Player

🇺🇸 Stefan Kozlov

Career matches 610

Wins 340

Losses 270

Win rate 55.7%

Elo (current) 2,170 2026-04-22

Surface breakdown

Hard 56.9% 252W – 191L (443 matches)

Clay 56.8% 75W – 57L (132 matches)

Grass 37.1% 13W – 22L (35 matches)

Career form (last 10)

WLLWWWLLLW

Newest on left. Hover for details.

Head-to-head (top 5 opponents)

Opponent	Played	W	L	W%
J.J. Wolf	10	5	5	50%
Mitchell Krueger	10	5	5	50%
Tennys Sandgren	9	6	3	67%
Steve Johnson	8	5	3	63%
Darian King	7	1	6	14%

Recent matches

501–550 of 610

Date	Tournament	Round	Winner	Loser	Score	Surface
2016-02-01	Dallas CH	Q1	Ryan Haviland	Stefan Kozlov	6-4 1-6 6-2	Hard
2016-01-25	Lahaina CH	R32	Nicolas Meister	Stefan Kozlov	6-3 6-1	Hard
2016-01-11	USA F2	R32	Michael Mmoh	Stefan Kozlov	7-5 6-4	Hard
2016-01-04	USA F1	F	Stefan Kozlov	Philip Bester	7-6(7) 6-7(3) 6-3	Hard
2016-01-04	USA F1	SF	Stefan Kozlov	Tennys Sandgren	6-1 6-1	Hard
2016-01-04	USA F1	QF	Stefan Kozlov	Gianluigi Quinzi	6-3 3-6 6-1	Hard
2016-01-04	USA F1	R16	Stefan Kozlov	Max De Vroome	6-3 6-3	Hard
2016-01-04	USA F1	R32	Stefan Kozlov	Jean Yves Aubone	6-0 7-5	Hard
2015-11-23	USA F34	R16	Cameron Norrie	Stefan Kozlov	6-3 4-6 6-3	Hard
2015-11-23	USA F34	R32	Stefan Kozlov	Damon Gooch	6-0 6-3	Hard
2015-11-10	Knoxville CH	R16	Dennis Novikov	Stefan Kozlov	6-3 7-6(4)	Hard
2015-11-10	Knoxville CH	R32	Stefan Kozlov	Malek Jaziri	6-1 6-2	Hard
2015-11-02	Charlottesville CH	QF	Noah Rubin	Stefan Kozlov	6-4 6-4	Hard
2015-11-02	Charlottesville CH	R16	Stefan Kozlov	David Rice	2-6 6-4 6-2	Hard
2015-11-02	Charlottesville CH	R32	Stefan Kozlov	Collin Altamirano	6-3 6-0	Hard
2015-10-19	Belarus F4	F	Stefan Kozlov	Dzmitry Zhyrmont	6-1 7-6(1)	Hard
2015-10-19	Belarus F4	SF	Stefan Kozlov	Adrian Sikora	7-6(3) 6-3	Hard
2015-10-19	Belarus F4	QF	Stefan Kozlov	Vladimir Korolev	6-2 4-6 6-4	Hard
2015-10-19	Belarus F4	R16	Stefan Kozlov	Pavel Kotov	6-1 3-6 6-2	Hard
2015-10-19	Belarus F4	R32	Stefan Kozlov	Alexander Zgirovsky	6-0 6-3	Hard
2015-10-12	Belarus F3	F	Dzmitry Zhyrmont	Stefan Kozlov	6-1 6-4	Hard
2015-10-12	Belarus F3	SF	Stefan Kozlov	Baris Erguden	6-2 6-0	Hard
2015-10-12	Belarus F3	QF	Stefan Kozlov	Pavel Kotov	6-3 6-4	Hard
2015-10-12	Belarus F3	R16	Stefan Kozlov	Ivan Davydov	5-7 6-2 6-2	Hard
2015-10-12	Belarus F3	R32	Stefan Kozlov	Kirill Komarov	6-2 6-4	Hard
2015-10-05	France F21	R32	Ronan Joncour	Stefan Kozlov	6-3 1-6 6-3	Hard
2015-09-28	Croatia F18	SF	Vaclav Safranek	Stefan Kozlov	5-7 6-3 6-0	Clay
2015-09-28	Croatia F18	QF	Stefan Kozlov	Mate Delic	6-4 1-6 7-6(5)	Clay
2015-09-28	Croatia F18	R16	Stefan Kozlov	Leon Schutt	6-7(3) 6-2 7-5	Clay
2015-09-28	Croatia F18	R32	Stefan Kozlov	David Szintai	6-2 6-2	Clay
2015-09-21	Columbus CH	R32	Dennis Novikov	Stefan Kozlov	7-6(2) 7-6(3)	Hard
2015-09-14	Cary CH	R32	Austin Krajicek	Stefan Kozlov	7-5 2-6 6-2	Hard
2015-08-31	US Open	Q1	Guido Andreozzi	Stefan Kozlov	6-2 5-7 6-3	Hard
2015-08-16	Cincinnati Masters	Q1	Yen Hsun Lu	Stefan Kozlov	6-4 6-3	Hard
2015-07-06	Winnetka CH	R32	Ryan Harrison	Stefan Kozlov	6-4 6-4	Hard
2015-05-18	Mexico F4	SF	Darian King	Stefan Kozlov	6-4 3-6 6-4	Hard
2015-05-18	Mexico F4	QF	Stefan Kozlov	Jarryd Chaplin	6-4 6-4	Hard
2015-05-18	Mexico F4	R16	Stefan Kozlov	Hans Hach Verdugo	6-3 3-6 6-3	Hard
2015-05-18	Mexico F4	R32	Stefan Kozlov	Ivar Jose Aramburu Contreras	6-4 6-1	Hard
2015-05-11	Mexico F3	F	Ivan Endara	Stefan Kozlov	6-1 7-6(3)	Hard
2015-05-11	Mexico F3	SF	Stefan Kozlov	Luis David Martinez	6-3 6-4	Hard
2015-05-11	Mexico F3	QF	Stefan Kozlov	Carlos Ramirez Utermann	6-4 6-2	Hard
2015-05-11	Mexico F3	R16	Stefan Kozlov	Jarryd Chaplin	6-4 6-3	Hard
2015-05-11	Mexico F3	R32	Stefan Kozlov	Nikita Kryvonos	1-6 7-5 6-4	Hard
2015-05-04	USA F15	F	Darian King	Stefan Kozlov	6-2 3-6 6-0	Clay
2015-05-04	USA F15	SF	Stefan Kozlov	Sekou Bangoura	6-2 2-6 6-4	Clay
2015-05-04	USA F15	QF	Stefan Kozlov	Wil Spencer	6-7(2) 6-2 6-4	Clay
2015-05-04	USA F15	R16	Stefan Kozlov	Ryan Haviland	6-4 6-4	Clay
2015-05-04	USA F15	R32	Stefan Kozlov	Greg Ouellette	6-3 6-7(6) 7-5	Clay
2015-04-27	Tallahassee CH	R32	Facundo Arguello	Stefan Kozlov	6-4 7-5	Clay

Aliases

atp

S. Kozlov
Stefan Kozlov (ke64)

atp_short

S. Kozlov (ke64)

itf

Stefan Kozlov (800335858)

sackmann

Stefan Kozlov (111578)

variant

S Kozlov