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
Stefan Kozlov / Latest Scores
| 22.04.25 | 1st round | Stefan Kozlov | Max Wiskandt | 6-2, 6-1 |  | match details | Savannah Challenger | Clay |
| 21.04.25 | qual. | Stefan Kozlov | Christian Sigsgaard | 6-4, 6-4 | | match details | ||
| 20.04.25 | q 1 | Stefan Kozlov | Ryan Fishback | 7-5, 6-3 | | match details | ||
| 02.04.25 | 2nd round | Rafael Jodar | Stefan Kozlov | 7-5, 3-6, 6-2 |  | match details |  Cuernavaca Challenger | Hard |
| 31.03.25 | 1st round | Stefan Kozlov | Thiago Agustin Tirante | 4-6, 6-4, 6-2 | | match details | ||
| 23.02.25 | qual. | Nishesh Basavareddy | Stefan Kozlov | 6-2, 6-4 | | match details | Acapulco | Hard |
| 22.02.25 | q 1 | Stefan Kozlov | Duarte Vale | 6-1, 6-4 | | match details | ||
| 08.02.25 | q 1 | Zachary Svajda | Stefan Kozlov | 6-3, 6-0 | | match details | Delray Beach | Hard |
| 31.01.25 | 1/4 | Jeff Wolf | Stefan Kozlov | 6-1, 6-3 | | match details | Cleveland Challenger | I. hard |
| 30.01.25 | 2nd round | Stefan Kozlov | Kaylan Bigun | 6-2, 6-3 | | match details | ||
| 28.01.25 | 1st round | Stefan Kozlov | Micah Braswell | 4-6, 6-3, 6-4 | | match details | ||
| 22.01.25 | 1st round | Elmer Moller | Stefan Kozlov | 6-3, 7-5 | | match details |  Quimper Challenger | I. hard |
| 21.01.25 | qual. | Stefan Kozlov | Loann Massard | 4-6, 6-2, 6-4 | | match details | ||
| 20.01.25 | q 1 | Stefan Kozlov | Filip Misolic | 6-3, 6-4 | | match details | ||
| 12.11.24 | 1st round | Patrick Kypson | Stefan Kozlov | 1-6, 7-63, 6-4 | | match details | Champaign Challenger | I. hard |
| 24.10.24 | 2nd round | Murphy Cassone | Stefan Kozlov | Stefan Kozlov - walk over | | match details | Sioux Falls | I. hard |
| 21.10.24 | 1st round | Stefan Kozlov | Dmitry Popko | 7-63, 4-6, 6-4 | | match details | ||
| 06.08.24 | 1st round | Nishesh Basavareddy | Stefan Kozlov | 2-6, 6-4, 6-2 | | match details | Lincoln Challenger | Hard |
| 05.08.24 | qual. | Stefan Kozlov | Ernesto Escobedo | 6-3, 6-1 | | match details | ||
| 04.08.24 | q 1 | Stefan Kozlov | Collin Altamirano | 6-4, 7-64 | | match details | ||
| 30.07.24 | 1st round | Bernard Tomic | Stefan Kozlov | 6-4, 3-6, 6-3 | | match details | Lexington Challenger | Hard |
| 29.07.24 | qual. | Stefan Kozlov | Stefan Dostanic | 7-63, 0-6, 7-5 | | match details | ||
| 28.07.24 | q 1 | Stefan Kozlov | Ryuki Matsuda | 6-2, 6-3 | | match details | ||
| 17.07.24 | 1st round | Nicolas Mejia | Stefan Kozlov | 6-1, 6-2 | | match details |  Granby Challenger | Hard |
| 15.07.24 | qual. | Stefan Kozlov | Cooper Williams | 6-1, 7-63 | | match details | ||
| 14.07.24 | q 1 | Stefan Kozlov | Victor Lilov | 6-2, 6-1 | | match details | ||
| 06.07.24 | 1/2 | Nishesh Basavareddy | Stefan Kozlov | 6-2, 2-0, Stefan Kozlov - retired | | match details | Bloomfield Hills | Hard |
| 05.07.24 | 1/4 | Stefan Kozlov | Jeff Wolf | 6-4, 6-4 | | match details | ||
| 03.07.24 | 2nd round | Stefan Kozlov | Tung-Lin Wu | 5-7, 6-3, 4-0, Tung-Lin Wu - retired | | match details | ||
| 02.07.24 | 1st round | Stefan Kozlov | Michael Zheng | 4-6, 7-5, 6-1 | | match details | ||
| 01.07.24 | qual. | Stefan Kozlov | William Grant | 6-1, 6-4 | | match details | ||
| 30.06.24 | q 1 | Stefan Kozlov | Nicholas Herdoiza | 6-3, 6-1 | | match details | ||
| 05.06.24 | 2nd round | Chak Lam Coleman Wong | Stefan Kozlov | 4-6, 6-4, 4-1, Stefan Kozlov - retired | | match details | Tyler Challenger | Hard |
| 03.06.24 | 1st round | Stefan Kozlov | Blaise Bicknell | 6-3, 6-3 | | match details | ||
| 28.05.24 | 1st round | Rudy Quan | Stefan Kozlov | 6-1, 7-5 | | match details | Little Rock | Hard |
| 23.04.24 | 1st round | Alexander Ritschard | Stefan Kozlov | 6-3, 7-5 | | match details | Savannah Challenger | Clay |
| 20.04.24 | 1/2 | Mitchell Krueger | Stefan Kozlov | 6-3, 3-6, 6-1 | | match details | Tallahassee Challenger | Clay |
| 19.04.24 | 1/4 | Stefan Kozlov | Oliver Crawford | 6-2, 6-2 | | match details | ||
| 17.04.24 | 2nd round | Stefan Kozlov | Tennys Sandgren | 6-2, 6-75, 6-1 | | match details | ||
| 15.04.24 | 1st round | Stefan Kozlov | Gerard Campana Lee | 4-6, 6-3, 6-0 | | match details | ||
| 12.04.24 | 1/4 | Tennys Sandgren | Stefan Kozlov | 6-1, 6-4 | | match details | Sarasota Challenger | Clay |
| 10.04.24 | 2nd round | Stefan Kozlov | Ethan Quinn | 6-2, 5-7, 6-4 | | match details | ||
| 09.04.24 | 1st round | Stefan Kozlov | Denis Kudla | 6-2, 4-6, 6-2 | | match details | ||
| 08.04.24 | qual. | Stefan Kozlov | Gabi Adrian Boitan | 6-3, 7-610 | | match details | ||
| 07.04.24 | q 1 | Stefan Kozlov | Arthur Gea | 6-4, 7-65 | | match details | ||
| 30.03.24 | q 1 | Denis Yevseyev | Stefan Kozlov | 6-2, 6-0 | | match details | Houston | Clay |
| 25.03.24 | qual. | Roberto Cid Subervi | Stefan Kozlov | 6-2, 6-3 | | match details | San Luis | Clay |
| 24.03.24 | q 1 | Stefan Kozlov | Evan Zhu | 6-0, 6-1 | | match details | ||
| 21.03.24 | 1/4 | Juan Pablo Ficovich | Stefan Kozlov | 7-66, 6-2 | | match details | Merida Challenger | Clay |
| 20.03.24 | 2nd round | Stefan Kozlov | Elmar Ejupovic | 6-3, 6-2 | | match details |
