Stefan Kozlov
| Challenger - Knoxville | 11/10 00:20 | 25 | [172] Aleksandar Vukic v Stefan Kozlov [188] | 3-6,6-4,5-7 | |
| Challenger - Charlottesville | 11/07 18:00 | 29 | [224] Stefan Kozlov v Aleksandar Vukic [190] | 6-2,6-3 | |
| Challenger - Charlottesville | 11/06 17:35 | 28 | [224] Stefan Kozlov v Jeffrey John Wolf [159] | 6-1,6-7,6-0 | |
| Challenger - Charlottesville | 11/05 17:55 | 27 | [349] Emilio Nava v Stefan Kozlov [224] | 4-6,2-6 | |
| Challenger - Charlottesville | 11/03 23:55 | 26 | [213] Jason Kubler v Stefan Kozlov [224] | 3-6,1-6 | |
| Challenger - Charlottesville | 11/03 01:35 | 25 | [224] Stefan Kozlov v Bjorn Fratangelo [172] | 7-5,6-2 | |
| Challenger - Las Vegas | 10/31 19:00 | 29 | [247] Stefan Kozlov v Jeffrey John Wolf [195] | 4-6,4-6 | |
| Challenger - Las Vegas | 10/30 21:50 | 28 | [247] Stefan Kozlov v Aleksandar Kovacevic [352] | 6-2,6-4 | |
| Challenger - Las Vegas | 10/29 19:35 | 27 | [247] Stefan Kozlov v Emilio Gomez [149] | 7-6,6-4 | |
| Challenger - Las Vegas | 10/28 19:35 | 26 | [374] Aidan Mchugh v Stefan Kozlov [247] | 2-6,7-5,6-7 | |
| Challenger - Las Vegas | 10/26 20:20 | 25 | [392] Sasikumar Mukund v Stefan Kozlov [247] | 2-6,4-6 | |
| ATP - Indian Wells | 10/06 18:00 | 19 | [253] Stefan Kozlov v Christopher Eubanks [194] | 6-2,0-6,5-7 | |
| ATP - Indian Wells | 10/05 19:25 | 14 | [165] Jason Jung v Stefan Kozlov [253] | Retired | |
| Challenger Columbus | 09/26 16:55 | 29 | [301] Stefan Kozlov v Max Purcell [189] | 4-6,6-2,6-4 | |
| Challenger Columbus | 09/25 16:00 | 28 | [196] Jeffrey John Wolf v Stefan Kozlov [301] | 6-2,3-6,5-7 | |
| Challenger Columbus | 09/24 15:00 | 27 | [226] Mikael Torpegaard v Stefan Kozlov [301] | 6-2,6-7,4-6 | |
| Challenger Columbus | 09/23 15:00 | 26 | [219] Jason Kubler v Stefan Kozlov [301] | 2-6,5-7 | |
| Challenger Columbus | 09/21 19:45 | 25 | [301] Stefan Kozlov v Mitchell Krueger [156] | 6-0,6-3 | |
| Challenger Cary | 09/14 15:00 | 25 | [301] Stefan Kozlov v Zachary Svajda [476] | Retired | |
| Challenger - Kiev | 09/06 12:00 | 25 | [291] Franco Agamenone v Stefan Kozlov [312] | 6-4,7-5 | |
| Challenger - Maiorca | 09/02 16:25 | 26 | [312] Stefan Kozlov v Fernando Verdasco [132] | 6-1,6-7,2-6 | |
| Challenger - Maiorca | 08/31 12:55 | 25 | Daniel Rincon v Stefan Kozlov | 3-6,6-1,1-6 | |
| Open dos EUA | 08/24 15:00 | 14 | [117] Bernabe Zapata Miralles v Stefan Kozlov [309] | 7-5,1-6,6-3 | |
| Challenger - Lexington | 07/29 20:00 | 26 | [322] Stefan Kozlov v Alejandro Tabilo [174] | 2-6,2-6 | |
| Challenger - Lexington | 07/27 22:30 | 25 | [217] Christopher Eubanks v Stefan Kozlov [322] | 6-7,6-7 | |
| Challenger - Lexington | 07/26 20:55 | 19 | [322] Stefan Kozlov v Edan Leshem [418] | 3-6,7-6,6-1 | |
| Challenger - Lexington | 07/25 20:30 | 14 | Stefan Kozlov v Sam Riffice | 6-2,6-3 | |
| Challenger Cary | 07/24 21:25 | 28 | [344] Stefan Kozlov v Ramkumar Ramanathan [227] | 6-1,3-6,1-6 | |
| Challenger Cary | 07/23 23:00 | 27 | [220] Christopher Eubanks v Stefan Kozlov [344] | 7-5,1-6,3-6 | |
| Challenger Cary | 07/21 18:45 | 26 | [344] Stefan Kozlov v Maxime Cressy [149] | 3-6,6-3,6-4 |
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.