Steve Johnson6 meetings, finals 0-0
3-3All square
Last: Jul 11, 2022, Cerity Partners Hall of Fame Open for the Van Alen Cup Round 1, lost
TennisATPRight-handed
Stefan Kozlov
United StatesAge, ranking and resultsStefan Kozlov is a tennis player on the ATP Tour who represents the United States and reached a career-high ranking of No. 103.
Updated
About Stefan Kozlov
Stefan Kozlov is a tennis player on the ATP Tour who represents the United States. Born on February 1, 1998, in Skopje, Republic of Macedonia, he plays right-handed with a two-handed backhand. Kozlov turned pro in 2013, and his coach is Andrei Kozlov. On July 18, 2022, he reached a career-high ATP Tour ranking of No. 103.
Agatha Research DeskUpdated Oct 5, 2026Match history38
Every ATP Tour, Grand Slam and Olympic main-draw match in our records, newest first. A walkover is listed but never counted in a record.
2026: 0-2
| Date | Tournament | Round | Opponent | Result | Score | Surface |
|---|---|---|---|---|---|---|
| Jul 25 | Mubadala DC Open | Qualifying 1st Round | Zachary Svajda | L | 5-7, 1-6 | Hard |
| Feb 21 | Abierto Mexicano Telcel presentado por HSBC | Qualifying 1st Round | Patrick Kypson | L | 6-7(3), 0-6 | Hard |
2025: 1-2
| Date | Tournament | Round | Opponent | Result | Score | Surface |
|---|---|---|---|---|---|---|
| Feb 23 | Abierto Mexicano Telcel presentado por HSBC | Qualifying Final | Nishesh Basavareddy | L | 2-6, 4-6 | Hard |
| Feb 22 | Abierto Mexicano Telcel presentado por HSBC | Qualifying 1st Round | Duarte Vale | W | 6-1, 6-4 | Hard |
| Feb 8 | Delray Beach Open | Qualifying 1st Round | Zachary Svajda | L | 3-6, 0-6 | Hard |
2024: 0-2
| Date | Tournament | Round | Opponent | Result | Score | Surface |
|---|---|---|---|---|---|---|
| Mar 30 | Fayez Sarofim & Co. U.S. Men's Clay Court Championship | Qualifying 1st Round | Denis Yevseyev | L | 2-6, 0-6 | Clay |
| Feb 11 | Delray Beach Open | Qualifying 1st Round | Shintaro Mochizuki | L | 3-6, 6-7(2) | Hard |
2023: 1-5
| Date | Tournament | Round | Opponent | Result | Score | Surface |
|---|---|---|---|---|---|---|
| Aug 19 | Winston-Salem Open | Qualifying 1st Round | Inaki Montes-De La Torre | L | 6-3, 1-6, 3-6 | Hard |
| Mar 6 | Indian Wells | Qualifying 1st Round | Roberto Marcora | L | 1-6, 3-6 | Hard |
| Feb 11 | Delray Beach Open | Qualifying 1st Round | Matija Pecotic | L | 6-7(1), 5-5 ret. (ret.) | Hard |
| Feb 6 | Nexo Dallas Open | Qualifying Final | Zachary Svajda | L | 3-6, 4-6 | Hard |
| Feb 5 | Nexo Dallas Open | Qualifying 1st Round | Thai-Son Kwiatkowski | W | 6-3, 6-4 | Hard |
| Jan 8 | Australian Open | Qualifying 1st Round | Oleksii Krutykh | L | 5-7, 2-6 | Hard |
2022: 9-17
| Date | Tournament | Round | Opponent | Result | Score | Surface |
|---|---|---|---|---|---|---|
| Sep 19 | Cymbiotika San Diego Open | Round 1 | J.J. Wolf | L | 2-6, 6-7(6) | Hard |
| Aug 29 | US Open | Round 1 | Daniil Medvedev | L | 2-6, 4-6, 0-6 | Hard |
| Aug 13 | Cincinnati Open | Qualifying 1st Round | Dusan Lajovic | L | 3-6, 5-7 | Hard |
| Aug 1 | Mubadala DC Open | Round 1 | Jack Draper | L | 5-7, 2-6 | Hard |
| Jul 23 | Atlanta Open | Qualifying 1st Round | Ramkumar Ramanathan | L | 0-6, 1-6 | Hard |
| Jul 11 | Cerity Partners Hall of Fame Open for the Van Alen Cup | Round 1 | Steve Johnson | L | 5-7, 3-6 | Grass |
| Jun 28 | Wimbledon | Round 1 | Diego Schwartzman | L | 3-6, 2-6, 2-6 | Grass |
| Jun 23 | Wimbledon | Qualifying Final | Dennis Novak | L | 5-7, 4-6, 7-5, 6-3, 3-6 | Grass |
| Jun 22 | Wimbledon | Qualifying 2nd Round | Dominic Stricker | W | 7-6(9), 4-6, 6-3 | Grass |
| Jun 20 | Wimbledon | Qualifying 1st Round | Evan Furness | W | 7-5, 6-3 | Grass |
| Jun 11 | Queen's Club | Qualifying 1st Round | Steve Johnson | L | 0-6, 0-6 | Grass |
| Jun 4 | Libema Open | Qualifying 1st Round | Matthew Ebden | L | 4-6, 4-6 | Grass |
Show 14 more
| May 17 | Roland Garros | Qualifying 1st Round | Nino Serdarusic | L | 5-7, 0-6 | Clay |
| Mar 21 | Miami Open | Qualifying 1st Round | Mitchell Krueger | L | 2-6, 2-6 | Hard |
| Mar 9 | Indian Wells | Qualifying Final | Holger Rune | L | 4-6, 2-6 | Hard |
| Mar 8 | Indian Wells | Qualifying 1st Round | Sebastian Sec | W | 6-3, 6-7(4), 6-2 | Hard |
| Feb 23 | Abierto Mexicano Telcel presentado por HSBC | Round 2 | Rafael Nadal | L | 0-6, 3-6 | Hard |
| Feb 21 | Abierto Mexicano Telcel presentado por HSBC | Round 1 | Grigor Dimitrov | W | 7-6(8), 5-7, 6-3 | Hard |
| Feb 18 | Delray Beach Open | Quarterfinal | Tommy Paul | L | 3-6, 1-6 | Hard |
| Feb 16 | Delray Beach Open | Round 2 | Steve Johnson | W | 6-1, 6-3 | Hard |
| Feb 15 | Delray Beach Open | Round 1 | Emilio Gomez | W | 4-6, 7-5, 6-3 | Hard |
| Feb 13 | Delray Beach Open | Qualifying Final | Bjorn Fratangelo | L | 6-3, 1-0 ret. (ret.) | Hard |
| Feb 13 | Delray Beach Open | Qualifying Final | Bjorn Fratangelo | W | 6-3, 1-0 ret. (ret.) | Hard |
| Feb 12 | Delray Beach Open | Qualifying 1st Round | Go Soeda | W | 7-5, 6-2 | Hard |
| Jan 18 | Australian Open | Round 2 | Matteo Berrettini | L | 1-6, 6-4, 4-6, 1-6 | Hard |
| Jan 16 | Australian Open | Round 1 | Jiri Vesely | W | 7-5, 6-3, 6-4 | Hard |
2021: 0-2
| Date | Tournament | Round | Opponent | Result | Score | Surface |
|---|---|---|---|---|---|---|
| Aug 24 | US Open | Bernabe Zapata Miralles | L | 5-7, 6-1, 3-6 | Hard | |
| Mar 16 | Abierto Mexicano Telcel presentado por HSBC | Round 1 | Cameron Norrie | L | 3-6, 3-6 | Hard |
2020: 0-1
| Date | Tournament | Round | Opponent | Result | Score | Surface |
|---|---|---|---|---|---|---|
| Feb 18 | Delray Beach Open by Vitacost.com | Round 1 | Ugo Humbert | L | 7-6(5), 3-6, 1-6 | Hard |
2018: 1-1
| Date | Tournament | Round | Opponent | Result | Score | Surface |
|---|---|---|---|---|---|---|
| Jun 25 | Wimbledon | Dustin Brown | W | 6-3, 6-1 | Grass | |
| Apr 10 | Fayez Sarofim & Co. U.S. Men's Clay Court Championship | Round 1 | Guido Pella | L | 3-6, 2-6 | Clay |
2017: 3-9
| Date | Tournament | Round | Opponent | Result | Score | Surface |
|---|---|---|---|---|---|---|
| Aug 14 | ATP & WTA Western & Southern Open | Round 1 | Sam Querrey | L | 3-6, 0-6 | Hard |
| Jul 31 | ATP & WTA Citi Open | Round 1 | Yuki Bhambri | L | 5-7, 0-2 ret. (ret.) | Hard |
| Jul 24 | ATP BB&T Atlanta Open | Round 1 | Quentin Halys | L | 5-7, 6-7(7) | Hard |
| Jul 17 | ATP Dell Technologies Hall of Fame | Round 1 | Adrian Menendez-Maceiras | L | 2-6, 6-7(5) | Grass |
| Jun 22 | ATP AEGON Championships | Round 2 | Marin Cilic | L | 0-6, 4-6 | Grass |
| Jun 20 | ATP AEGON Championships | Round 1 | Steve Johnson | W | 3-6, 6-1, 6-1 | Grass |
| Jun 15 | ATP & WTA Topshelf Open | Round 2 | Ivo Karlovic | L | 4-6, 1-6 | Grass |
| Jun 13 | ATP & WTA Topshelf Open | Dustin Brown | W | 6-3, 3-6, 6-3 | Grass | |
| Jun 13 | ATP & WTA Topshelf Open | Round 1 | Dustin Brown | W | 6-3, 3-6, 6-3 | Grass |
| Mar 10 | ATP & WTA BNP Paribas Open | Round 1 | Donald Young | L | 5-7, 6-7(5) | Hard |
| Feb 27 | ATP & WTA Abierto Mexicano Telcel | Round 1 | Ernesto Escobedo | L | 1-6, 6-2, 0-6 | Hard |
| Feb 21 | ATP Delray Beach Open | Round 1 | Steve Johnson | L | 1-6, 4-6 | Hard |
2016: 3-2
| Date | Tournament | Round | Opponent | Result | Score | Surface |
|---|---|---|---|---|---|---|
| Jul 13 | Infosys Hall of Fame Open | Round 2 | Donald Young | L | 0-6, 4-6 | Grass |
| Jul 12 | Infosys Hall of Fame Open | Round 1 | Benjamin Becker | W | 6-1, 6-2 | Grass |
| Jun 10 | ATP & WTA Ricoh Open | Quarterfinal | Sam Querrey | L | 3-6, 0-6 | Grass |
| Jun 8 | ATP & WTA Ricoh Open | Round 2 | Steve Johnson | W | 6-3, 6-4 | Grass |
| Jun 6 | ATP & WTA Ricoh Open | Round 1 | Yoshihito Nishioka | W | 6-1, 2-6, 6-3 | Grass |
2015: 0-2
| Date | Tournament | Round | Opponent | Result | Score | Surface |
|---|---|---|---|---|---|---|
| Feb 17 | Delray Beach Open | Round 1 | Tim Smyczek | L | 5-7, 2-6 | Hard |
| Feb 9 | ATP Memphis Open | Round 1 | Jared Donaldson | L | 5-7, 0-6 | Hard |
2014: 0-1
| Date | Tournament | Round | Opponent | Result | Score | Surface |
|---|---|---|---|---|---|---|
| Oct 20 | ATP Valencia Open 500 | Round 1 | Martin Klizan | L | 3-6, 3-6 | Hard |
2013: 0-1
| Date | Tournament | Round | Opponent | Result | Score | Surface |
|---|---|---|---|---|---|---|
| Jul 8 | ATP Hall of Fame | Round 1 | Michal Przysiezny | L | 3-6, 7-6(9), 4-6 | Grass |
How he is doing now
2026 record0-0
2026 titles0none yet this season
Last 101-9LLLWLLLLLLNewest first. Three losses in a row.
- Jul 25vs Zachary SvajdaJul 25 - Mubadala DC Open, Qualifying 1st RoundL5-7, 1-6
- Feb 21vs Patrick KypsonFeb 21 - Abierto Mexicano Telcel presentado por HSBC, Qualifying 1st RoundL6-7(3), 0-6
- Feb 23vs Nishesh BasavareddyFeb 23 - Abierto Mexicano Telcel presentado por HSBC, Qualifying FinalL2-6, 4-6
- Feb 22vs Duarte ValeFeb 22 - Abierto Mexicano Telcel presentado por HSBC, Qualifying 1st RoundW6-1, 6-4
- Feb 8vs Zachary SvajdaFeb 8 - Delray Beach Open, Qualifying 1st RoundL3-6, 0-6
- Mar 30vs Denis YevseyevMar 30 - Fayez Sarofim & Co. U.S. Men's Clay Court Championship, Qualifying 1st RoundL2-6, 0-6
Career
13years2013 to 2022
- 2013First ATP matchLost to Michal Przysiezny, ATP Hall of Fame
- 2022Career high No. 103Jul 18, 2022
- Sep 19, 2022Latest matchLost to J.J. Wolf, Cymbiotika San Diego Open
Grand Slam titles
AO0Round 2 (2022)1-1 in our records
RG0-
WIM0Round 1 (2022)1-1 in our records
USO0Round 1 (2022)0-2 in our records
First ATP match
Jul 8, 2013: lost to Michal Przysiezny 3-6, 7-6, 4-6ATP Hall of Fame, on grass
Latest match
Sep 19, 2022: lost to J.J. Wolf 2-6, 6-7Cymbiotika San Diego Open, Round 1, on hard court
Most often against
The players he has met most in our records, with the head-to-head.
Dustin Brown3 meetings, finals 0-0
3-0Kozlov leads
Last: Jun 25, 2018, Wimbledon, won
Zachary Svajda3 meetings, finals 0-0
0-3Kozlov trails
Last: Jul 25, 2026, Mubadala DC Open Qualifying 1st Round, lost
Bjorn Fratangelo2 meetings, finals 0-0
1-1All square
Last: Feb 13, 2022, Delray Beach Open Qualifying Final, lost
Donald Young2 meetings, finals 0-0
0-2Kozlov trails
Last: Mar 10, 2017, ATP & WTA BNP Paribas Open Round 1, lost
Sam Querrey2 meetings, finals 0-0
0-2Kozlov trails
Last: Aug 14, 2017, ATP & WTA Western & Southern Open Round 1, lost
Sources and updates
Results and schedules come from Agatha's own records of the ATP Tour.
Updated Oct 5, 2026, 3:18 PM ET. Results and form refresh after every match; biography facts are checked weekly.