | match details | ||
| 01.11.19 | 1/4 | Cristian Rodriguez | Stefan Kozlov | 6-2, 6-2 | | match details | M25 Naples | Clay |
| 31.10.19 | 2nd round | Stefan Kozlov | Sam Riffice | 6-2, 6-4 | | match details | ||
| 29.10.19 | 1st round | Stefan Kozlov | Mwendwa Mbithi | 6-4, 6-3 | | match details | ||
| 18.10.19 | 1/4 | James Duckworth | Stefan Kozlov | 6-2, 6-3 | | match details | Las Vegas | Hard |
| 17.10.19 | 3rd round | Stefan Kozlov | Alexander Ritschard | 5-7, 6-4, 6-1 | | match details | ||
| 15.10.19 | 2nd round | Stefan Kozlov | Blaz Rola | 6-4, 6-3 | | match details | ||
| 14.10.19 | 1st round | Stefan Kozlov | Evan Song | 6-4, 6-3 | | match details | ||
| 20.08.19 | q 1 | Egor Gerasimov | Stefan Kozlov | 6-4, 6-4 | | match details | New York | Hard |
| 23.07.19 | 1st round | Roberto Ortega-Olmedo | Stefan Kozlov | 6-75, 3-0, Stefan Kozlov - retired | | match details | Binghamton Challenger | Hard |
| 11.07.19 | 3rd round | Jason Murray Kubler | Stefan Kozlov | 6-2, 6-3 | | match details | Winnetka Challenger | Hard |
| 09.07.19 | 2nd round | Stefan Kozlov | Adrian Menendez-Maceiras | 7-5, 4-0, Adrian Menendez-Maceiras - retired | | match details | ||
| 08.07.19 | 1st round | Stefan Kozlov | Evgeny Karlovskiy | 6-2, 6-4 | | match details | ||
| 05.06.19 | 2nd round | Zhe Li | Stefan Kozlov | 6-3, 5-7, 6-0 | | match details | Little Rock | Hard |
| 04.06.19 | 1st round | Stefan Kozlov | Garrett Johns | 7-5, 6-3 | | match details | ||
| 29.04.19 | 1st round | Aleksandar Vukic | Stefan Kozlov | 6-2, 7-611 | | match details | Savannah Challenger | Clay |
| 24.04.19 | 2nd round | Tennys Sandgren | Stefan Kozlov | 6-3, 6-2 | | match details | Tallahassee Challenger | Clay |
| 22.04.19 | 1st round | Stefan Kozlov | Alexander Zhurbin | 4-6, 6-4, 6-0 | | match details | ||
| 11.04.19 | 2nd round | Dmitry Popko | Stefan Kozlov | 7-5, 6-3 | | match details | M15 Sunrise | Clay |
| 10.04.19 | 1st round | Stefan Kozlov | Mateus Alves | 6-3, 6-1 | | match details | ||
| 24.03.19 | fin | Alexander Ritschard | Stefan Kozlov | 6-2, 0-6, 7-65 | | match details | M25 Calabasas | Hard |
| 23.03.19 | 1/2 | Stefan Kozlov | Drew Baird | 6-2, 6-2 | | match details | ||
| 22.03.19 | 1/4 | Stefan Kozlov | Jonathan Gray | 6-2, 6-1 | | match details | ||
| 21.03.19 | 2nd round | Stefan Kozlov | Isaiah Strode | 7-63, 6-0 | | match details | ||
| 19.03.19 | 1st round | Stefan Kozlov | Ronnie Schneider | 6-2, 6-0 | | match details | ||
| 11.03.19 | 1st round | Gijs Brouwer | Stefan Kozlov | 7-5, 6-3 | | match details |  Drummondville Challenger | I. hard |
| 21.02.19 | 3rd round | Roberto Quiroz | Stefan Kozlov | 6-4, 7-65 | | match details |  Morelos Challenger | Hard |
| 19.02.19 | 2nd round | Stefan Kozlov | Alexander Sarkissian | 6-4, 3-0, Alexander Sarkissian - retired | | match details | ||
| 18.02.19 | 1st round | Stefan Kozlov | Evan Song | 7-5, 6-3 | | match details | ||
| 05.02.19 | 1st round | Alex Rybakov | Stefan Kozlov | 6-2, 6-1 | | match details | Dallas Challenger | I. hard |
| 30.01.19 | 2nd round | Brayden Schnur | Stefan Kozlov | 7-65, 6-4 | | match details | Cleveland Challenger | I. hard |
| 28.01.19 | 1st round | Stefan Kozlov | Louis Wessels | 6-4, 5-7, 7-5 | | match details | ||
| 21.01.19 | qual. | Maxime Cressy | Stefan Kozlov | 7-5, 6-1 | | match details | Newport Beach | Hard |
| 07.01.19 | 1st round | Jeff Wolf | Stefan Kozlov | 6-2, 7-64 | | match details | Columbus Challenger | I. hard |
| 03.01.19 | 3rd round | Nino Serdarusic | Stefan Kozlov | 6-2, 7-5 | | match details | Orlando Challenger | Hard |
| 02.01.19 | 2nd round | Stefan Kozlov | Mitchell Krueger | 6-2, 5-7, 6-3 | | match details | ||
| 31.12.18 | 1st round | Stefan Kozlov | Alejandro Gonzalez | 6-2, 4-6, 6-4 | | match details |
