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
Challenger Quimper 01/20 13:20 14 [355] Stefan Kozlov v Filip Misolic [312] 6-3,6-4
UTR Pro Baton Rouge 01/12 17:00 29 Stefan Kozlov v Raphael Perot 6-2,6-1
UTR Pro Baton Rouge 01/11 19:15 28 Stefan Kozlov v William Nolan 6-3,6-3
UTR Pro Baton Rouge 01/09 17:00 - Stefan Kozlov v Andrej Loncarevic 6-3,6-3
UTR Pro Baton Rouge 01/08 20:35 - Stefan Kozlov v Evan Lee 6-3,6-1
UTR Pro Baton Rouge 01/07 19:05 - Stefan Kozlov v Bradley Paliska 6-1,6-1
UTR Pro Baton Rouge 01/06 17:00 - Stefan Kozlov v Parashar Bharadwaj 7-5,6-3
Challenger Champaign 11/12 21:05 25 [179] Patrick Kypson v Stefan Kozlov [346] 1-6,7-6,6-4
Challenger Sioux Falls 10/24 23:20 26 Murphy Cassone v Stefan Kozlov Walkover
Challenger Sioux Falls 10/22 00:20 25 [350] Stefan Kozlov v Dmitry Popko [175] 7-6,4-6,6-4
Challenger Lincoln 08/06 18:05 25 [360] Stefan Kozlov v Nishesh Basavareddy [295] 6-2,4-6,2-6
Challenger Lincoln 08/05 17:45 19 [360] Stefan Kozlov v Ernesto Escobedo [439] 6-3,6-1
Challenger Lincoln 08/04 18:50 14 Stefan Kozlov v Collin Altamirano 6-4,7-6
Challenger Lexington 07/30 17:40 25 [238] Bernard Tomic v Stefan Kozlov [367] 6-4,3-6,6-3
Challenger Lexington 07/29 20:40 19 Stefan Kozlov v Stefan Dostanic 7-6,0-6,7-5
Challenger Lexington 07/28 15:35 14 [365] Stefan Kozlov v Ryuki Matsuda [318] 6-2,6-3
Challenger Chicago 07/21 16:50 14 Stefan Kozlov v Aidan Mayo Cancelled
Challenger Granby 07/17 14:00 25 [381] Stefan Kozlov v Nicolas Mejia [256] 1-6,2-6
Challenger Granby 07/15 14:00 19 Cooper Williams v Stefan Kozlov 1-6,6-7
Challenger Granby 07/14 16:00 14 Victor Lilov v Stefan Kozlov 2-6,1-6
Challenger Bloomfield Hills 07/06 17:50 28 [442] Stefan Kozlov v Nishesh Basavareddy [366] Retired
Challenger Bloomfield Hills 07/05 20:45 27 [115] J.J. Wolf v Stefan Kozlov [442] 4-6,4-6
Challenger Bloomfield Hills 07/03 18:05 26 [442] Stefan Kozlov v Tung-Lin Wu [275] Retired
Challenger Bloomfield Hills 07/02 17:15 25 Stefan Kozlov v Michael Zheng 4-6,7-5,6-1

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.