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 - Mexico City | 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 | |
| Austraalia lahtised meistrivõistlused | 01/19 03:45 | 24 | [169] Stefan Kozlov v Matteo Berrettini [7] | 1-6,6-4,4-6,1-6 | |
| Austraalia lahtised meistrivõistlused | 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.