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 2022
Stefan Kozlov / year 2022
| 14.11.22 | 1st round | Prajnesh Gunneswaran | Stefan Kozlov | 3-6, 6-3, 6-4 |  | match details | Champaign Challenger | I. hard |
| 11.11.22 | 1/4 | Enzo Couacaud | Stefan Kozlov | 6-3, 7-5 | | match details | Knoxville Challenger | I. hard |
| 09.11.22 | 2nd round | Stefan Kozlov | Prajnesh Gunneswaran | 6-4, 6-3 |  | match details | ||
| 07.11.22 | 1st round | Stefan Kozlov | Martin Damm | 6-77, 6-3, 6-2 | | match details | ||
| 03.11.22 | 2nd round | Lucas Gerch | Stefan Kozlov | 6-4, 7-63 | | match details | Charlottesville Challenger | I. hard |
| 01.11.22 | 1st round | Stefan Kozlov | Mitchell Krueger | 7-5, 0-6, 7-61 | | match details | ||
| 30.10.22 | fin | Tennys Sandgren | Stefan Kozlov | 7-5, 6-3 | | match details | Las Vegas | Hard |
| 29.10.22 | 1/2 | Stefan Kozlov | Steve Johnson | 6-3, 1-6, 7-5 | | match details | ||
| 28.10.22 | 1/4 | Stefan Kozlov | Alexis Galarneau | 6-75, 6-4, 6-3 | | match details | ||
| 27.10.22 | 2nd round | Stefan Kozlov | Evan Zhu | 7-65, 6-2 | | match details | ||
| 25.10.22 | 1st round | Stefan Kozlov | Cannon Kingsley | 7-5, 4-6, 6-1 | | match details | ||
| 11.10.22 | 1st round | Sam Riffice | Stefan Kozlov | 3-6, 6-2, 6-3 | | match details | Fairfield Challenger | Hard |
| 06.10.22 | 2nd round | Alexis Galarneau | Stefan Kozlov | 6-1, 7-5 | | match details | Tiburon Challenger | Hard |
| 04.10.22 | 1st round | Stefan Kozlov | Giovanni Oradini | 6-1, 6-4 | | match details | ||
| 19.09.22 | 1st round | Jeff Wolf | Stefan Kozlov | 6-2, 7-66 | | match details | San Diego | Hard |
| 15.09.22 | 2nd round | Yasutaka Uchiyama | Stefan Kozlov | 6-4, 2-0, Stefan Kozlov - retired | | match details | Cary Challenger | Hard |
| 13.09.22 | 1st round | Stefan Kozlov | Cannon Kingsley | 2-6, 6-2, 6-2 | | match details | ||
| 29.08.22 | 1st round | Daniil Medvedev | Stefan Kozlov | 6-2, 6-4, 6-0 | | match details | New York | Hard |
| 13.08.22 | q 1 | Dusan Lajovic | Stefan Kozlov | 6-3, 7-5 | | match details | Cincinnati | Hard |
| 10.08.22 | 1st round | Ernesto Escobedo | Stefan Kozlov | 6-4, 7-62 | | match details | Chicago Challenger | Hard |
| 01.08.22 | 1st round | Jack Draper | Stefan Kozlov | 7-5, 6-2 | | match details | Washington | Hard |
| 23.07.22 | q 1 | Ramkumar Ramanathan | Stefan Kozlov | 6-0, 6-1 | | match details | Atlanta | Hard |
| 18.07.22 | 1st round | Aleksandar Kovacevic | Stefan Kozlov | 6-3, 6-74, 6-4 | | match details | Indianapolis Challenger | I. hard |
| 11.07.22 | 1st round | Steve Johnson | Stefan Kozlov | 7-5, 6-3 | | match details | Newport | Grass |
| 28.06.22 | 1st round | Diego Sebastian Schwartzman | Stefan Kozlov | 6-3, 6-2, 6-2 | | match details |  London | Grass |
| 23.06.22 | qual. | Dennis Novak | Stefan Kozlov | 7-5, 6-4, 5-7, 3-6, 6-3 | | match details | ||
| 22.06.22 | q 2 | Stefan Kozlov | Dominic Stricker | 7-69, 4-6, 6-3 | | match details | ||
| 20.06.22 | q 1 | Stefan Kozlov | Evan Furness | 7-5, 6-3 | | match details | ||
| 11.06.22 | q 1 | Steve Johnson | Stefan Kozlov | 6-0, 6-0 | | match details | London | Grass |
| 04.06.22 | q 1 | Matthew Ebden | Stefan Kozlov | 6-4, 6-4 | | match details |  's-Hertogenbosch | Grass |
| 02.06.22 | 2nd round | Brandon Nakashima | Stefan Kozlov | 6-4, 6-3 | | match details | Surbiton Challenger | Grass |
| 01.06.22 | 1st round | Stefan Kozlov | Mats Moraing | 6-3, 7-64 | | match details | ||
| 17.05.22 | q 1 | Nino Serdarusic | Stefan Kozlov | 7-5, 6-0 | | match details |  Paris | Clay |
| 10.05.22 | 1st round | Jaume Antoni Munar Clar | Stefan Kozlov | 6-2, 6-3 | | match details | Bordeaux Challenger | Clay |
| 26.04.22 | 1st round | Jose Pereira | Stefan Kozlov | 6-1, 6-0 | | match details | Savannah Challenger | Clay |
| 04.04.22 | 1st round | Gerald Melzer | Stefan Kozlov | 6-4, 0-0, Stefan Kozlov - retired | | match details |  Mexico City | Clay |
| 29.03.22 | 1st round | Nicolas Mejia | Stefan Kozlov | 6-1, 6-1 | | match details |  Pereira Challenger | Clay |
| 21.03.22 | q 1 | Mitchell Krueger | Stefan Kozlov | 6-2, 6-2 | | match details | Miami | Hard |
| 09.03.22 | qual. | Holger Rune | Stefan Kozlov | 6-4, 6-2 | | match details | Indian Wells | Hard |
| 08.03.22 | q 1 | Stefan Kozlov | Sebastian Sec | 6-3, 6-74, 6-2 | | match details | ||
| 23.02.22 | 2nd round | Rafael Nadal | Stefan Kozlov | 6-0, 6-3 | | match details | Acapulco | Hard |
| 21.02.22 | 1st round | Stefan Kozlov | Grigor Dimitrov | 7-68, 5-7, 6-3 | | match details | ||
| 20.02.22 | qual. | Oscar Otte | Stefan Kozlov | 6-1, 0-6, 7-62 | | match details | ||
| 19.02.22 | q 1 | Stefan Kozlov | Steve Johnson | 6-4, 6-3 | | match details | ||
| 18.02.22 | 1/4 | Tommy Paul | Stefan Kozlov | 6-3, 6-1 | | match details | Delray Beach | Hard |
| 16.02.22 | 2nd round | Stefan Kozlov | Steve Johnson | 6-1, 6-3 | | match details | ||
| 15.02.22 | 1st round | Stefan Kozlov | Emilio Gomez | 4-6, 7-5, 6-3 | | match details | ||
| 13.02.22 | qual. | Stefan Kozlov | Bjorn Fratangelo | 6-3, 1-0, Bjorn Fratangelo - retired | | match details | ||
| 12.02.22 | q 1 | Stefan Kozlov | Go Soeda | 7-5, 6-2 | | match details | ||
| 26.01.22 | 2nd round | Dominic Stricker | Stefan Kozlov | 4-6, 6-4, 6-3 | | match details | Columbus Challenger | I. hard |
| 24.01.22 | 1st round | Stefan Kozlov | Alexander Bernard | 6-2, 6-1 | | match details | ||
| 19.01.22 | 2nd round | Matteo Berrettini | Stefan Kozlov | 6-1, 4-6, 6-4, 6-1 | | match details |  Melbourne | Hard |
| 17.01.22 | 1st round | Stefan Kozlov | Jiri Vesely | 7-5, 6-3, 6-4 | | match details | ||
| 09.01.22 | q 1 | Denis Kudla | Stefan Kozlov | 4-6, 7-67, 6-3 | | match details | Sydney | Hard |
| 04.01.22 | 2nd round | Flavio Cobolli | Stefan Kozlov | 6-4, 3-6, 6-1 | | match details | Bendigo Challenger | Hard |
