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

251–300 of 610

Date	Tournament	Round	Winner	Loser	Score	Surface
2021-02-15	M25 Naples FL	R16	Mitchell Krueger	Stefan Kozlov	6-4 3-0 RET	Clay
2021-02-15	M25 Naples FL	R32	Stefan Kozlov	Gonzalo Villanueva	6-3 6-2	Clay
2021-01-04	Delray Beach	Q2	Donald Young	Stefan Kozlov	4-6 6-4 6-4	Hard
2021-01-04	Delray Beach	Q1	Stefan Kozlov	Johannes Haerteis	5-0 RET	Hard
2020-11-16	Orlando CH	R32	Thiago Monteiro	Stefan Kozlov	6-1 6-3	Hard
2020-11-16	Orlando CH	Q2	Stefan Kozlov	Kevin King	7-6(1) 6-7(7) 6-4	Hard
2020-11-16	Orlando CH	Q1	Stefan Kozlov	Martin Damm	6-4 6-7(2) 6-4	Hard
2020-11-09	Cary CH	Q1	Nicolas Mejia	Stefan Kozlov	2-6 7-5 7-6(2)	Hard
2020-10-19	M25 Hamburg	QF	Raul Brancaccio	Stefan Kozlov	6-4 7-5	Hard
2020-10-19	M25 Hamburg	R16	Stefan Kozlov	Henri Squire	6-4 6-1	Hard
2020-10-19	M25 Hamburg	R32	Stefan Kozlov	Stefano Napolitano	6-4 6-2	Hard
2020-10-12	M25+H Rodez	R32	Jurgen Briand	Stefan Kozlov	6-4 6-2	Hard
2020-09-28	M25 Porto	SF	Nuno Borges	Stefan Kozlov	6-3 7-5	Hard
2020-09-28	M25 Porto	QF	Stefan Kozlov	Dayne Kelly	6-2 6-2	Hard
2020-09-28	M25 Porto	R16	Stefan Kozlov	Adrian Menendez Maceiras	7-5 6-3	Hard
2020-09-28	M25 Porto	R32	Stefan Kozlov	Michail Pervolarakis	6-1 6-4	Hard
2020-09-21	M15 Castelo Branco	R16	Nicolas Moreno De Alboran	Stefan Kozlov	6-3 6-4	Hard
2020-09-21	M15 Castelo Branco	R32	Stefan Kozlov	Alexis Musialek	7-5 6-0	Hard
2020-09-14	M25+H Plaisir	R32	Daniel Cukierman	Stefan Kozlov	1-6 6-3 6-1	Hard
2020-09-07	M15 Sintra	R32	Robert Strombachs	Stefan Kozlov	6-4 6-2	Hard
2020-02-17	Delray Beach	R32	Ugo Humbert	Stefan Kozlov	6-7(5) 6-3 6-1	Hard
2020-02-17	Delray Beach	Q2	Emilio Gomez	Stefan Kozlov	6-3 6-2	Hard
2020-02-17	Delray Beach	Q1	Stefan Kozlov	Alex Bolt	4-6 6-4 6-2	Hard
2020-02-03	Dallas CH	R64	Donald Young	Stefan Kozlov	6-2 6-2	Hard
2020-01-20	M15 Cancun	R32	Maximiliano Estevez	Stefan Kozlov	5-7 1-1 RET	Hard
2020-01-06	Ann Arbor CH	SF	Roberto Cid	Stefan Kozlov	7-6(1) 5-7 6-3	Hard
2020-01-06	Ann Arbor CH	QF	Stefan Kozlov	Bjorn Fratangelo	7-6(4) 6-2	Hard
2020-01-06	Ann Arbor CH	R16	Stefan Kozlov	Brandon Nakashima	4-6 6-3 6-2	Hard
2020-01-06	Ann Arbor CH	R32	Stefan Kozlov	Renzo Olivo	7-6(2) 6-2	Hard
2020-01-06	Ann Arbor CH	R64	Stefan Kozlov	Arthur Rinderknech	6-3 6-4	Hard
2019-11-11	Champaign-Urbana CH	QF	J.J. Wolf	Stefan Kozlov	6-2 6-2	Hard
2019-11-11	Champaign-Urbana CH	R16	Stefan Kozlov	Evan Song	6-4 4-6 6-1	Hard
2019-11-11	Champaign-Urbana CH	R32	Stefan Kozlov	Denis Kudla	6-3 6-3	Hard
2019-11-11	Champaign-Urbana CH	R64	Stefan Kozlov	Simon Carr	6-2 4-6 7-6(4)	Hard
2019-10-28	M25 Naples FL	QF	Cristian Rodriguez	Stefan Kozlov	6-2 6-2	Clay
2019-10-28	M25 Naples FL	R16	Stefan Kozlov	Sam Riffice	6-2 6-4	Clay
2019-10-28	M25 Naples FL	R32	Stefan Kozlov	Mwendwa Mbithi	6-4 6-3	Clay
2019-10-14	Las Vegas CH	QF	James Duckworth	Stefan Kozlov	6-2 6-3	Hard
2019-10-14	Las Vegas CH	R16	Stefan Kozlov	Alexander Ritschard	5-7 6-4 6-1	Hard
2019-10-14	Las Vegas CH	R32	Stefan Kozlov	Blaz Rola	6-4 6-3	Hard
2019-10-14	Las Vegas CH	R64	Stefan Kozlov	Evan Song	6-4 6-3	Hard
2019-08-26	US Open	Q1	Egor Gerasimov	Stefan Kozlov	6-4 6-4	Hard
2019-07-22	Binghamton CH	R64	Roberto Ortega Olmedo	Stefan Kozlov	6-7(5) 3-0 RET	Hard
2019-07-08	Winnetka CH	R16	Jason Kubler	Stefan Kozlov	6-2 6-3	Hard
2019-07-08	Winnetka CH	R32	Stefan Kozlov	Adrian Menendez Maceiras	7-5 4-0 RET	Hard
2019-07-08	Winnetka CH	R64	Stefan Kozlov	Evgeny Karlovskiy	6-2 6-4	Hard
2019-06-03	Little Rock CH	R32	Zhe Li	Stefan Kozlov	6-3 5-7 6-0	Hard
2019-06-03	Little Rock CH	R64	Stefan Kozlov	Garrett Johns	7-5 6-3	Hard
2019-04-29	Savannah CH	R64	Aleksandar Vukic	Stefan Kozlov	6-2 7-6(11)	Clay
2019-04-22	Tallahassee CH	R32	Tennys Sandgren	Stefan Kozlov	6-3 6-2	Clay

Aliases

atp

S. Kozlov
Stefan Kozlov (ke64)

atp_short

S. Kozlov (ke64)

itf

Stefan Kozlov (800335858)

sackmann

Stefan Kozlov (111578)

variant

S Kozlov