Stefan Kozlov
| Challenger - Orlando | 01/02 20:20 | 25 | [316] Stefan Kozlov v Mitchell Krueger [228] | 6-2,5-7,6-3 | |
| Challenger - Orlando | 12/31 19:00 | - | [312] Alejandro Gonzalez v Stefan Kozlov [316] | Cancelled | |
| Challenger - Houston | 11/13 17:35 | 25 | [115] Paolo Lorenzi v Stefan Kozlov [414] | 6-4,3-6,6-4 | |
| Challenger - Knoxville | 11/04 16:55 | 45 | [391] Evan Song v Stefan Kozlov [352] | 6-4,3-6,6-3 | |
| Challenger - Charlottesville | 10/28 16:00 | 46 | [470] Petros Chrysochos v Stefan Kozlov [348] | 1-6,6-3,6-2 | |
| Challenger - Charlottesville | 10/27 16:10 | 45 | Emil Reinberg v Stefan Kozlov | 6-3,6-7,1-6 | |
| Challenger - Las Vegas | 10/23 18:00 | 25 | [194] Kamil Majchrzak v Stefan Kozlov [348] | 6-0,6-2 | |
| Challenger - Calgary | 10/15 20:30 | 25 | [262] Stefan Kozlov v Jan Choinski [267] | 3-6,3-6 | |
| Challenger - Monterrey | 10/01 21:25 | 25 | Stefan Kozlov v Lucas Gomez | 2-6,4-6 | |
| Challenger Aptos | 08/06 18:00 | 25 | [252] Stefan Kozlov v Kaichi Uchida [296] | 4-6,1-6 | |
| ATP Washington Qual | 07/28 14:00 | 45 | [427] Jared Hiltzik v Stefan Kozlov [243] | 6-3,6-3 | |
| Wimbledon Qual | 06/26 14:50 | 45 | [246] Stefan Kozlov v Yannick Maden [134] | 1-6,3-6 | |
| Wimbledon Qual | 06/25 14:05 | 44 | [175] Dustin Brown v Stefan Kozlov [199] | 3-6,1-6 | |
| Challenger Ilkley Qual | 06/17 11:35 | 45 | [468] Brydan Klein v Stefan Kozlov [182] | 4-6,6-1,7-5 | |
| Challenger - Nottingham | 06/12 10:00 | 25 | [182] Stefan Kozlov v Christopher Eubanks [190] | 3-6,3-6 | |
| Challenger - Nottingham | 06/12 10:00 | - | Stefan Kozlov v James Duckworth | Cancelled | |
| Challenger Surbiton Qual | 06/02 13:55 | 45 | Stefan Kozlov v Daniel Evans | 1-6,0-6 | |
| Challenger Vicenza Qual | 05/27 10:50 | 46 | [175] Stefan Kozlov v Martin Cuevas [296] | 4-6,1-6 | |
| Challenger Vicenza Qual | 05/26 11:50 | 45 | Stefan Kozlov v Edoardo Sardella | 6-1,6-2 | |
| French Open Qual | 05/22 08:00 | 44 | [175] Stefan Kozlov v Yasutaka Uchiyama [234] | 4-6,5-7 | |
| Challenger - Bordeaux | 05/18 09:30 | 27 | [206] Reilly Opelka v Stefan Kozlov [189] | 7-6,6-1 | |
| Challenger - Bordeaux | 05/16 09:55 | 26 | [233] Antoine Hoang v Stefan Kozlov [189] | 3-6,6-7 | |
| Challenger - Bordeaux | 05/15 13:05 | 25 | [189] Stefan Kozlov v Pierre-Hugues Herbert [90] | 6-2,7-6 | |
| Challenger - Aix en Provence | 05/08 15:05 | 25 | Stefan Kozlov v Constant Lestienne | 6-7,4-6 | |
| Challenger - Sarasota | 04/20 20:30 | 27 | [231] Hugo Dellien v Stefan Kozlov [170] | 5-7,6-1,7-6 | |
| Challenger - Sarasota | 04/18 20:30 | 26 | [170] Stefan Kozlov v Donald Young [131] | 6-4,6-4 | |
| Challenger - Sarasota | 04/16 18:00 | 25 | [219] Mitchell Krueger v Stefan Kozlov [170] | 4-6,3-6 | |
| ATP - Houston | 04/10 21:35 | 25 | [184] Stefan Kozlov v Guido Pella [63] | 3-6,2-6 | |
| ATP Houston Qual | 04/08 18:20 | - | [182] Stefan Kozlov v Akira Santillan [170] | 6-2,6-0 | |
| ATP Houston Qual | 04/07 21:25 | 26 | [145] Thomaz Bellucci v Stefan Kozlov [182] | 7-6,3-6,6-7 |
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.