| ITF M15 Weston | 07/05 15:00 | 29 | Liam Draxl v Stefan Kozlov | Postponed | |
| ITF M15 Weston | 07/04 15:00 | 28 | [232] Ryan Harrison v Stefan Kozlov [347] | 7-5,3-6,3-6 | |
| ITF M15 Weston | 07/03 17:15 | 27 | Stefan Kozlov v Christian Langmo | 6-2,7-5 | |
| ITF M15 Weston | 07/02 21:20 | 26 | Stefan Kozlov v Ben Shelton | 7-5,6-1 | |
| ITF M15 Weston | 07/02 21:00 | - | Stefan Kozlov v Ben Shelton | 7-5,6-1 | |
| ITF M15 Weston | 07/01 13:00 | 25 | [347] Stefan Kozlov v Evan Zhu [477] | 6-3,3-6,6-1 | |
| ITF M25 Tulsa | 06/16 23:30 | 25 | [492] Michail Pervolarakis v Stefan Kozlov [349] | 7-6,6-4 | |
| Challenger Orlando | 06/08 19:15 | 25 | [340] Thiago Agustin Tirante v Stefan Kozlov [366] | 6-3,6-1 | |
| Challenger Orlando | 06/07 14:00 | 19 | [342] Adrian Andreev v Stefan Kozlov [366] | 6-4,4-6,4-6 | |
| Challenger Orlando | 06/06 16:50 | 14 | [123] Robert Galloway v Stefan Kozlov [366] | 4-6,6-7 | |
| Challenger Little Rock | 06/02 20:40 | 25 | [366] Stefan Kozlov v Thai-Son Kwiatkowski [219] | 2-6,1-6 | |
| Challenger Little Rock | 05/31 15:00 | 19 | Stefan Kozlov v Strong Kirchheimer | 6-3,6-2 | |
| Challenger Little Rock | 05/30 18:40 | 14 | Stefan Kozlov v Brian Battistone | 6-2,6-2 | |
| ATP Acapulco | 03/17 03:10 | 25 | [61] Cameron Norrie v Stefan Kozlov [389] | 6-3,6-3 | |
| ATP Acapulco | 03/16 01:35 | 19 | [389] Stefan Kozlov v Botic Van De Zandschulp [149] | Retired | |
| ATP Acapulco | 03/15 02:55 | 15 | [100] Joao Sousa v Stefan Kozlov [387] | 2-6,6-2,3-6 | |
| ATP Acapulco | 03/14 02:55 | 14 | Jordi Arconada v Stefan Kozlov | 4-6,1-6 | |
| ITF M25 Naples | 02/18 16:55 | 26 | [195] Mitchell Krueger v Stefan Kozlov [376] | Retired | |
| ITF M25 Naples | 02/17 20:50 | 25 | [414] Gonzalo Villanueva v Stefan Kozlov [376] | 3-6,2-6 | |
| UTR Pro Tennis Series Florida | 01/16 17:15 | - | Stefan Kozlov v Harris Walker | 0-6,2-6 | |
| UTR Pro Tennis Series Florida | 01/14 18:00 | - | [374] Stefan Kozlov v Strong Kirchheimer [486] | 6-2,7-6 | |
| UTR Pro Tennis Series Florida | 01/13 16:00 | - | Stefan Kozlov v Connor Krug | 6-1,6-2 | |
| UTR Pro Tennis Series Florida | 01/11 18:30 | - | Stefan Kozlov v Aidan Kim | 6-4,6-6 | |
| UTR Pro Tennis Series Florida | 01/10 15:30 | - | Stefan Kozlov v Nishesh Basavareddy | 3-6,6-2,6-2 | |
| ATP Delray Beach | 01/06 16:00 | 19 | [327] Donald Young v Stefan Kozlov [374] | 4-6,6-4,6-4 | |
| ATP Delray Beach | 01/05 15:00 | 164 | [374] Stefan Kozlov v Johannes Haerteis [305] | Retired | |
| Challenger Orlando | 11/17 18:30 | 25 | [84] Thiago Monteiro v Stefan Kozlov [375] | 6-1,6-3 | |
| Challenger Orlando | 11/15 17:30 | 19 | [298] Kevin King v Stefan Kozlov [374] | 6-7,7-6,4-6 | |
| Challenger Orlando | 11/14 17:45 | 64 | [395] Martin Damm v Stefan Kozlov [374] | 4-6,7-6,4-6 | |
| Challenger Cary | 11/07 17:00 | 64 | [450] Nicolas Mejia v Stefan Kozlov [373] | 2-6,7-5,7-6 |
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.