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 2017
Stefan Kozlov / year 2017
| 08.11.17 | 1st round | Tim Smyczek | Stefan Kozlov | 7-63, 6-2 |  | match details | Knoxville Challenger | I. hard |
| 04.11.17 | 1/2 | Tim Smyczek | Stefan Kozlov | 6-3, 2-6, 6-2 | | match details | Charlottesville Challenger | I. hard |
| 03.11.17 | 1/4 | Stefan Kozlov | Denis Kudla | 6-4, 6-3 |  | match details | ||
| 02.11.17 | 2nd round | Stefan Kozlov | Liam Broady | 6-4, 4-6, 6-4 | | match details | ||
| 31.10.17 | 1st round | Stefan Kozlov | Thai Kwiatkowski | 6-1, 3-6, 6-3 | | match details | ||
| 22.10.17 | fin | Stefan Kozlov | Liam Broady | 3-6, 7-5, 6-4 | | match details | Las Vegas | Hard |
| 21.10.17 | 1/2 | Stefan Kozlov | Tennys Sandgren | 6-3, 7-66 | | match details | ||
| 20.10.17 | 1/4 | Stefan Kozlov | Kevin King | 6-2, 6-3 | | match details | ||
| 18.10.17 | 2nd round | Stefan Kozlov | Dominik Koepfer | 6-4, 6-1 | | match details | ||
| 16.10.17 | 1st round | Stefan Kozlov | Jc Aragone | 7-5, 6-3 | | match details | ||
| 10.10.17 | 1st round | Mackenzie Mcdonald | Stefan Kozlov | 6-4, 5-7, 6-1 | | match details | Fairfield Challenger | Hard |
| 06.10.17 | 1/4 | Darian King | Stefan Kozlov | 6-4, 6-4 | | match details | Stockton Challenger | Hard |
| 04.10.17 | 2nd round | Stefan Kozlov | Denis Kudla | 6-4, 6-4 | | match details | ||
| 02.10.17 | 1st round | Stefan Kozlov | Brayden Schnur | 6-3, 6-2 | | match details | ||
| 22.08.17 | q 1 | Guido Andreozzi | Stefan Kozlov | 6-4, 6-1 | | match details | New York | Hard |
| 14.08.17 | 1st round | Sam Querrey | Stefan Kozlov | 6-3, 6-0 | | match details | Cincinnati | Hard |
| 31.07.17 | 1st round | Yuki Bhambri | Stefan Kozlov | 7-5, 2-0, Stefan Kozlov - retired | | match details | Washington | Hard |
| 24.07.17 | 1st round | Quentin Halys | Stefan Kozlov | 7-5, 7-67 | | match details | Atlanta | Hard |
| 23.07.17 | qual. | Stefan Kozlov | Brydan Klein | 6-79, 6-2, 7-64 | | match details | ||
| 22.07.17 | q 1 | Stefan Kozlov | Catalin-Ionut Gard | 6-3, 6-1 | | match details | ||
| 17.07.17 | 1st round | Adrian Menendez-Maceiras | Stefan Kozlov | 6-2, 7-65 | | match details | Newport | Grass |
| 28.06.17 | q 2 | Dennis Novikov | Stefan Kozlov | 7-5, 6-2 | | match details |  London | Grass |
| 26.06.17 | q 1 | Stefan Kozlov | Marc Polmans | 6-4, 7-5 | | match details | ||
| 22.06.17 | 2nd round | Marin Cilic | Stefan Kozlov | 6-0, 6-4 | | match details | London | Grass |
| 20.06.17 | 1st round | Stefan Kozlov | Steve Johnson | 3-6, 6-1, 6-1 | | match details | ||
| 18.06.17 | qual. | Stefan Kozlov | Pierre-Hugues Herbert | 6-4, 6-2 | | match details | ||
| 17.06.17 | q 1 | Stefan Kozlov | Kenny de Schepper | 6-74, 6-3, 6-4 | | match details | ||
| 15.06.17 | 2nd round | Ivo Karlovic | Stefan Kozlov | 6-4, 6-1 | | match details |  's-Hertogenbosch | Grass |
| 13.06.17 | 1st round | Stefan Kozlov | Dustin Brown | 6-3, 3-6, 6-3 | | match details | ||
| 08.06.17 | 1st round | Akira Santillan | Stefan Kozlov | 6-2, 2-6, 6-3 | | match details | Surbiton Challenger | Grass |
| 24.05.17 | q 2 | Sergiy Stakhovsky | Stefan Kozlov | 6-75, 6-4, 6-4 | | match details |  Paris | Clay |
| 22.05.17 | q 1 | Stefan Kozlov | Corentin Moutet | 2-6, 7-5, 6-4 | | match details | ||
| 15.05.17 | 1st round | Tobias Kamke | Stefan Kozlov | 6-4, 5-7, 7-64 | | match details |  Heilbronn Challenger | Clay |
| 05.05.17 | 1/4 | Joao Pedro Sorgi | Stefan Kozlov | 6-2, 6-2 | | match details | Savannah Challenger | Clay |
| 04.05.17 | 2nd round | Stefan Kozlov | Ramkumar Ramanathan | 6-1, 6-2 | | match details | ||
| 02.05.17 | 1st round | Stefan Kozlov | Mikelis Libietis | 6-3, 6-4 | | match details | ||
| 27.04.17 | 1/4 | Mitchell Krueger | Stefan Kozlov | 6-4, 7-5 | | match details | Tallahassee Challenger | Clay |
| 26.04.17 | 2nd round | Stefan Kozlov | Jurgen Melzer | 2-6, 6-3, 6-4 | | match details | ||
| 25.04.17 | 1st round | Stefan Kozlov | Federico Coria | 6-3, 4-6, 6-4 | | match details | ||
| 20.04.17 | 2nd round | Horacio Zeballos | Stefan Kozlov | 6-1, 7-63 | | match details | Sarasota Challenger | Clay |
| 18.04.17 | 1st round | Stefan Kozlov | Peter Polansky | 6-4, 6-4 | | match details | ||
| 17.04.17 | qual. | Blaz Rola | Stefan Kozlov | 2-6, 6-4, 6-2 | | match details | ||
| 16.04.17 | q 2 | Stefan Kozlov | Axel Geller | 6-1, 6-2 | | match details | ||
| 15.04.17 | q 1 | Stefan Kozlov | Sathi Reddy Chirala | 6-0, 6-0 | | match details | ||
| 12.04.17 | 1st round | Miomir Kecmanovic | Stefan Kozlov | 6-2, 7-5 | | match details |  San Luis | Clay |
| 03.04.17 | 1st round | Blaz Rola | Stefan Kozlov | 6-1, 7-66 | | match details |  Panama City | Clay |
| 30.03.17 | 2nd round | Rajeev Ram | Stefan Kozlov | 6-1, 7-64 | | match details | Leon Challenger | Hard |
| 29.03.17 | 1st round | Stefan Kozlov | Danilo Petrovic | 6-4, 6-2 | | match details | ||
| 21.03.17 | qual. | Jared Donaldson | Stefan Kozlov | 7-5, 6-3 | | match details | Miami | Hard |
| 20.03.17 | q 1 | Stefan Kozlov | Nicola Kuhn | 6-3, 3-6, 6-3 | | match details | ||
| 10.03.17 | 1st round | Donald Young | Stefan Kozlov | 7-5, 7-65 | | match details | Indian Wells | Hard |
| 27.02.17 | 1st round | Ernesto Escobedo | Stefan Kozlov | 6-1, 2-6, 6-0 | | match details | Acapulco | Hard |
| 26.02.17 | qual. | Stefan Kozlov | Jared Donaldson | 7-5, 6-3 | | match details | ||
| 25.02.17 | q 1 | Stefan Kozlov | Hyeon Chung | 6-2, 6-2 | | match details | ||
| 21.02.17 | 1st round | Steve Johnson | Stefan Kozlov | 6-1, 6-4 | | match details | Delray Beach | Hard |
| 17.02.17 | 1/4 | Teimuraz Gabashvili | Stefan Kozlov | 6-3, 6-1 | | match details | Tempe Challenger | Hard |
| 15.02.17 | 2nd round | Stefan Kozlov | Roberto Quiroz | 6-4, 7-65 | | match details | ||
| 13.02.17 | 1st round | Stefan Kozlov | Bradley Klahn | 6-1, 7-5 | | match details | ||
| 11.01.17 | q 1 | Yuki Bhambri | Stefan Kozlov | 6-1, 6-4 | | match details |  Melbourne | Hard |
| 31.12.16 | q 1 | John-Patrick Smith | Stefan Kozlov | 6-2, 6-3 | | match details | Brisbane | Hard |
