| 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 | |
| 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 (ur. 1 lutego 1998 w Skopju) – amerykański tenisista macedońskiego pochodzenia. Finalista juniorskich wielkoszlemowych turniejów Australian Open 2014 oraz Wimbledonu 2014 w grze pojedynczej, a także Wimbledonu 2014 w grze podwójnej.