Challenger - Las Vegas 10/17 18:00 26 Stefan Kozlov v Alexander Ritschard 5-7,6-4,6-1
Challenger - Las Vegas 10/15 20:55 25 Blaz Rola v Stefan Kozlov 4-6,3-6
Challenger - Las Vegas 10/14 23:15 24 Stefan Kozlov v Evan Song 6-4,6-3
Open dos EUA 08/20 16:15 44 Stefan Kozlov v Egor Gerasimov 4-6,4-6
Challenger - Binghamton 07/23 20:45 24 [274] Roberto Ortega-Olmedo v Stefan Kozlov [402] Retired
Challenger - Winnetka 07/11 19:15 26 [406] Stefan Kozlov v Jason Kubler [188] 2-6,3-6
Challenger - Winnetka 07/09 16:40 25 [146] Adrian Menendez-Maceiras v Stefan Kozlov [406] Retired
Challenger - Winnetka 07/08 19:55 24 [406] Stefan Kozlov v Evgeny Karlovskiy [216] 6-2,6-4
Challenger - Little Rock 06/05 18:00 25 [406] Stefan Kozlov v Zhe Li [239] 3-6,7-5,0-6
Challenger - Little Rock 06/04 17:10 24 Stefan Kozlov v Garrett Johns 7-5,6-3
Challenger - Savannah 04/29 19:30 24 [354] Aleksandar Vukic v Stefan Kozlov [366] 6-2,7-6
Challenger - Tallahassee 04/24 23:40 25 [374] Stefan Kozlov v Tennys Sandgren [103] 3-6,2-6
Challenger - Tallahassee 04/22 15:30 24 Stefan Kozlov v Alexander Zhurbin 4-6,6-4,6-0
ITF - M15 Sunrise 04/11 17:30 26 Stefan Kozlov v Dmitry Popko 5-7,3-6
ITF - M15 Sunrise 04/10 18:50 25 Stefan Kozlov v Mateus D C C Alves 6-3,6-1
ITF - M25 Calabasas 03/24 20:00 29 [492] Alexander Ritschard v Stefan Kozlov [339] 6-2,0-6,7-6
ITF - M25 Calabasas 03/23 20:40 28 Drew Baird v Stefan Kozlov 2-6,2-6
ITF - M25 Calabasas 03/22 20:00 27 Jonathan Gray v Stefan Kozlov 2-6,1-6
ITF - M25 Calabasas 03/21 23:25 26 Isaiah Strode v Stefan Kozlov 6-7,0-6
ITF - M25 Calabasas 03/19 20:30 25 [464] Ronnie Schneider v Stefan Kozlov [339] 2-6,0-6
Challenger - Drummondville 03/11 14:35 24 [435] Gijs Brouwer v Stefan Kozlov [340] 7-5,6-3
Challenger - Morelos 02/21 17:00 26 [338] Stefan Kozlov v Roberto Quiroz [182] 4-6,6-7
Challenger - Morelos 02/19 20:35 25 [310] Alexander Sarkissian v Stefan Kozlov [338] Retired
Challenger - Morelos 02/18 16:00 24 [319] Evan Song v Stefan Kozlov [338] 5-7,3-6
Challenger - Dallas 02/05 20:30 24 [489] Alex Rybakov v Stefan Kozlov [333] 6-2,6-1
Challenger - Cleveland 01/30 16:25 25 [164] Brayden Schnur v Stefan Kozlov [336] 7-6,6-4
Challenger - Cleveland 01/28 20:25 24 [466] Louis Wessels v Stefan Kozlov [336] 4-6,7-5,5-7
Challenger - Newport Beach 01/21 18:00 166 [311] Stefan Kozlov v Maxime Cressy [335] 5-7,1-6
Challenger Columbus 01/07 19:00 24 [366] Jeffrey John Wolf v Stefan Kozlov [309] 6-2,7-6
Challenger - Orlando 01/03 19:20 26 [264] Nino Serdarusic v Stefan Kozlov [316] 6-2,7-5

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.