Stefan Kozlov
| Challenger - Bordeaux | 05/10 15:00 | 25 | [94] Jaume Munar v Stefan Kozlov [118] | 6-2,6-3 | |
| Challenger - Savannah | 04/26 21:30 | 25 | Jose Pereira v Stefan Kozlov | 6-1,6-0 | |
| Challenger - Ciudad de Mexico | 04/04 21:55 | 25 | [271] Gerald Melzer v Stefan Kozlov [122] | Retired | |
| Challenger - Pereira | 03/29 16:55 | 25 | [264] Nicolas Mejia v Stefan Kozlov [120] | 6-1,6-1 | |
| ATP - Miami | 03/21 15:25 | 14 | [164] Mitchell Krueger v Stefan Kozlov [121] | 6-2,6-2 | |
| ATP - Indian Wells | 03/10 00:00 | 19 | [86] Holger N Rune v Stefan Kozlov [121] | 6-4,6-2 | |
| ATP - Indian Wells | 03/09 02:35 | 14 | Sebastian Sec v Stefan Kozlov | 3-6,7-6,2-6 | |
| ATP - Acapulco | 02/24 02:00 | 26 | [5] Rafael Nadal v Stefan Kozlov [130] | 6-0,6-3 | |
| ATP - Acapulco | 02/22 03:35 | 25 | [33] Grigor Dimitrov v Stefan Kozlov [130] | 6-7,7-5,3-6 | |
| ATP - Acapulco | 02/21 02:55 | 19 | [85] Oscar Otte v Stefan Kozlov [151] | 6-1,0-6,7-6 | |
| ATP - Acapulco | 02/20 04:10 | 14 | Stefan Kozlov v Steve Johnson | 6-4,6-3 | |
| ATP - Delray Beach | 02/18 18:00 | 27 | [41] Tommy Paul v Stefan Kozlov [151] | 6-3,6-1 | |
| ATP - Delray Beach | 02/16 18:05 | 26 | [99] Steve Johnson v Stefan Kozlov [151] | 1-6,3-6 | |
| ATP - Delray Beach | 02/15 19:30 | 25 | [151] Stefan Kozlov v Emilio Gomez [149] | 4-6,7-5,6-3 | |
| ATP - Delray Beach | 02/15 19:30 | 25 | Stefan Kozlov v Jenson Brooksby | Cancelled | |
| ATP - Delray Beach | 02/13 18:00 | 19 | [152] Stefan Kozlov v Bjorn Fratangelo [154] | Retired | |
| ATP - Delray Beach | 02/12 17:00 | 14 | [152] Stefan Kozlov v Go Soeda [281] | 7-5,6-2 | |
| Challenger - Columbus | 01/26 15:00 | 26 | [169] Stefan Kozlov v Dominic Stephan Stricker [241] | 6-4,4-6,3-6 | |
| Challenger - Columbus | 01/24 23:20 | 25 | Alexander Bernard v Stefan Kozlov | 2-6,1-6 | |
| Australian Open | 01/19 03:45 | 24 | [169] Stefan Kozlov v Matteo Berrettini [7] | 1-6,6-4,4-6,1-6 | |
| Australian Open | 01/17 01:40 | 23 | [168] Stefan Kozlov v Jiri Vesely [79] | 7-5,6-3,6-4 | |
| ATP - Sydney | 01/09 04:15 | 14 | [159] Stefan Kozlov v Denis Kudla [105] | 6-4,6-7,3-6 | |
| Challenger - Bendigo | 01/04 01:50 | 25 | [205] Flavio Cobolli v Stefan Kozlov [159] | 6-4,3-6,6-1 | |
| Challenger - Champaign | 11/21 17:00 | 29 | [170] Aleksandar Vukic v Stefan Kozlov [187] | 7-5,3-6,4-6 | |
| Challenger - Champaign | 11/20 20:35 | 28 | [184] Jeffrey John Wolf v Stefan Kozlov [187] | 2-6,3-6 | |
| Challenger - Champaign | 11/19 20:50 | 27 | [187] Stefan Kozlov v Mitchell Krueger [164] | 6-4,6-4 | |
| Challenger - Champaign | 11/17 17:25 | 26 | Stefan Kozlov v Keegan Smith | 6-3,6-1 | |
| Challenger - Champaign | 11/15 22:30 | 25 | [187] Stefan Kozlov v JC Aragone [355] | 3-6,6-3,6-4 | |
| Challenger - Knoxville | 11/12 00:40 | 26 | [358] Aidan Mchugh v Stefan Kozlov [188] | 6-4,6-4 | |
| Challenger - Knoxville | 11/10 00:20 | 25 | [172] Aleksandar Vukic v Stefan Kozlov [188] | 3-6,6-4,5-7 |
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.