| Challenger Chicago | 08/04 18:05 | 19 |
[431] Stefan Kozlov v
Tsung-Hao Huang
[213] |
6-1,5-7,2-6 | |
| Challenger Chicago | 08/03 20:20 | 45 |
[431] Stefan Kozlov v
Ramkumar Ramanathan
[127] 
|
Retired | |
| Challenger Newport | 07/07 20:40 | 25 |
[164] Mitchell Krueger
v
Stefan Kozlov [367]
|
6-1,3-6,6-1 | |
| Challenger Tyler | 06/02 18:00 | 19 |
[375] Stefan Kozlov v
Alvin N Tudorica
[451] |
5-7,3-6 | |
| Challenger Tyler | 06/01 22:45 | 14 |
Stefan Kozlov v
Daniel Milavsky
|
6-3,6-7,6-3 | |
| Challenger Little Rock | 05/29 16:00 | 26 |
[306] Andres Andrade
v
Stefan Kozlov [375]
|
6-1,4-6,7-5 | |
| Challenger Little Rock | 05/28 20:10 | 25 |
[375] Stefan Kozlov v
Aziz Dougaz
[222] 
|
5-7,6-3,6-2 | |
| Challenger Little Rock | 05/28 15:00 | 19 |
Stefan Kozlov v
Elmar Ejupovic
|
6-4,7-6 | |
| Challenger Little Rock | 05/27 21:00 | 14 |
Stefan Kozlov v
Kiranpal Pannu
|
7-6,2-6,6-2 | |
| ITF M25 Xalapa | 05/18 20:00 | - |
[196] Yuichiro Inui
v
Stefan Kozlov [441]
|
7-6,4-6,4-6 | |
| ITF M25 Xalapa | 05/17 23:30 | - |
Stefan Kozlov v
Maxwell McKennon
|
2-6,6-1,6-4 | |
| ITF M25 Xalapa | 05/16 23:30 | - |
[441] Stefan Kozlov v
Aidan Mayo
[312] 
|
6-4,6-4 | |
| ITF M25 Xalapa | 05/15 20:00 | - |
Stefan Kozlov v
Axel Nefve
|
6-4,6-4 | |
| ITF M25 Xalapa | 05/15 01:00 | - |
Stefan Kozlov v
Marat Sanchez Ballinas
|
6-1,6-1 | |
| Challenger Savannah | 04/25 21:30 | 27 |
[125] Eliot Spizzirri
v
Stefan Kozlov [488]
|
6-3,7-5 | |
| Challenger Savannah | 04/24 17:50 | 26 |
[488] Stefan Kozlov v
Geoffrey Blancaneaux
[276] 
|
Retired | |
| Challenger Savannah | 04/22 20:00 | 25 |
[377] Max Wiskandt
v
Stefan Kozlov [488]
|
2-6,1-6 | |
| Challenger Savannah | 04/21 14:00 | 19 |
Christian Sigsgaard
v
Stefan Kozlov
|
4-6,4-6 | |
| Challenger Savannah | 04/20 15:30 | 14 |
Ryan Fishback
v
Stefan Kozlov
|
5-7,3-6 | |
| Challenger Morelos | 04/02 18:55 | 26 |
Stefan Kozlov v
Rafael Jodar
|
5-7,6-3,2-6 | |
| Challenger Morelos | 04/01 01:15 | 25 |
[111] Thiago Agustin Tirante
v
Stefan Kozlov [404]
|
6-4,4-6,2-6 | |
| ATP Acapulco | 02/24 00:00 | 19 |
[360] Stefan Kozlov v
Nishesh Basavareddy
[106] |
2-6,4-6 | |
| ATP Acapulco | 02/23 00:25 | 14 |
[476] Duarte Vale
v
Stefan Kozlov [360]
|
1-6,4-6 | |
| ATP Acapulco | 02/23 00:10 | 14 |
Rinky Hijikata
v
Stefan Kozlov
|
Cancelled | |
| ATP Delray Beach | 02/08 21:05 | 14 |
[353] Stefan Kozlov v
Zachary Svajda
[168] 
|
3-6,0-6 | |
| Challenger Cleveland | 01/31 23:25 | 27 |
[258] J.J. Wolf
v
Stefan Kozlov [354]
|
6-1,6-3 | |
| Challenger Cleveland | 01/30 17:40 | 26 |
Stefan Kozlov v
Kaylan Bigun
|
6-2,6-3 | |
| Challenger Cleveland | 01/28 21:15 | 25 |
[439] Micah Braswell
v
Stefan Kozlov [354]
|
6-4,3-6,4-6 | |
| Challenger Quimper | 01/22 11:00 | 25 |
[160] Elmer Moller
v
Stefan Kozlov [355]
|
6-3,7-5 | |
| Challenger Quimper | 01/21 10:35 | 19 |
[490] Loann Massard
v
Stefan Kozlov [355]
|
6-4,2-6,4-6 |
Wikipedia - Stefan Kozlov
Stefan Kozlov (Russian: Стефан Козлов, STEF-ahn KOZ-lov; born February 1, 1998) is an American professional tennis player of Russian descent. He has a career-high ATP ranking of world No. 103 achieved on 18 July 2022 and doubles ranking of world No. 180 on 19 June 2017.
Kozlov made his ATP World Tour debut as a wildcard in 2013 Hall of Fame Tennis Championships at the age of 15. He reached two junior Grand Slam finals in 2014 and finished the year at World No. 3 in the ITF Junior Combined rankings.