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 2014
Stefan Kozlov / year 2014
| 28.10.14 | 1st round | Peter Torebko | Stefan Kozlov | 6-3, 7-62 |  | match details | Charlottesville Challenger | I. hard |
| 20.10.14 | 1st round | Martin Klizan | Stefan Kozlov | 6-3, 6-3 | | match details |  Valencia | I. hard |
| 05.10.14 | fin | Sam Querrey | Stefan Kozlov | 6-3, 6-4 | | match details | Sacramento Challenger | Hard |
| 04.10.14 | 1/2 | Stefan Kozlov | Tim Smyczek | 3-6, 6-3, 7-61 |  | match details | ||
| 03.10.14 | 1/4 | Stefan Kozlov | Rhyne Williams | 4-6, 7-63, 6-4 | | match details | ||
| 01.10.14 | 2nd round | Stefan Kozlov | John-Patrick Smith | 6-4, 3-6, 6-4 | | match details | ||
| 29.09.14 | 1st round | Stefan Kozlov | Ryan Harrison | 6-1, 3-6, 6-3 | | match details | ||
| 22.09.14 | 2nd round | Kyle Mcmorrow | Stefan Kozlov | 6-1, 6-4 | | match details | USA F26 | Hard |
| 22.09.14 | 1st round | Stefan Kozlov | Patrick Davidson | 6-3, 6-2 | | match details | ||
| 05.09.14 | 1/4 | Quentin Halys | Stefan Kozlov | 3-1, Stefan Kozlov - retired | | match details | U.S. Open | Hard |
| 04.09.14 | 3rd round | Stefan Kozlov | Seongchan Hong | 6-3, 2-6, 6-3 | | match details | ||
| 03.09.14 | 2nd round | Stefan Kozlov | Rafael Matos | 7-62, 6-4 | | match details | ||
| 01.09.14 | 1st round | Stefan Kozlov | Jan Zielinski | 6-2, 6-3 | | match details | ||
| 21.08.14 | q 2 | Borna Coric | Stefan Kozlov | 2-6, 6-2, 6-2 | | match details | New York | Hard |
| 20.08.14 | q 1 | Stefan Kozlov | Mitchell Frank | 3-6, 6-0, 6-2 | | match details | ||
| 26.07.14 | q 1 | Samuel Groth | Stefan Kozlov | 3-6, 7-65, 6-4 | | match details | Washington | Hard |
| 20.07.14 | q 2 | Richard Gabb | Stefan Kozlov | 4-6, 6-3, 6-2 | | match details | Lexington Challenger | Hard |
| 19.07.14 | q 1 | Stefan Kozlov | Cesar Ramirez | 6-4, Cesar Ramirez - retired | | match details | ||
| 06.07.14 | fin | Noah Rubin | Stefan Kozlov | 6-4, 4-6, 6-3 | | match details |  Wimbledon (juniors) | Grass |
| 05.07.14 | 1/2 | Stefan Kozlov | Johan Sebastien Tatlot | 6-3, 7-67 | | match details | ||
| 04.07.14 | 1/4 | Stefan Kozlov | Hyeon Chung | 6-4, 7-66 | | match details | ||
| 03.07.14 | 3rd round | Stefan Kozlov | Naoki Nakagawa | 6-3, 7-62 | | match details | ||
| 02.07.14 | 2nd round | Stefan Kozlov | Pedro Martinez Portero | 6-0, 6-2 | | match details | ||
| 01.07.14 | 1st round | Stefan Kozlov | Rafael Matos | 6-4, 6-1 | | match details | ||
| 05.06.14 | 1/4 | Andrey Rublev | Stefan Kozlov | 7-5, 3-6, 6-4 | | match details |  French Open | Clay |
| 04.06.14 | 3rd round | Stefan Kozlov | Duckhee Lee | 7-64, 6-1 | | match details | ||
| 03.06.14 | 2nd round | Stefan Kozlov | Akira Santillan | 6-3, 6-3 | | match details | ||
| 01.06.14 | 1st round | Stefan Kozlov | Ryotaro Matsumura | 6-4, 6-2 | | match details | ||
| 19.05.14 | 2nd round | Juan Lizariturry | Stefan Kozlov | 6-2, 5-7, 6-4 | | match details | Spain F10 | Clay |
| 19.05.14 | 1st round | Stefan Kozlov | Sergio Martos Gornes | 6-2, 6-3 | | match details | ||
| 28.04.14 | 1st round | Stefan Kozlov | Devin Mccarthy | 6-1, 2-0, Devin Mccarthy - retired | | match details | USA F12 | Clay |
| 28.04.14 | 2nd round | Facundo Mena | Stefan Kozlov | 3-6, 6-3, 6-2 | | match details | ||
| 20.04.14 | q 1 | Eric Quigley | Stefan Kozlov | 4-6, 7-5, 6-3 | | match details | Savannah Challenger | Clay |
| 07.04.14 | 2nd round | Stefan Kozlov | Nicolas Meister | 7-66, 6-2 | | match details | USA F11 | Hard |
| 07.04.14 | 1/2 | Filip Krajinovic | Stefan Kozlov | 3-6, 6-4, 6-3 | | match details | ||
| 07.04.14 | q 2 | Stefan Kozlov | Antony Mendes | 6-0, 6-0 | | match details | ||
| 07.04.14 | qual. | Stefan Kozlov | David Carbo | 6-0, 6-0 | | match details | ||
| 07.04.14 | 1st round | Stefan Kozlov | Catalin-Ionut Gard | 6-3, 6-4 | | match details | ||
| 07.04.14 | 1/4 | Stefan Kozlov | Kyle Mcmorrow | 6-2, 2-6, 6-1 | | match details | ||
| 17.03.14 | 1st round | Stefan Kozlov | Darian King | 6-3, 6-76, 1-0, Darian King - retired | | match details | USA F9 | Hard |
| 17.03.14 | 2nd round | Kyle Mcmorrow | Stefan Kozlov | 6-4, 6-4 | | match details | ||
| 10.03.14 | qual. | Stefan Kozlov | Alejandro Moreno Figueroa | 6-0, 6-4 | | match details | USA F8 | Hard |
| 10.03.14 | 1st round | Darian King | Stefan Kozlov | 6-4, 7-60 | | match details | ||
| 10.03.14 | q 2 | Stefan Kozlov | Jc Aragone | 6-3, 7-5 | | match details | ||
| 04.03.14 | q 1 | Samuel Groth | Stefan Kozlov | 6-3, 6-4 | | match details | Indian Wells | Hard |
| 15.02.14 | q 1 | Sekou Bangoura | Stefan Kozlov | 6-2, 4-6, 6-3 | | match details | Delray Beach | Hard |
| 25.01.14 | fin | Alexander Zverev | Stefan Kozlov | 6-3, 6-0 | | match details |  Australian Open | Hard |
| 24.01.14 | 1/2 | Stefan Kozlov | Quentin Halys | 2-6, 7-63, 6-3 | | match details | ||
| 23.01.14 | 1/4 | Stefan Kozlov | Andrey Rublev | 6-2, 6-1 | | match details | ||
| 22.01.14 | 3rd round | Stefan Kozlov | Boris Pokotilov | 6-1, 6-2 | | match details | ||
| 20.01.14 | 2nd round | Stefan Kozlov | Simon Friis Soendergaard | 6-78, 7-5, 6-0 | | match details | ||
| 19.01.14 | 1st round | Stefan Kozlov | Blake Mott | 7-65, 4-6, 6-5, Blake Mott - retired | | match details |
