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

551–600 of 610

Date	Tournament	Round	Winner	Loser	Score	Surface
2015-04-20	Savannah CH	R32	Tim Smyczek	Stefan Kozlov	6-4 6-1	Clay
2015-03-23	USA F11	R16	Clay Thompson	Stefan Kozlov	6-3 6-3	Hard
2015-03-23	USA F11	R32	Stefan Kozlov	Keanu Ellen	6-0 6-0	Hard
2015-03-16	USA F10	R16	Darian King	Stefan Kozlov	1-6 6-1 6-1	Hard
2015-03-16	USA F10	R32	Stefan Kozlov	Evan Song	6-3 6-4	Hard
2015-02-16	Delray Beach	R32	Tim Smyczek	Stefan Kozlov	7-5 6-2	Hard
2015-02-09	Memphis	R32	Jared Donaldson	Stefan Kozlov	7-5 6-0	Hard
2015-01-27	Maui CH	QF	James Mcgee	Stefan Kozlov	7-6(6) 6-2	Hard
2015-01-27	Maui CH	R16	Stefan Kozlov	Michael Russell	7-6(2) 6-3	Hard
2015-01-27	Maui CH	R32	Stefan Kozlov	Sekou Bangoura	6-4 6-2	Hard
2015-01-12	USA F4	QF	Frederik Nielsen	Stefan Kozlov	7-6(5) 4-6 6-0	Hard
2015-01-12	USA F4	R16	Stefan Kozlov	Dennis Novikov	6-0 6-1	Hard
2015-01-12	USA F4	R32	Stefan Kozlov	Karim Hossam	6-3 6-1	Hard
2015-01-05	USA F2	QF	Taylor Fritz	Stefan Kozlov	6-4 6-4	Hard
2015-01-05	USA F2	R16	Stefan Kozlov	Clay Thompson	6-2 2-6 6-3	Hard
2015-01-05	USA F2	R32	Stefan Kozlov	Joshua Milton	6-1 6-0	Hard
2014-10-27	Charlottesville CH	R32	Peter Torebko	Stefan Kozlov	6-3 7-6(2)	Hard
2014-10-20	Valencia	R32	Martin Klizan	Stefan Kozlov	6-3 6-3	Hard
2014-09-29	Sacramento CH	F	Sam Querrey	Stefan Kozlov	6-3 6-4	Hard
2014-09-29	Sacramento CH	SF	Stefan Kozlov	Tim Smyczek	3-6 6-3 7-6(1)	Hard
2014-09-29	Sacramento CH	QF	Stefan Kozlov	Rhyne Williams	4-6 7-6(3) 6-4	Hard
2014-09-29	Sacramento CH	R16	Stefan Kozlov	John Patrick Smith	6-4 3-6 6-4	Hard
2014-09-29	Sacramento CH	R32	Stefan Kozlov	Ryan Harrison	6-1 3-6 6-3	Hard
2014-09-22	USA F26	R16	Kyle Mcmorrow	Stefan Kozlov	6-1 6-4	Hard
2014-09-22	USA F26	R32	Stefan Kozlov	Patrick Davidson	6-3 6-2	Hard
2014-08-25	US Open	Q2	Borna Coric	Stefan Kozlov	2-6 6-2 6-2	Hard
2014-08-25	US Open	Q1	Stefan Kozlov	Mitchell Frank	3-6 6-0 6-2	Hard
2014-07-28	Washington	Q1	Sam Groth	Stefan Kozlov	3-6 7-6(5) 6-4	Hard
2014-05-19	Spain F10	R16	Juan Lizariturry	Stefan Kozlov	6-2 5-7 6-4	Clay
2014-05-19	Spain F10	R32	Stefan Kozlov	Sergio Martos Gornes	6-2 6-3	Clay
2014-04-28	USA F12	R16	Facundo Mena	Stefan Kozlov	3-6 6-3 6-2	Clay
2014-04-28	USA F12	R32	Stefan Kozlov	Devin Mccarthy	6-1 2-0 RET	Clay
2014-04-07	USA F11	SF	Filip Krajinovic	Stefan Kozlov	3-6 6-4 6-3	Hard
2014-04-07	USA F11	QF	Stefan Kozlov	Kyle Mcmorrow	6-2 2-6 6-1	Hard
2014-04-07	USA F11	R16	Stefan Kozlov	Nicolas Meister	7-6(6) 6-2	Hard
2014-04-07	USA F11	R32	Stefan Kozlov	Catalin Ionut Gard	6-3 6-4	Hard
2014-03-17	USA F9	R16	Kyle Mcmorrow	Stefan Kozlov	6-4 6-4	Hard
2014-03-17	USA F9	R32	Stefan Kozlov	Darian King	6-3 6-7(6) 1-0 RET	Hard
2014-03-10	USA F8	R32	Darian King	Stefan Kozlov	6-4 7-6(0)	Hard
2014-03-06	Indian Wells Masters	Q1	Sam Groth	Stefan Kozlov	6-3 6-4	Hard
2014-02-17	Delray Beach	Q1	Sekou Bangoura	Stefan Kozlov	6-2 4-6 6-3	Hard
2013-11-11	USA F31	QF	Greg Ouellette	Stefan Kozlov	6-4 7-6(4)	Clay
2013-11-11	USA F31	R16	Stefan Kozlov	Janis Podzus	6-4 6-4	Clay
2013-11-11	USA F31	R32	Stefan Kozlov	Oleg Dmitriev	6-4 7-5	Clay
2013-11-04	USA F30	QF	Gonzalo Escobar	Stefan Kozlov	7-6(8) 6-4	Clay
2013-11-04	USA F30	R16	Stefan Kozlov	Vadym Kalyuzhnyy	7-5 6-3	Clay
2013-11-04	USA F30	R32	Stefan Kozlov	Ruan Roelofse	6-3 6-4	Clay
2013-10-28	USA F29	R32	Martins Podzus	Stefan Kozlov	6-4 6-2	Clay
2013-10-14	USA F27	QF	Austin Krajicek	Stefan Kozlov	6-3 6-2	Hard
2013-10-14	USA F27	R16	Stefan Kozlov	Alexander Zverev	6-2 6-0	Hard

Aliases

atp

S. Kozlov
Stefan Kozlov (ke64)

atp_short

S. Kozlov (ke64)

itf

Stefan Kozlov (800335858)

sackmann

Stefan Kozlov (111578)

variant

S Kozlov