Nombre: Stefan Kozlov
PaÃs: USA
Fecha de nacimiento: 01.02.98, 28 años
ATP ranking: 292
TOP posición de la clasificación: 103 (18.07.22, 533 puntos)
Puntos: 181
Dinero del premio: 1079127 $
Partidos totales: 671
ganar: 386
%: 57.53 %
PaÃs: USA
Fecha de nacimiento: 01.02.98, 28 años
ATP ranking: 292
TOP posición de la clasificación: 103 (18.07.22, 533 puntos)
Puntos: 181
Dinero del premio: 1079127 $
Partidos totales: 671
ganar: 386
%: 57.53 %
| año | resumen | DifÃcil | Arcilla | I. difÃcil | Alfombra | Césped | AcrÃlico |
| 2026 | 17/15 | 5/6 | 5/5 | 7/4 | 0/0 | 0/0 | 0/0 |
| 2025 | 28/12 | 12/6 | 6/2 | 10/3 | 0/0 | 0/1 | 0/0 |
| 2024 | 37/20 | 16/9 | 17/8 | 4/3 | 0/0 | 0/0 | 0/0 |
| 2023 | 6/12 | 1/6 | 0/0 | 5/6 | 0/0 | 0/0 | 0/0 |
| 2022 | 21/34 | 14/18 | 0/5 | 4/5 | 0/0 | 3/6 | 0/0 |
| 2021 | 41/15 | 20/12 | 5/2 | 16/1 | 0/0 | 0/0 | 0/0 |
| 2020 | 13/13 | 7/8 | 0/0 | 6/5 | 0/0 | 0/0 | 0/0 |
| 2019 | 22/18 | 14/9 | 4/4 | 4/5 | 0/0 | 0/0 | 0/0 |
| 2018 | 13/26 | 4/12 | 7/6 | 1/4 | 0/0 | 1/4 | 0/0 |
| 2017 | 31/29 | 15/14 | 8/8 | 3/2 | 0/0 | 5/5 | 0/0 |
| 2016 | 58/31 | 28/15 | 10/6 | 16/5 | 0/0 | 4/5 | 0/0 |
| 2015 | 44/27 | 15/12 | 10/5 | 17/8 | 0/0 | 2/2 | 0/0 |
| 2014 | 33/19 | 23/12 | 5/4 | 0/2 | 0/0 | 5/1 | 0/0 |
| 2013 | 17/11 | 3/3 | 11/6 | 0/0 | 0/0 | 3/2 | 0/0 |
| 2012 | 5/3 | 4/2 | 0/0 | 0/0 | 0/0 | 1/1 | 0/0 |
| TOTAL | 386/285 | 181/144 | 88/61 | 93/53 | 0/0 | 24/27 | 0/0 |
| porc. % | 57.53 % | 55.69 % | 59.06 % | 63.7 % | 0 % | 47.06 % | 0 % |
Stefan Kozlov / programado / pasado
| No se encontraron partidos |
Stefan Kozlov form / superficie: DifÃcil
Stefan Kozlov / superficie: DifÃcil
| 24.03.26 | 1er ronda | Andres Martin | Stefan Kozlov | 6-2, 6-2 |  | match details |  Morelia Challenger | DifÃcil |
| 19.03.26 | 2da ronda | Michael Mmoh | Stefan Kozlov | 7-5, 6-2 | | match details | Morelos Challenger | DifÃcil |
| 17.03.26 | 1er ronda | Stefan Kozlov | Alan Magadan | 6-4, 6-4 |  | match details | ||
| 11.03.26 | 1er ronda | Jay Dylan Hara Friend | Stefan Kozlov | 6-2, 4-6, 6-3 | | match details |  Phoenix Challenger | DifÃcil |
| 10.03.26 | calif. | Stefan Kozlov | Marc Polmans | 6-1, 3-6, 6-4 | | match details | ||
| 09.03.26 | c 1 | Stefan Kozlov | Nathan Ponwith | 7-5, 6-4 | | match details | ||
| 21.02.26 | c 1 | Patrick Kypson | Stefan Kozlov | 7-63, 6-0 | | match details | Acapulco | DifÃcil |
| 20.02.26 | 1/4 | Rodrigo Pacheco Mendez | Stefan Kozlov | 6-4, 6-2 | | match details | Metepec Challenger | DifÃcil |
| 18.02.26 | 2da ronda | Stefan Kozlov | Karl Poling | 6-4, 7-64 | | match details | ||
| 16.02.26 | 1er ronda | Stefan Kozlov | Tristan Mccormick | 6-3, 6-74, 6-4 | | match details | ||
| 28.01.26 | 1er ronda | Sho Shimabukuro | Stefan Kozlov | 6-2, 4-6, 7-65 | | match details | San Diego | DifÃcil |
| 04.08.25 | calif. | Tsung-Hao Huang | Stefan Kozlov | 1-6, 7-5, 6-2 | | match details | Chicago Challenger | DifÃcil |
| 03.08.25 | c 1 | Stefan Kozlov | Ramkumar Ramanathan | 6-1, 6-74, 5-3, Ramkumar Ramanathan - retirado | | match details | ||
| 02.06.25 | calif. | Alvin Nicholas Tudorica | Stefan Kozlov | 7-5, 6-3 | | match details | Tyler Challenger | DifÃcil |
| 01.06.25 | c 1 | Stefan Kozlov | Daniel Milavsky | 6-3, 6-77, 6-3 | | match details | ||
| 29.05.25 | 2da ronda | Andres Andrade | Stefan Kozlov | 6-1, 4-6, 7-5 | | match details | Little Rock | DifÃcil |
| 28.05.25 | calif. | Stefan Kozlov | Elmar Ejupovic | 6-4, 7-65 | | match details | ||
| 28.05.25 | 1er ronda | Stefan Kozlov | Aziz Dougaz | 5-7, 6-3, 6-2 | | match details | ||
| 27.05.25 | c 1 | Stefan Kozlov | Kiranpal Pannu | 7-63, 2-6, 6-2 | | match details | ||
| 18.05.25 | fin | Stefan Kozlov | Santiago Rodriguez Taverna | 6-74, 6-4, 6-4 | | match details | M25 Xalapa | DifÃcil |
| 17.05.25 | 1/2 | Stefan Kozlov | Maxwell Mckennon | 2-6, 6-1, 6-4 | | match details | ||
| 16.05.25 | 1/4 | Stefan Kozlov | Aidan Mayo | 6-4, 6-4 | | match details | ||
| 15.05.25 | 2da ronda | Stefan Kozlov | Axel Nefve | 6-4, 6-4 | | match details | ||
| 14.05.25 | 1er ronda | Stefan Kozlov | Marat Sanchez Ballinas | 6-1, 6-1 | | match details | ||
| 02.04.25 | 2da ronda | Rafael Jodar | Stefan Kozlov | 7-5, 3-6, 6-2 | | match details | Cuernavaca Challenger | DifÃcil |
| 31.03.25 | 1er ronda | Stefan Kozlov | Thiago Agustin Tirante | 4-6, 6-4, 6-2 | | match details | ||
| 23.02.25 | calif. | Nishesh Basavareddy | Stefan Kozlov | 6-2, 6-4 | | match details | Acapulco | DifÃcil |
| 22.02.25 | c 1 | Stefan Kozlov | Duarte Vale | 6-1, 6-4 | | match details | ||
| 08.02.25 | c 1 | Zachary Svajda | Stefan Kozlov | 6-3, 6-0 | | match details | Delray Beach | DifÃcil |
| 06.08.24 | 1er ronda | Nishesh Basavareddy | Stefan Kozlov | 2-6, 6-4, 6-2 | | match details | Lincoln Challenger | DifÃcil |
| 05.08.24 | calif. | Stefan Kozlov | Ernesto Escobedo | 6-3, 6-1 | | match details | ||
| 04.08.24 | c 1 | Stefan Kozlov | Collin Altamirano | 6-4, 7-64 | | match details | ||
| 30.07.24 | 1er ronda | Bernard Tomic | Stefan Kozlov | 6-4, 3-6, 6-3 | | match details | Lexington Challenger | DifÃcil |
| 29.07.24 | calif. | Stefan Kozlov | Stefan Dostanic | 7-63, 0-6, 7-5 | | match details | ||
| 28.07.24 | c 1 | Stefan Kozlov | Ryuki Matsuda | 6-2, 6-3 | | match details | ||
| 17.07.24 | 1er ronda | Nicolas Mejia | Stefan Kozlov | 6-1, 6-2 | | match details |  Granby Challenger | DifÃcil |
| 15.07.24 | calif. | Stefan Kozlov | Cooper Williams | 6-1, 7-63 | | match details | ||
| 14.07.24 | c 1 | Stefan Kozlov | Victor Lilov | 6-2, 6-1 | | match details | ||
| 06.07.24 | 1/2 | Nishesh Basavareddy | Stefan Kozlov | 6-2, 2-0, Stefan Kozlov - retirado | | match details | Bloomfield Hills | DifÃcil |
| 05.07.24 | 1/4 | Stefan Kozlov | Jeff Wolf | 6-4, 6-4 | | match details | ||
| 03.07.24 | 2da ronda | Stefan Kozlov | Tung-Lin Wu | 5-7, 6-3, 4-0, Tung-Lin Wu - retirado | | match details | ||
| 02.07.24 | 1er ronda | Stefan Kozlov | Michael Zheng | 4-6, 7-5, 6-1 | | match details | ||
| 01.07.24 | calif. | Stefan Kozlov | William Grant | 6-1, 6-4 | | match details | ||
| 30.06.24 | c 1 | Stefan Kozlov | Nicholas Herdoiza | 6-3, 6-1 | | match details | ||
| 05.06.24 | 2da ronda | Chak Lam Coleman Wong | Stefan Kozlov | 4-6, 6-4, 4-1, Stefan Kozlov - retirado | | match details | Tyler Challenger | DifÃcil |
| 03.06.24 | 1er ronda | Stefan Kozlov | Blaise Bicknell | 6-3, 6-3 | | match details | ||
| 28.05.24 | 1er ronda | Rudy Quan | Stefan Kozlov | 6-1, 7-5 | | match details | Little Rock | DifÃcil |
| 11.02.24 | c 1 | Shintaro Mochizuki | Stefan Kozlov | 6-3, 7-62 | | match details | Delray Beach | DifÃcil |
| 23.01.24 | calif. | Bruno Kuzuhara | Stefan Kozlov | 7-66, 6-4 | | match details | Indian Wells | DifÃcil |
| 21.01.24 | c 1 | Stefan Kozlov | Alafia Ayeni | 6-4, 6-3 | | match details | ||
| 18.01.24 | 2da ronda | Paul Jubb | Stefan Kozlov | 4-6, 6-3, 6-3 | | match details | Indian Wells | DifÃcil |
| 16.01.24 | 1er ronda | Stefan Kozlov | Gabriel Debru | 6-1, 3-6, 6-2 | | match details | ||
| 15.01.24 | c 1 | Stefan Kozlov | Ezekiel Clark | 2-6, 7-67, 6-4 | | match details | ||
| 15.01.24 | calif. | Stefan Kozlov | Edan Leshem | 7-5, 6-3 | | match details | ||
| 25.09.23 | calif. | Stefan Dostanic | Stefan Kozlov | 6-2, 6-1 | | match details | Charleston Challenger | DifÃcil |
| 24.09.23 | c 1 | Stefan Kozlov | Michael Zheng | 7-5, 6-3 | | match details | ||
| 19.08.23 | c 1 | Inaki Montes-De La Torre | Stefan Kozlov | 3-6, 6-1, 6-3 | | match details | Winston-Salem | DifÃcil |
| 06.03.23 | c 1 | Roberto Marcora | Stefan Kozlov | 6-1, 6-3 | | match details | Indian Wells | DifÃcil |
| 11.02.23 | c 1 | Matija Pecotic | Stefan Kozlov | 7-61, 5-5, Stefan Kozlov - retirado | | match details | Delray Beach | DifÃcil |
| 18.01.23 | 1er ronda | Lorenzo Giustino | Stefan Kozlov | 7-62, 2-6, 4-1, Stefan Kozlov - retirado | | match details |  Tenerife 1 | DifÃcil |
| 09.01.23 | c 1 | Oleksii Krutykh | Stefan Kozlov | 7-5, 6-2 | | match details |  Melbourne | DifÃcil |
| 30.10.22 | fin | Tennys Sandgren | Stefan Kozlov | 7-5, 6-3 | | match details | Las Vegas | DifÃcil |
| 29.10.22 | 1/2 | Stefan Kozlov | Steve Johnson | 6-3, 1-6, 7-5 | | match details | ||
| 28.10.22 | 1/4 | Stefan Kozlov | Alexis Galarneau | 6-75, 6-4, 6-3 | | match details | ||
| 27.10.22 | 2da ronda | Stefan Kozlov | Evan Zhu | 7-65, 6-2 | | match details | ||
| 25.10.22 | 1er ronda | Stefan Kozlov | Cannon Kingsley | 7-5, 4-6, 6-1 | | match details | ||
| 11.10.22 | 1er ronda | Sam Riffice | Stefan Kozlov | 3-6, 6-2, 6-3 | | match details | Fairfield Challenger | DifÃcil |
| 06.10.22 | 2da ronda | Alexis Galarneau | Stefan Kozlov | 6-1, 7-5 | | match details | Tiburon Challenger | DifÃcil |
| 04.10.22 | 1er ronda | Stefan Kozlov | Giovanni Oradini | 6-1, 6-4 | | match details | ||
| 19.09.22 | 1er ronda | Jeff Wolf | Stefan Kozlov | 6-2, 7-66 | | match details | San Diego | DifÃcil |
| 15.09.22 | 2da ronda | Yasutaka Uchiyama | Stefan Kozlov | 6-4, 2-0, Stefan Kozlov - retirado | | match details | Cary Challenger | DifÃcil |
| 13.09.22 | 1er ronda | Stefan Kozlov | Cannon Kingsley | 2-6, 6-2, 6-2 | | match details | ||
| 29.08.22 | 1er ronda | Daniil Medvedev | Stefan Kozlov | 6-2, 6-4, 6-0 | | match details | New York | DifÃcil |
| 13.08.22 | c 1 | Dusan Lajovic | Stefan Kozlov | 6-3, 7-5 | | match details | Cincinnati | DifÃcil |
| 10.08.22 | 1er ronda | Ernesto Escobedo | Stefan Kozlov | 6-4, 7-62 | | match details | Chicago Challenger | DifÃcil |
| 01.08.22 | 1er ronda | Jack Draper | Stefan Kozlov | 7-5, 6-2 | | match details | Washington | DifÃcil |
| 23.07.22 | c 1 | Ramkumar Ramanathan | Stefan Kozlov | 6-0, 6-1 | | match details | Atlanta | DifÃcil |
| 21.03.22 | c 1 | Mitchell Krueger | Stefan Kozlov | 6-2, 6-2 | | match details | Miami | DifÃcil |
| 09.03.22 | calif. | Holger Rune | Stefan Kozlov | 6-4, 6-2 | | match details | Indian Wells | DifÃcil |
| 08.03.22 | c 1 | Stefan Kozlov | Sebastian Sec | 6-3, 6-74, 6-2 | | match details | ||
| 23.02.22 | 2da ronda | Rafael Nadal | Stefan Kozlov | 6-0, 6-3 | | match details | Acapulco | DifÃcil |
| 21.02.22 | 1er ronda | Stefan Kozlov | Grigor Dimitrov | 7-68, 5-7, 6-3 | | match details | ||
| 20.02.22 | calif. | Oscar Otte | Stefan Kozlov | 6-1, 0-6, 7-62 | | match details | ||
| 19.02.22 | c 1 | Stefan Kozlov | Steve Johnson | 6-4, 6-3 | | match details | ||
| 18.02.22 | 1/4 | Tommy Paul | Stefan Kozlov | 6-3, 6-1 | | match details | Delray Beach | DifÃcil |
| 16.02.22 | 2da ronda | Stefan Kozlov | Steve Johnson | 6-1, 6-3 | | match details | ||
| 15.02.22 | 1er ronda | Stefan Kozlov | Emilio Gomez | 4-6, 7-5, 6-3 | | match details | ||
| 13.02.22 | calif. | Stefan Kozlov | Bjorn Fratangelo | 6-3, 1-0, Bjorn Fratangelo - retirado | | match details | ||
| 12.02.22 | c 1 | Stefan Kozlov | Go Soeda | 7-5, 6-2 | | match details | ||
| 19.01.22 | 2da ronda | Matteo Berrettini | Stefan Kozlov | 6-1, 4-6, 6-4, 6-1 | | match details | Melbourne | DifÃcil |
| 17.01.22 | 1er ronda | Stefan Kozlov | Jiri Vesely | 7-5, 6-3, 6-4 | | match details | ||
| 09.01.22 | c 1 | Denis Kudla | Stefan Kozlov | 4-6, 7-67, 6-3 | | match details | Sydney | DifÃcil |
| 04.01.22 | 2da ronda | Flavio Cobolli | Stefan Kozlov | 6-4, 3-6, 6-1 | | match details | Bendigo Challenger | DifÃcil |
| 31.10.21 | fin | Jeff Wolf | Stefan Kozlov | 6-4, 6-4 | | match details | Las Vegas | DifÃcil |
| 30.10.21 | 1/2 | Stefan Kozlov | Aleksandar Kovacevic | 6-2, 6-4 | | match details | ||
| 29.10.21 | 1/4 | Stefan Kozlov | Emilio Gomez | 7-63, 6-4 | | match details | ||
| 28.10.21 | 2da ronda | Stefan Kozlov | Aidan Mchugh | 6-2, 5-7, 7-613 | | match details | ||
| 26.10.21 | 1er ronda | Stefan Kozlov | Mukund Sasikumar | 6-2, 6-4 | | match details | ||
| 06.10.21 | calif. | Christopher Eubanks | Stefan Kozlov | 2-6, 6-0, 7-5 | | match details | Indian Wells | DifÃcil |
| 05.10.21 | c 1 | Stefan Kozlov | Jason Jung | 6-3, 3-6, 5-2, Jason Jung - retirado | | match details | ||
| 14.09.21 | 1er ronda | Zachary Svajda | Stefan Kozlov | 7-5, 2-0, Stefan Kozlov - retirado | | match details | Cary 2 | DifÃcil |
| 02.09.21 | 2da ronda | Fernando Verdasco | Stefan Kozlov | 1-6, 7-66, 6-2 | | match details | Mallorca Challenger | DifÃcil |
| 31.08.21 | 1er ronda | Stefan Kozlov | Daniel Rincon | 6-3, 1-6, 6-1 | | match details | ||
| 24.08.21 | c 1 | Bernabe Zapata Miralles | Stefan Kozlov | 7-5, 1-6, 6-3 | | match details | New York | DifÃcil |
| 29.07.21 | 2da ronda | Alejandro Tabilo | Stefan Kozlov | 6-2, 6-2 | | match details | Lexington Challenger | DifÃcil |
| 27.07.21 | 1er ronda | Stefan Kozlov | Christopher Eubanks | 7-63, 7-66 | | match details | ||
| 26.07.21 | calif. | Stefan Kozlov | Edan Leshem | 3-6, 7-64, 6-1 | | match details | ||
| 25.07.21 | c 1 | Stefan Kozlov | Sam Riffice | 6-2, 6-3 | | match details | ||
| 24.07.21 | 1/2 | Ramkumar Ramanathan | Stefan Kozlov | 1-6, 6-3, 6-1 | | match details | Cary Challenger | DifÃcil |
| 23.07.21 | 1/4 | Stefan Kozlov | Christopher Eubanks | 5-7, 6-1, 6-3 | | match details | ||
| 21.07.21 | 2da ronda | Stefan Kozlov | Maxime Cressy | 3-6, 6-3, 6-4 | | match details | ||
| 19.07.21 | 1er ronda | Stefan Kozlov | Donald Young | 4-6, 6-4, 6-4 | | match details | ||
| 16.06.21 | 1er ronda | Michail Pervolarakis | Stefan Kozlov | 7-64, 6-4 | | match details | M25 Tulsa | DifÃcil |
| 08.06.21 | 1er ronda | Thiago Agustin Tirante | Stefan Kozlov | 6-3, 6-1 | | match details | Orlando 2 | DifÃcil |
| 07.06.21 | calif. | Stefan Kozlov | Adrian Andreev | 4-6, 6-4, 6-4 | | match details | ||
| 06.06.21 | c 1 | Stefan Kozlov | Robert Galloway | 6-4, 7-64 | | match details | ||
| 02.06.21 | 1er ronda | Thai Kwiatkowski | Stefan Kozlov | 6-2, 6-1 | | match details | Little Rock | DifÃcil |
| 31.05.21 | calif. | Stefan Kozlov | Strong Kirchheimer | 6-3, 6-2 | | match details | ||
| 30.05.21 | c 1 | Stefan Kozlov | Brian Battistone | 6-2, 6-2 | | match details | ||
| 16.03.21 | 1er ronda | Cameron Norrie | Stefan Kozlov | 6-3, 6-3 | | match details | Acapulco | DifÃcil |
| 15.03.21 | calif. | Stefan Kozlov | Botic Van De Zandschulp | 6-3, 1-0, Botic Van De Zandschulp - retirado | | match details | ||
| 14.03.21 | c 2 | Stefan Kozlov | Joao Sousa | 6-2, 2-6, 6-3 | | match details | ||
| 13.03.21 | c 1 | Stefan Kozlov | Jordi Arconada | 6-4, 6-1 | | match details | ||
| 06.01.21 | calif. | Donald Young | Stefan Kozlov | 4-6, 6-4, 6-4 | | match details | Delray Beach | DifÃcil |
| 05.01.21 | c 1 | Stefan Kozlov | Johannes Haerteis | 5-0, Johannes Haerteis - retirado | | match details | ||
| 17.11.20 | 1er ronda | Thiago Moura Monteiro | Stefan Kozlov | 6-1, 6-3 | | match details | Orlando Challenger | DifÃcil |
| 15.11.20 | calif. | Stefan Kozlov | Kevin King | 7-61, 6-77, 6-4 | | match details | ||
| 14.11.20 | c 1 | Stefan Kozlov | Martin Damm | 6-4, 6-72, 6-4 | | match details | ||
| 07.11.20 | c 1 | Nicolas Mejia | Stefan Kozlov | 2-6, 7-5, 7-62 | | match details | Cary Challenger | DifÃcil |
| 04.10.20 | 1/2 | Nuno Borges | Stefan Kozlov | 6-3, 7-5 | | match details |  M25 Porto | DifÃcil |
| 03.10.20 | 1/4 | Stefan Kozlov | Dayne Kelly | 6-2, 6-2 | | match details | ||
| 01.10.20 | 2da ronda | Stefan Kozlov | Adrian Menendez-Maceiras | 7-5, 6-3 | | match details | ||
| 30.09.20 | 1er ronda | Stefan Kozlov | Michail Pervolarakis | 6-1, 6-4 | | match details | ||
| 24.09.20 | 1er ronda | Stefan Kozlov | Alexis Musialek | 7-5, 6-0 | | match details | M15 Castelo | DifÃcil |
| 24.09.20 | 2da ronda | Nicolas Moreno De Alboran | Stefan Kozlov | 6-3, 6-4 | | match details | ||
| 09.09.20 | 1er ronda | Robert Strombachs | Stefan Kozlov | 6-4, 6-2 | | match details | M15 Sintra | DifÃcil |
| 18.02.20 | 1er ronda | Ugo Humbert | Stefan Kozlov | 6-75, 6-3, 6-1 | | match details | Delray Beach | DifÃcil |
| 16.02.20 | calif. | Emilio Gomez | Stefan Kozlov | 6-3, 6-2 | | match details | ||
| 15.02.20 | c 1 | Stefan Kozlov | Alex Bolt | 4-6, 6-4, 6-2 | | match details | ||
| 23.01.20 | 1er ronda | Maximiliano Estevez | Stefan Kozlov | 5-7, 1-1, Stefan Kozlov - retirado | | match details | M15 Cancun | DifÃcil |
| 18.10.19 | 1/4 | James Duckworth | Stefan Kozlov | 6-2, 6-3 | | match details | Las Vegas | DifÃcil |
| 17.10.19 | 3er ronda | Stefan Kozlov | Alexander Ritschard | 5-7, 6-4, 6-1 | | match details | ||
| 15.10.19 | 2da ronda | Stefan Kozlov | Blaz Rola | 6-4, 6-3 | | match details | ||
| 14.10.19 | 1er ronda | Stefan Kozlov | Evan Song | 6-4, 6-3 | | match details | ||
| 20.08.19 | c 1 | Egor Gerasimov | Stefan Kozlov | 6-4, 6-4 | | match details | New York | DifÃcil |
| 23.07.19 | 1er ronda | Roberto Ortega-Olmedo | Stefan Kozlov | 6-75, 3-0, Stefan Kozlov - retirado | | match details | Binghamton Challenger | DifÃcil |
| 11.07.19 | 3er ronda | Jason Murray Kubler | Stefan Kozlov | 6-2, 6-3 | | match details | Winnetka Challenger | DifÃcil |
| 09.07.19 | 2da ronda | Stefan Kozlov | Adrian Menendez-Maceiras | 7-5, 4-0, Adrian Menendez-Maceiras - retirado | | match details | ||
| 08.07.19 | 1er ronda | Stefan Kozlov | Evgeny Karlovskiy | 6-2, 6-4 | | match details | ||
| 05.06.19 | 2da ronda | Zhe Li | Stefan Kozlov | 6-3, 5-7, 6-0 | | match details | Little Rock | DifÃcil |
| 04.06.19 | 1er ronda | Stefan Kozlov | Garrett Johns | 7-5, 6-3 | | match details | ||
| 24.03.19 | fin | Alexander Ritschard | Stefan Kozlov | 6-2, 0-6, 7-65 | | match details | M25 Calabasas | DifÃcil |
| 23.03.19 | 1/2 | Stefan Kozlov | Drew Baird | 6-2, 6-2 | | match details | ||
| 22.03.19 | 1/4 | Stefan Kozlov | Jonathan Gray | 6-2, 6-1 | | match details | ||
| 21.03.19 | 2da ronda | Stefan Kozlov | Isaiah Strode | 7-63, 6-0 | | match details | ||
| 19.03.19 | 1er ronda | Stefan Kozlov | Ronnie Schneider | 6-2, 6-0 | | match details | ||
| 21.02.19 | 3er ronda | Roberto Quiroz | Stefan Kozlov | 6-4, 7-65 | | match details | Morelos Challenger | DifÃcil |
| 19.02.19 | 2da ronda | Stefan Kozlov | Alexander Sarkissian | 6-4, 3-0, Alexander Sarkissian - retirado | | match details | ||
| 18.02.19 | 1er ronda | Stefan Kozlov | Evan Song | 7-5, 6-3 | | match details | ||
| 21.01.19 | calif. | Maxime Cressy | Stefan Kozlov | 7-5, 6-1 | | match details | Newport Beach | DifÃcil |
| 03.01.19 | 3er ronda | Nino Serdarusic | Stefan Kozlov | 6-2, 7-5 | | match details | Orlando Challenger | DifÃcil |
| 02.01.19 | 2da ronda | Stefan Kozlov | Mitchell Krueger | 6-2, 5-7, 6-3 | | match details | ||
| 31.12.18 | 1er ronda | Stefan Kozlov | Alejandro Gonzalez | 6-2, 4-6, 6-4 | | match details | ||
| 13.11.18 | 1er ronda | Paolo Lorenzi | Stefan Kozlov | 6-4, 3-6, 6-4 | | match details | Houston Challenger | DifÃcil |
| 23.10.18 | 1er ronda | Kamil Majchrzak | Stefan Kozlov | 6-0, 6-2 | | match details | Las Vegas | DifÃcil |
| 01.10.18 | 1er ronda | Lucas Gomez | Stefan Kozlov | 6-2, 6-4 | | match details | Monterrey Challenger | DifÃcil |
| 06.08.18 | 1er ronda | Kaichi Uchida | Stefan Kozlov | 6-4, 6-1 | | match details | Aptos Challenger | DifÃcil |
| 28.07.18 | c 1 | Jared Hiltzik | Stefan Kozlov | 6-3, 6-3 | | match details | Washington | DifÃcil |
| 19.03.18 | c 1 | Cameron Norrie | Stefan Kozlov | 6-1, 2-0, Stefan Kozlov - retirado | | match details | Miami | DifÃcil |
| 06.03.18 | c 1 | Adrian Menendez-Maceiras | Stefan Kozlov | 6-2, 7-68 | | match details | Indian Wells | DifÃcil |
| 28.02.18 | 2da ronda | Peter Polansky | Stefan Kozlov | 6-2, 6-4 | | match details | Indian Wells | DifÃcil |
| 27.02.18 | 1er ronda | Stefan Kozlov | Mirza Basic | 7-5, 6-4 | | match details | ||
| 17.02.18 | c 1 | Ramkumar Ramanathan | Stefan Kozlov | 6-3, 6-2 | | match details | Delray Beach | DifÃcil |
| 24.01.18 | 2da ronda | Miomir Kecmanovic | Stefan Kozlov | 6-3, 6-4 | | match details | Newport Beach | DifÃcil |
| 22.01.18 | 1er ronda | Stefan Kozlov | Guilherme Clezar | 6-2, 6-3 | | match details | ||
| 14.01.18 | calif. | Dustin Brown | Stefan Kozlov | 6-4, 3-6, 6-3 | | match details | Melbourne | DifÃcil |
| 11.01.18 | c 2 | Stefan Kozlov | Yannick Hanfmann | 4-6, 7-62, 6-4 | | match details | ||
| 10.01.18 | c 1 | Stefan Kozlov | Blake Ellis | 7-63, 4-6, 7-63 | | match details | ||
| 01.01.18 | 1er ronda | Corentin Moutet | Stefan Kozlov | 7-64, 3-6, 6-2 | | match details |  Noumea Challenger | DifÃcil |
| 22.10.17 | fin | Stefan Kozlov | Liam Broady | 3-6, 7-5, 6-4 | | match details | Las Vegas | DifÃcil |
| 21.10.17 | 1/2 | Stefan Kozlov | Tennys Sandgren | 6-3, 7-66 | | match details | ||
| 20.10.17 | 1/4 | Stefan Kozlov | Kevin King | 6-2, 6-3 | | match details | ||
| 18.10.17 | 2da ronda | Stefan Kozlov | Dominik Koepfer | 6-4, 6-1 | | match details | ||
| 16.10.17 | 1er ronda | Stefan Kozlov | Jc Aragone | 7-5, 6-3 | | match details | ||
| 10.10.17 | 1er ronda | Mackenzie Mcdonald | Stefan Kozlov | 6-4, 5-7, 6-1 | | match details | Fairfield Challenger | DifÃcil |
| 06.10.17 | 1/4 | Darian King | Stefan Kozlov | 6-4, 6-4 | | match details | Stockton Challenger | DifÃcil |
| 04.10.17 | 2da ronda | Stefan Kozlov | Denis Kudla | 6-4, 6-4 | | match details | ||
| 02.10.17 | 1er ronda | Stefan Kozlov | Brayden Schnur | 6-3, 6-2 | | match details | ||
| 22.08.17 | c 1 | Guido Andreozzi | Stefan Kozlov | 6-4, 6-1 | | match details | New York | DifÃcil |
| 14.08.17 | 1er ronda | Sam Querrey | Stefan Kozlov | 6-3, 6-0 | | match details | Cincinnati | DifÃcil |
| 31.07.17 | 1er ronda | Yuki Bhambri | Stefan Kozlov | 7-5, 2-0, Stefan Kozlov - retirado | | match details | Washington | DifÃcil |
| 24.07.17 | 1er ronda | Quentin Halys | Stefan Kozlov | 7-5, 7-67 | | match details | Atlanta | DifÃcil |
| 23.07.17 | calif. | Stefan Kozlov | Brydan Klein | 6-79, 6-2, 7-64 | | match details | ||
| 22.07.17 | c 1 | Stefan Kozlov | Catalin-Ionut Gard | 6-3, 6-1 | | match details | ||
| 30.03.17 | 2da ronda | Rajeev Ram | Stefan Kozlov | 6-1, 7-64 | | match details | Leon Challenger | DifÃcil |
| 29.03.17 | 1er ronda | Stefan Kozlov | Danilo Petrovic | 6-4, 6-2 | | match details | ||
| 21.03.17 | calif. | Jared Donaldson | Stefan Kozlov | 7-5, 6-3 | | match details | Miami | DifÃcil |
| 20.03.17 | c 1 | Stefan Kozlov | Nicola Kuhn | 6-3, 3-6, 6-3 | | match details | ||
| 10.03.17 | 1er ronda | Donald Young | Stefan Kozlov | 7-5, 7-65 | | match details | Indian Wells | DifÃcil |
| 27.02.17 | 1er ronda | Ernesto Escobedo | Stefan Kozlov | 6-1, 2-6, 6-0 | | match details | Acapulco | DifÃcil |
| 26.02.17 | calif. | Stefan Kozlov | Jared Donaldson | 7-5, 6-3 | | match details | ||
| 25.02.17 | c 1 | Stefan Kozlov | Hyeon Chung | 6-2, 6-2 | | match details | ||
| 21.02.17 | 1er ronda | Steve Johnson | Stefan Kozlov | 6-1, 6-4 | | match details | Delray Beach | DifÃcil |
| 17.02.17 | 1/4 | Teimuraz Gabashvili | Stefan Kozlov | 6-3, 6-1 | | match details | Tempe Challenger | DifÃcil |
| 15.02.17 | 2da ronda | Stefan Kozlov | Roberto Quiroz | 6-4, 7-65 | | match details | ||
| 13.02.17 | 1er ronda | Stefan Kozlov | Bradley Klahn | 6-1, 7-5 | | match details | ||
| 11.01.17 | c 1 | Yuki Bhambri | Stefan Kozlov | 6-1, 6-4 | | match details | Melbourne | DifÃcil |
| 31.12.16 | c 1 | John-Patrick Smith | Stefan Kozlov | 6-2, 6-3 | | match details | Brisbane | DifÃcil |
| 30.10.16 | fin | Yen-Hsun Lu | Stefan Kozlov | 6-0, 6-1 | | match details |  Suzhou Challenger | DifÃcil |
| 29.10.16 | 1/2 | Stefan Kozlov | Alexander Kudryavtsev | 6-3, 0-1, Alexander Kudryavtsev - retirado | | match details | ||
| 28.10.16 | 1/4 | Stefan Kozlov | Sergiy Stakhovsky | 3-6, 6-2, 7-5 | | match details | ||
| 27.10.16 | 2da ronda | Stefan Kozlov | Cheong-Eui Kim | 6-4, 6-3 | | match details | ||
| 25.10.16 | 1er ronda | Stefan Kozlov | Yecong He | 5-7, 6-0, 6-4 | | match details | ||
| 21.10.16 | 1/4 | Yen-Hsun Lu | Stefan Kozlov | 3-6, 6-4, 6-4 | | match details | Ningboo Challenger | DifÃcil |
| 20.10.16 | 2da ronda | Stefan Kozlov | Di Wu | 7-64, 6-3 | | match details | ||
| 18.10.16 | 1er ronda | Stefan Kozlov | Jimmy Wang | 6-2, 6-4 | | match details | ||
| 10.10.16 | 1er ronda | Taro Daniel | Stefan Kozlov | 6-4, 6-3 | | match details |  Ho Chi | DifÃcil |
| 28.09.16 | 2da ronda | Michael Mmoh | Stefan Kozlov | 7-5, 6-4 | | match details | Tiburon Challenger | DifÃcil |
| 26.09.16 | 1er ronda | Stefan Kozlov | Guilherme Clezar | 6-2, 6-2 | | match details | ||
| 16.09.16 | 1/4 | Ernesto Escobedo | Stefan Kozlov | 3-6, 6-1, 6-2 | | match details | Cary Challenger | DifÃcil |
| 15.09.16 | 2da ronda | Stefan Kozlov | Philip Bester | 6-4, 6-1 | | match details | ||
| 13.09.16 | 1er ronda | Stefan Kozlov | Erik Crepaldi | 3-6, 6-4, 6-2 | | match details | ||
| 24.08.16 | c 1 | Michael Berrer | Stefan Kozlov | 2-6, 7-65, 6-2 | | match details | New York | DifÃcil |
| 14.08.16 | calif. | Malek Jaziri | Stefan Kozlov | 6-4, 6-2 | | match details | Cincinnati | DifÃcil |
| 14.08.16 | c 1 | Stefan Kozlov | Damir Dzumhur | 6-4, 3-6, 7-5 | | match details | ||
| 09.08.16 | 1er ronda | Mackenzie Mcdonald | Stefan Kozlov | 6-1, 6-4 | | match details | Aptos Challenger | DifÃcil |
| 28.07.16 | 2da ronda | Alex Kuznetsov | Stefan Kozlov | 3-6, 6-3, 6-4 | | match details | Lexington Challenger | DifÃcil |
| 26.07.16 | 1er ronda | Stefan Kozlov | Andrey Golubev | 6-2, 6-2 | | match details | ||
| 22.07.16 | 1/4 | Darian King | Stefan Kozlov | 6-2, 4-1, Stefan Kozlov - retirado | | match details | Binghamton Challenger | DifÃcil |
| 20.07.16 | 2da ronda | Stefan Kozlov | Daniel Nguyen | 7-67, 6-4 | | match details | ||
| 19.07.16 | 1er ronda | Stefan Kozlov | Dennis Nevolo | 3-6, 7-5, 6-0 | | match details | ||
| 06.07.16 | 2da ronda | Go Soeda | Stefan Kozlov | 6-3, 6-2 | | match details | Winnetka Challenger | DifÃcil |
| 05.07.16 | 1er ronda | Stefan Kozlov | Sekou Bangoura | 6-4, 3-6, 6-2 | | match details | ||
| 17.04.16 | fin | Stefan Kozlov | Eric Quigley | 6-73, 6-3, 7-610 | | match details | USA F13 | DifÃcil |
| 16.04.16 | 1/2 | Stefan Kozlov | Tennys Sandgren | 6-2, 6-4 | | match details | ||
| 15.04.16 | 1/4 | Stefan Kozlov | Evan King | 7-5, 6-4 | | match details | ||
| 14.04.16 | 2da ronda | Stefan Kozlov | Sebastian Fanselow | 6-2, 6-2 | | match details | ||
| 13.04.16 | 1er ronda | Stefan Kozlov | Jeff Wolf | 6-1, 6-3 | | match details | ||
| 10.04.16 | fin | Malek Jaziri | Stefan Kozlov | 6-2, 6-4 | | match details | Le Gosier | DifÃcil |
| 09.04.16 | 1/2 | Stefan Kozlov | Yoshihito Nishioka | 3-6, 7-5, 6-3 | | match details | ||
| 08.04.16 | 1/4 | Stefan Kozlov | Vincent Millot | 5-7, 7-5, 6-2 | | match details | ||
| 07.04.16 | 2da ronda | Stefan Kozlov | Constant Lestienne | 6-2, 3-6, 6-1 | | match details | ||
| 05.04.16 | 1er ronda | Stefan Kozlov | Austin Krajicek | 6-3, 6-4 | | match details | ||
| 22.03.16 | 1er ronda | Ernesto Escobedo | Stefan Kozlov | 6-3, 6-4 | | match details | USA F11 | DifÃcil |
| 26.01.16 | 1er ronda | Nicolas Meister | Stefan Kozlov | 6-3, 6-1 | | match details | Maui Challenger | DifÃcil |
| 13.01.16 | 1er ronda | Michael Mmoh | Stefan Kozlov | 7-5, 6-4 | | match details | USA F2 | DifÃcil |
| 10.01.16 | fin | Stefan Kozlov | Philip Bester | 7-67, 6-73, 6-3 | | match details | USA F1 | DifÃcil |
| 09.01.16 | 1/2 | Stefan Kozlov | Tennys Sandgren | 6-1, 6-1 | | match details | ||
| 08.01.16 | 2da ronda | Stefan Kozlov | Max De Vroome | 6-3, 6-3 | | match details | ||
| 08.01.16 | 1/4 | Stefan Kozlov | Gianluigi Quinzi | 6-3, 3-6, 6-1 | | match details | ||
| 06.01.16 | 1er ronda | Stefan Kozlov | Jean-Yves Aubone | 6-0, 7-5 | | match details | ||
| 14.09.15 | 1er ronda | Austin Krajicek | Stefan Kozlov | 7-5, 2-6, 6-2 | | match details | Cary Challenger | DifÃcil |
| 26.08.15 | c 1 | Guido Andreozzi | Stefan Kozlov | 6-2, 5-7, 6-3 | | match details | New York | DifÃcil |
| 15.08.15 | c 1 | Yen-Hsun Lu | Stefan Kozlov | 6-4, 6-3 | | match details | Cincinnati | DifÃcil |
| 07.07.15 | 1er ronda | Ryan Harrison | Stefan Kozlov | 6-4, 6-4 | | match details | Winnetka Challenger | DifÃcil |
| 18.05.15 | 1er ronda | Stefan Kozlov | Ivar Aramburu Contreras | 6-4, 6-1 | | match details | Mexico F4 | DifÃcil |
| 18.05.15 | 2da ronda | Stefan Kozlov | Hans Hach Verdugo | 6-3, 3-6, 6-3 | | match details | ||
| 18.05.15 | 1/2 | Darian King | Stefan Kozlov | 6-4, 3-6, 6-4 | | match details | ||
| 18.05.15 | 1/4 | Stefan Kozlov | Jarryd Chaplin | 6-4, 6-4 | | match details | ||
| 11.05.15 | fin | Ivan Endara | Stefan Kozlov | 6-1, 7-63 | | match details | Mexico F3 | DifÃcil |
| 11.05.15 | 2da ronda | Stefan Kozlov | Jarryd Chaplin | 6-4, 6-3 | | match details | ||
| 11.05.15 | 1/4 | Stefan Kozlov | Carlos Ramirez Utermann | 6-4, 6-2 | | match details | ||
| 11.05.15 | 1/2 | Stefan Kozlov | Luis David Martinez | 6-3, 6-4 | | match details | ||
| 11.05.15 | 1er ronda | Stefan Kozlov | Nikita Kryvonos | 1-6, 7-5, 6-4 | | match details | ||
| 23.03.15 | 1er ronda | Stefan Kozlov | Keanu Ellen | 6-0, 6-0 | | match details | USA F11 | DifÃcil |
| 23.03.15 | 2da ronda | Clay Thompson | Stefan Kozlov | 6-3, 6-3 | | match details | ||
| 16.03.15 | 1er ronda | Stefan Kozlov | Evan Song | 6-3, 6-4 | | match details | USA F10 | DifÃcil |
| 16.03.15 | 2da ronda | Darian King | Stefan Kozlov | 1-6, 6-1, 6-1 | | match details | ||
| 17.02.15 | 1er ronda | Tim Smyczek | Stefan Kozlov | 7-5, 6-2 | | match details | Delray Beach | DifÃcil |
| 30.01.15 | 1/4 | James Mcgee | Stefan Kozlov | 7-66, 6-2 | | match details | Maui Challenger | DifÃcil |
| 29.01.15 | 2da ronda | Stefan Kozlov | Michael Russell | 7-62, 6-3 | | match details | ||
| 28.01.15 | 1er ronda | Stefan Kozlov | Sekou Bangoura | 6-4, 6-2 | | match details | ||
| 12.01.15 | 2da ronda | Stefan Kozlov | Dennis Novikov | 6-0, 6-1 | | match details | USA F4 | DifÃcil |
| 12.01.15 | 1/4 | Frederik Nielsen | Stefan Kozlov | 7-65, 4-6, 6-0 | | match details | ||
| 12.01.15 | 1er ronda | Stefan Kozlov | Karim Hossam | 6-3, 6-1 | | match details | ||
| 05.01.15 | 1/4 | Taylor Harry Fritz | Stefan Kozlov | 6-4, 6-4 | | match details | USA F2 | DifÃcil |
| 05.01.15 | 1er ronda | Stefan Kozlov | Joshua Milton | 6-1, 6-0 | | match details | ||
| 05.01.15 | 2da ronda | Stefan Kozlov | Clay Thompson | 6-2, 2-6, 6-3 | | match details | ||
| 05.10.14 | fin | Sam Querrey | Stefan Kozlov | 6-3, 6-4 | | match details | Sacramento Challenger | DifÃcil |
| 04.10.14 | 1/2 | Stefan Kozlov | Tim Smyczek | 3-6, 6-3, 7-61 | | match details | ||
| 03.10.14 | 1/4 | Stefan Kozlov | Rhyne Williams | 4-6, 7-63, 6-4 | | match details | ||
| 01.10.14 | 2da ronda | Stefan Kozlov | John-Patrick Smith | 6-4, 3-6, 6-4 | | match details | ||
| 29.09.14 | 1er ronda | Stefan Kozlov | Ryan Harrison | 6-1, 3-6, 6-3 | | match details | ||
| 22.09.14 | 2da ronda | Kyle Mcmorrow | Stefan Kozlov | 6-1, 6-4 | | match details | USA F26 | DifÃcil |
| 22.09.14 | 1er ronda | Stefan Kozlov | Patrick Davidson | 6-3, 6-2 | | match details | ||
| 05.09.14 | 1/4 | Quentin Halys | Stefan Kozlov | 3-1, Stefan Kozlov - retirado | | match details | U.S. Open | DifÃcil |
| 04.09.14 | 3er ronda | Stefan Kozlov | Seongchan Hong | 6-3, 2-6, 6-3 | | match details | ||
| 03.09.14 | 2da ronda | Stefan Kozlov | Rafael Matos | 7-62, 6-4 | | match details | ||
| 01.09.14 | 1er ronda | Stefan Kozlov | Jan Zielinski | 6-2, 6-3 | | match details | ||
| 21.08.14 | c 2 | Borna Coric | Stefan Kozlov | 2-6, 6-2, 6-2 | | match details | New York | DifÃcil |
| 20.08.14 | c 1 | Stefan Kozlov | Mitchell Frank | 3-6, 6-0, 6-2 | | match details | ||
| 26.07.14 | c 1 | Samuel Groth | Stefan Kozlov | 3-6, 7-65, 6-4 | | match details | Washington | DifÃcil |
| 20.07.14 | c 2 | Richard Gabb | Stefan Kozlov | 4-6, 6-3, 6-2 | | match details | Lexington Challenger | DifÃcil |
| 19.07.14 | c 1 | Stefan Kozlov | Cesar Ramirez | 6-4, Cesar Ramirez - retirado | | match details | ||
| 07.04.14 | 1/2 | Filip Krajinovic | Stefan Kozlov | 3-6, 6-4, 6-3 | | match details | USA F11 | DifÃcil |
| 07.04.14 | c 2 | Stefan Kozlov | Antony Mendes | 6-0, 6-0 | | match details | ||
| 07.04.14 | calif. | Stefan Kozlov | David Carbo | 6-0, 6-0 | | match details | ||
| 07.04.14 | 1er ronda | Stefan Kozlov | Catalin-Ionut Gard | 6-3, 6-4 | | match details | ||
| 07.04.14 | 1/4 | Stefan Kozlov | Kyle Mcmorrow | 6-2, 2-6, 6-1 | | match details | ||
| 07.04.14 | 2da ronda | Stefan Kozlov | Nicolas Meister | 7-66, 6-2 | | match details | ||
| 17.03.14 | 1er ronda | Stefan Kozlov | Darian King | 6-3, 6-76, 1-0, Darian King - retirado | | match details | USA F9 | DifÃcil |
| 17.03.14 | 2da ronda | Kyle Mcmorrow | Stefan Kozlov | 6-4, 6-4 | | match details | ||
| 10.03.14 | 1er ronda | Darian King | Stefan Kozlov | 6-4, 7-60 | | match details | USA F8 | DifÃcil |
| 10.03.14 | c 2 | Stefan Kozlov | Jc Aragone | 6-3, 7-5 | | match details | ||
| 10.03.14 | calif. | Stefan Kozlov | Alejandro Moreno Figueroa | 6-0, 6-4 | | match details | ||
| 04.03.14 | c 1 | Samuel Groth | Stefan Kozlov | 6-3, 6-4 | | match details | Indian Wells | DifÃcil |
| 15.02.14 | c 1 | Sekou Bangoura | Stefan Kozlov | 6-2, 4-6, 6-3 | | match details | Delray Beach | DifÃcil |
| 25.01.14 | fin | Alexander Zverev | Stefan Kozlov | 6-3, 6-0 | | match details | Australian Open | DifÃcil |
| 24.01.14 | 1/2 | Stefan Kozlov | Quentin Halys | 2-6, 7-63, 6-3 | | match details | ||
| 23.01.14 | 1/4 | Stefan Kozlov | Andrey Rublev | 6-2, 6-1 | | match details | ||
| 22.01.14 | 3er ronda | Stefan Kozlov | Boris Pokotilov | 6-1, 6-2 | | match details | ||
| 20.01.14 | 2da ronda | Stefan Kozlov | Simon Friis Soendergaard | 6-78, 7-5, 6-0 | | match details | ||
| 19.01.14 | 1er ronda | Stefan Kozlov | Blake Mott | 7-65, 4-6, 6-5, Blake Mott - retirado | | match details | ||
| 14.10.13 | 1er ronda | Stefan Kozlov | Kevin King | 6-4, 3-6, 6-3 | | match details | USA F27 | DifÃcil |
| 14.10.13 | 1/4 | Austin Krajicek | Stefan Kozlov | 6-3, 6-2 | | match details | ||
| 14.10.13 | 2da ronda | Stefan Kozlov | Alexander Zverev | 6-2, 6-0 | | match details | ||
| 07.10.13 | 1er ronda | Stefan Kozlov | Luis Fernando Ramirez | 6-1, 6-4 | | match details | USA F26 | DifÃcil |
| 07.10.13 | 2da ronda | Sanam Singh | Stefan Kozlov | 6-4, 6-3 | | match details | ||
| 01.09.13 | 1er ronda | Lucas Miedler | Stefan Kozlov | 6-1, 6-2 | | match details | U.S. Open | DifÃcil |
| 06.09.12 | 3er ronda | Wayne Montgomery | Stefan Kozlov | 6-2, 6-3 | | match details | U.S. Open | DifÃcil |
| 06.09.12 | 2da ronda | Stefan Kozlov | Jordan Thompson | 6-3, 6-76, 6-3 | | match details | ||
| 02.09.12 | 1er ronda | Stefan Kozlov | Stefano Napolitano | 6-3, 4-6, 4-2, Stefano Napolitano - retirado | | match details | ||
| 23.07.12 | 2da ronda | Stefan Kozlov | Harrison Adams | 7-63, 2-6, 7-61 | | match details | USA F21 | DifÃcil |
| 23.07.12 | 1/4 | Jason Jung | Stefan Kozlov | 6-2, 7-61 | | match details | ||
| 23.07.12 | 1er ronda | Stefan Kozlov | Henrik Wiersholm | 0-6, 6-3, 6-3 | | match details |