Match log updated: 2026-08-30 18:41 UTC
Stefan Kozlov — ATP Match Log
Main draw matches: 35 | W: 9 | L: 26 | Win %: 25.7%
| Opponent | Score | Result | H2H | Match Data | Date ↑ | Round | Tournament | Category | Surface |
|---|---|---|---|---|---|---|---|---|---|
| Michal Przysiezny | 3-6 7-6(9) 4-6 | L | H2H | Match data | Jul 11, 2013* | R32 | Newport | ATP 250 | Grass |
| Sekou Bangoura | 2-6 6-4 3-6 | L | H2H | Match data | Feb 17, 2014 | Q1 | Delray Beach Open | ATP 250 | Hard |
| Sam Groth | 3-6 4-6 | L | H2H | Match data | Mar 6, 2014 | Q1 | Indian Wells Open | Masters 1000 | Hard |
| Sam Groth | 6-3 6-7(5) 4-6 | L | H2H | Match data | Jul 28, 2014 | Q1 | Washington Open | ATP 500 | Hard |
| Mitchell Frank | 3-6 6-0 6-2 | W | H2H | Match data | Aug 25, 2014 | Q1 | US Open | Grand Slam | Hard |
| Borna Coric | 6-2 2-6 2-6 | L | H2H | Match data | Aug 26, 2014* | Q2 | US Open | Grand Slam | Hard |
| Martin Klizan | 3-6 3-6 | L | H2H | Match data | Oct 23, 2014* | R32 | Valencia | ATP 500 | Hard |
| Jared Donaldson | 5-7 0-6 | L | H2H | Match data | Feb 12, 2015* | R32 | Memphis | ATP 250 | Hard |
| Tim Smyczek | 5-7 2-6 | L | H2H | Match data | Feb 19, 2015* | R32 | Delray Beach Open | ATP 250 | Hard |
| Yen-Hsun Lu | 4-6 3-6 | L | H2H | Match data | Aug 16, 2015 | Q1 | Cincinnati Open | Masters 1000 | Hard |
| Guido Andreozzi | 2-6 7-5 3-6 | L | H2H | Match data | Aug 31, 2015 | Q1 | US Open | Grand Slam | Hard |
| Grega Zemlja | 6-3 3-6 1-6 | L | H2H | Match data | May 22, 2016* | Q1 | Roland Garros | Grand Slam | Clay |
| Yoshihito Nishioka | 6-1 2-6 6-3 | W | H2H | Match data | Jun 9, 2016* | R32 | Libéma Open | ATP 250 | Grass |
| Steve Johnson | 6-3 6-4 | W | H2H | Match data | Jun 11, 2016* | R16 | Libéma Open | ATP 250 | Grass |
| Sam Querrey | 3-6 0-6 | L | H2H | Match data | Jun 12, 2016* | QF | Libéma Open | ATP 250 | Grass |
| Vasek Pospisil | 6-7(5) 6-7(6) | L | H2H | Match data | Jun 13, 2016 | Q1 | Queen's Club Championships | ATP 500 | Grass |
| Daniil Medvedev | 2-6 2-6 | L | H2H | Match data | Jun 27, 2016 | Q1 | Wimbledon | Grand Slam | Grass |
| Benjamin Becker | 6-1 6-2 | W | H2H | Match data | Jul 14, 2016* | R32 | Newport | ATP 250 | Grass |
| Donald Young | 0-6 4-6 | L | H2H | Match data | Jul 15, 2016* | R16 | Newport | ATP 250 | Grass |
| Damir Dzumhur | 6-4 3-6 7-5 | W | H2H | Match data | Aug 14, 2016* | Q1 | Cincinnati Open | Masters 1000 | Hard |
| Malek Jaziri | 4-6 2-6 | L | H2H | Match data | Aug 14, 2016* | Q2 | Cincinnati Open | Masters 1000 | Hard |
| Michael Berrer | 6-2 6-7(5) 2-6 | L | H2H | Match data | Aug 29, 2016 | Q1 | US Open | Grand Slam | Hard |
| John-Patrick Smith | 2-6 3-6 | L | H2H | Match data | Jan 1, 2017* | Q1 | Brisbane International | ATP 250 | Hard |
| Yuki Bhambri | 1-6 4-6 | L | H2H | Match data | Jan 16, 2017 | Q1 | Australian Open | Grand Slam | Hard |
| Steve Johnson | 1-6 4-6 | L | H2H | Match data | Feb 23, 2017* | R32 | Delray Beach Open | ATP 250 | Hard |
| Hyeon Chung | 6-2 6-2 | W | H2H | Match data | Feb 27, 2017 | Q1 | Mexican Open | ATP 500 | Hard |
| Jared Donaldson | 7-5 6-3 | W | H2H | Match data | Feb 27, 2017 | Q2 | Mexican Open | ATP 500 | Hard |
| Ernesto Escobedo | 1-6 6-2 0-6 | L | H2H | Match data | Mar 1, 2017* | R32 | Mexican Open | ATP 500 | Hard |
| Donald Young | 5-7 6-7(5) | L | H2H | Match data | Mar 11, 2017* | R128 | Indian Wells Open | Masters 1000 | Hard |
| Nicola Kuhn | 6-3 3-6 6-3 | W | H2H | Match data | Mar 22, 2017* | Q1 | Miami Open | Masters 1000 | Hard |
| Jared Donaldson | 5-7 3-6 | L | H2H | Match data | Mar 23, 2017* | Q2 | Miami Open | Masters 1000 | Hard |
| Corentin Moutet | 2-6 7-5 6-4 | W | H2H | Match data | May 28, 2017* | Q1 | Roland Garros | Grand Slam | Clay |
| Sergiy Stakhovsky | 7-6(5) 4-6 4-6 | L | H2H | Match data | May 29, 2017 | Q2 | Roland Garros | Grand Slam | Clay |
| Dustin Brown | 6-3 3-6 6-3 | W | H2H | Match data | Jun 15, 2017* | R32 | Libéma Open | ATP 250 | Grass |
| Ivo Karlovic | 4-6 1-6 | L | H2H | Match data | Jun 16, 2017* | R16 | Libéma Open | ATP 250 | Grass |
| Kenny De Schepper | 6-7(4) 6-3 6-4 | W | H2H | Match data | Jun 19, 2017 | Q1 | Queen's Club Championships | ATP 500 | Grass |
| Pierre-Hugues Herbert | 6-4 6-2 | W | H2H | Match data | Jun 19, 2017 | Q2 | Queen's Club Championships | ATP 500 | Grass |
| Steve Johnson | 3-6 6-1 6-1 | W | H2H | Match data | Jun 22, 2017* | R32 | Queen's Club Championships | ATP 500 | Grass |
| Marin Cilic | 0-6 4-6 | L | H2H | Match data | Jun 23, 2017* | R16 | Queen's Club Championships | ATP 500 | Grass |
| Marc Polmans | 6-4 7-5 | W | H2H | Match data | Jul 3, 2017 | Q1 | Wimbledon | Grand Slam | Grass |
| Dennis Novikov | 5-7 2-6 | L | H2H | Match data | Jul 4, 2017* | Q2 | Wimbledon | Grand Slam | Grass |
| Adrian Menendez Maceiras | 2-6 6-7(5) | L | — | Match data | Jul 20, 2017* | R32 | Newport | ATP 250 | Grass |
| Catalin-Ionut Gard | 6-3 6-1 | W | H2H | Match data | Jul 24, 2017 | Q1 | Atlanta | ATP 250 | Hard |
| Brydan Klein | 6-7(9) 6-2 7-6(4) | W | H2H | Match data | Jul 24, 2017 | Q2 | Atlanta | ATP 250 | Hard |
| Quentin Halys | 5-7 6-7(7) | L | H2H | Match data | Jul 27, 2017* | R32 | Atlanta | ATP 250 | Hard |
| Yuki Bhambri | 5-7 0-2 (ret.) | L | H2H | Match data | Aug 2, 2017* | R64 | Washington Open | ATP 500 | Hard |
| Sam Querrey | 3-6 0-6 | L | H2H | Match data | Aug 15, 2017* | R64 | Cincinnati Open | Masters 1000 | Hard |
| Guido Andreozzi | 4-6 1-6 | L | H2H | Match data | Aug 28, 2017 | Q1 | US Open | Grand Slam | Hard |
| Blake Ellis | 7-6(3) 4-6 7-6(3) | W | H2H | Match data | Jan 15, 2018 | Q1 | Australian Open | Grand Slam | Hard |
| Yannick Hanfmann | 4-6 7-6(2) 6-4 | W | H2H | Match data | Jan 16, 2018* | Q2 | Australian Open | Grand Slam | Hard |
| Dustin Brown | 4-6 6-3 3-6 | L | H2H | Match data | Jan 16, 2018* | Q3 | Australian Open | Grand Slam | Hard |
| Ramkumar Ramanathan | 3-6 2-6 | L | H2H | Match data | Feb 19, 2018 | Q1 | Delray Beach Open | ATP 250 | Hard |
| Adrian Menendez Maceiras | 2-6 6-7(8) | L | — | Match data | Mar 8, 2018* | Q1 | Indian Wells Open | Masters 1000 | Hard |
| Cameron Norrie | 1-6 0-2 (ret.) | L | H2H | Match data | Mar 21, 2018* | Q1 | Miami Open | Masters 1000 | Hard |
| Thomaz Bellucci | 6-7(3) 6-3 7-6(5) | W | H2H | Match data | Apr 9, 2018 | Q1 | U.S. Men's Clay Court Championship | ATP 250 | Clay |
| Akira Santillan | 6-2 6-0 | W | H2H | Match data | Apr 9, 2018 | Q2 | U.S. Men's Clay Court Championship | ATP 250 | Clay |
| Guido Pella | 3-6 2-6 | L | H2H | Match data | Apr 12, 2018* | R32 | U.S. Men's Clay Court Championship | ATP 250 | Clay |
| Yasutaka Uchiyama | 4-6 5-7 | L | H2H | Match data | May 27, 2018* | Q1 | Roland Garros | Grand Slam | Clay |
| Dustin Brown | 6-3 6-1 | W | H2H | Match data | Jul 2, 2018 | Q1 | Wimbledon | Grand Slam | Grass |
| Yannick Maden | 1-6 3-6 | L | H2H | Match data | Jul 3, 2018* | Q2 | Wimbledon | Grand Slam | Grass |
| Jared Hiltzik | 3-6 3-6 | L | H2H | Match data | Jul 30, 2018 | Q1 | Washington Open | ATP 500 | Hard |
| Egor Gerasimov | 4-6 4-6 | L | H2H | Match data | Aug 26, 2019 | Q1 | US Open | Grand Slam | Hard |
| Alex Bolt | 4-6 6-4 6-2 | W | H2H | Match data | Feb 17, 2020 | Q1 | Delray Beach Open | ATP 250 | Hard |
| Emilio Gomez | 3-6 2-6 | L | H2H | Match data | Feb 17, 2020 | Q2 | Delray Beach Open | ATP 250 | Hard |
| Ugo Humbert | 7-6(5) 3-6 1-6 | L | H2H | Match data | Feb 20, 2020* | R32 | Delray Beach Open | ATP 250 | Hard |
| Johannes Haerteis | 5-0 (ret.) | W | H2H | Match data | Jan 7, 2021* | Q1 | Delray Beach Open | ATP 250 | Hard |
| Donald Young | 6-4 4-6 4-6 | L | H2H | Match data | Jan 7, 2021* | Q2 | Delray Beach Open | ATP 250 | Hard |
| Jordi Arconada | 6-4 6-1 | W | — | Match data | Mar 15, 2021 | Q1 | Mexican Open | ATP 500 | Hard |
| Joao Sousa | 6-2 2-6 6-3 | W | H2H | Match data | Mar 15, 2021 | Q2 | Mexican Open | ATP 500 | Hard |
| Botic van de Zandschulp | 6-3 1-0 (ret.) | W | H2H | Match data | Mar 16, 2021* | Q3 | Mexican Open | ATP 500 | Hard |
| Cameron Norrie | 3-6 3-6 | L | H2H | Match data | Mar 17, 2021* | R32 | Mexican Open | ATP 500 | Hard |
| Bernabe Zapata Miralles | 5-7 6-1 3-6 | L | H2H | Match data | Aug 30, 2021 | Q1 | US Open | Grand Slam | Hard |
| Jason Jung | 6-3 3-6 5-2 (ret.) | W | H2H | Match data | Oct 7, 2021* | Q1 | Indian Wells Open | Masters 1000 | Hard |
| Christopher Eubanks | 6-2 0-6 5-7 | L | H2H | Match data | Oct 8, 2021* | Q2 | Indian Wells Open | Masters 1000 | Hard |
| Denis Kudla | 6-4 6-7(7) 3-6 | L | H2H | Match data | Jan 10, 2022 | Q1 | Sydney International | ATP 250 | Hard |
| Jiri Vesely | 7-5 6-3 6-4 | W | H2H | Match data | Jan 19, 2022* | R128 | Australian Open | Grand Slam | Hard |
| Matteo Berrettini | 1-6 6-4 4-6 1-6 | L | H2H | Match data | Jan 20, 2022* | R64 | Australian Open | Grand Slam | Hard |
| Go Soeda | 7-5 6-2 | W | H2H | Match data | Feb 14, 2022 | Q1 | Delray Beach Open | ATP 250 | Hard |
| Bjorn Fratangelo | 6-3 1-0 (ret.) | W | H2H | Match data | Feb 14, 2022 | Q2 | Delray Beach Open | ATP 250 | Hard |
| Emilio Gomez | 4-6 7-5 6-3 | W | H2H | Match data | Feb 17, 2022* | R32 | Delray Beach Open | ATP 250 | Hard |
| Steve Johnson | 6-1 6-3 | W | H2H | Match data | Feb 18, 2022* | R16 | Delray Beach Open | ATP 250 | Hard |
| Tommy Paul | 3-6 1-6 | L | H2H | Match data | Feb 19, 2022* | QF | Delray Beach Open | ATP 250 | Hard |
| Steve Johnson | 6-4 6-3 | W | H2H | Match data | Feb 21, 2022 | Q1 | Mexican Open | ATP 500 | Hard |
| Oscar Otte | 1-6 6-0 6-7(2) | L | H2H | Match data | Feb 21, 2022 | Q2 | Mexican Open | ATP 500 | Hard |
| Grigor Dimitrov | 7-6(8) 5-7 6-3 | W | H2H | Match data | Feb 23, 2022* | R32 | Mexican Open | ATP 500 | Hard |
| Rafael Nadal | 0-6 3-6 | L | H2H | Match data | Feb 24, 2022* | R16 | Mexican Open | ATP 500 | Hard |
| Sebastian Sec | 6-3 6-7(4) 6-2 | W | H2H | Match data | Mar 10, 2022* | Q1 | Indian Wells Open | Masters 1000 | Hard |
| Holger Rune | 4-6 2-6 | L | H2H | Match data | Mar 11, 2022* | Q2 | Indian Wells Open | Masters 1000 | Hard |
| Mitchell Krueger | 2-6 2-6 | L | H2H | Match data | Mar 23, 2022* | Q1 | Miami Open | Masters 1000 | Hard |
| Nino Serdarusic | 5-7 0-6 | L | H2H | Match data | May 22, 2022* | Q1 | Roland Garros | Grand Slam | Clay |
| Matthew Ebden | 4-6 4-6 | L | H2H | Match data | Jun 6, 2022 | Q1 | Libéma Open | ATP 250 | Grass |
| Steve Johnson | 0-6 0-6 | L | H2H | Match data | Jun 13, 2022 | Q1 | Queen's Club Championships | ATP 500 | Grass |
| Evan Furness | 7-5 6-3 | W | H2H | Match data | Jun 27, 2022 | Q1 | Wimbledon | Grand Slam | Grass |
| Dominic Stricker | 7-6(9) 4-6 6-3 | W | H2H | Match data | Jun 28, 2022* | Q2 | Wimbledon | Grand Slam | Grass |
| Dennis Novak | 5-7 4-6 7-5 6-3 3-6 | L | H2H | Match data | Jun 28, 2022* | Q3 | Wimbledon | Grand Slam | Grass |
| Diego Schwartzman | 3-6 2-6 2-6 | L | H2H | Match data | Jun 29, 2022* | R128 | Wimbledon | Grand Slam | Grass |
| Steve Johnson | 5-7 3-6 | L | H2H | Match data | Jul 14, 2022* | R32 | Newport | ATP 250 | Grass |
| Ramkumar Ramanathan | 0-6 1-6 | L | H2H | Match data | Jul 25, 2022 | Q1 | Atlanta | ATP 250 | Hard |
| Jack Draper | 5-7 2-6 | L | H2H | Match data | Aug 3, 2022* | R64 | Washington Open | ATP 500 | Hard |
| Dusan Lajovic | 3-6 5-7 | L | H2H | Match data | Aug 14, 2022* | Q1 | Cincinnati Open | Masters 1000 | Hard |
| Daniil Medvedev | 2-6 4-6 0-6 | L | H2H | Match data | Aug 31, 2022* | R128 | US Open | Grand Slam | Hard |
| J.J. Wolf | 2-6 6-7(6) | L | H2H | Match data | Sep 22, 2022* | R32 | San Diego | ATP 250 | Hard |
| Oleksii Krutykh | 5-7 2-6 | L | H2H | Match data | Jan 16, 2023 | Q1 | Australian Open | Grand Slam | Hard |
| Thai-Son Kwiatkowski | 6-3 6-4 | W | H2H | Match data | Feb 6, 2023 | Q1 | Dallas Open | ATP 250 | Hard |
| Zachary Svajda | 3-6 4-6 | L | H2H | Match data | Feb 6, 2023 | Q2 | Dallas Open | ATP 250 | Hard |
| Matija Pecotic | 6-7(1) 5-5 (ret.) | L | H2H | Match data | Feb 13, 2023 | Q1 | Delray Beach Open | ATP 250 | Hard |
| Roberto Marcora | 1-6 3-6 | L | H2H | Match data | Mar 8, 2023* | Q1 | Indian Wells Open | Masters 1000 | Hard |
| Inaki Montes De La Torre | 6-3 1-6 3-6 | L | — | Match data | Aug 20, 2023* | Q1 | Winston-Salem Open | ATP 250 | Hard |
| Shintaro Mochizuki | 3-6 6-7(2) | L | H2H | Match data | Feb 12, 2024 | Q1 | Delray Beach Open | ATP 250 | Hard |
| Denis Yevseyev | 2-6 0-6 | L | H2H | Match data | Apr 1, 2024 | Q1 | U.S. Men's Clay Court Championship | ATP 250 | Clay |
| Zachary Svajda | 3-6 0-6 | L | H2H | Match data | Feb 10, 2025* | Q1 | Delray Beach Open | ATP 250 | Hard |
| Duarte Vale | 6-1 6-4 | W | H2H | Match data | Feb 24, 2025* | Q1 | Mexican Open | ATP 500 | Hard |
| Nishesh Basavareddy | 2-6 4-6 | L | H2H | Match data | Feb 24, 2025* | Q2 | Mexican Open | ATP 500 | Hard |
| Patrick Kypson | 6-7(3) 0-6 | L | H2H | Match data | Feb 21, 2026 | Q1 | Mexican Open | ATP 500 | Hard |
| Zachary Svajda | 5-7 1-6 | L | H2H | Match data | Jul 25, 2026 | Q1 | Washington Open | ATP 500 | Hard |
80 qualifying matches shown in the table; qualifying is excluded from main-draw summaries and leaderboards. Estimated from the tournament schedule where an exact match date is unavailable. Arrows show an edition's recorded category and documented modern equivalent; unresolved editions keep their recorded category. Mapping details.