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Hyeon Chung vs. Stefan Kozlov - H2H matches
| 25.02.17 | q 1 | Stefan Kozlov | Hyeon Chung | 6-2, 6-2 | match details |  Acapulco | Hard |
| 04.07.14 | 1/4 | Stefan Kozlov | Hyeon Chung | 6-4, 7-66 | match details |  Wimbledon (juniors) | Grass |
Hyeon Chung form & Stefan Kozlov form
Hyeon Chung - last matches
 Wuxi Challenger - Hard | ||||
| 05.05.25 qual. | vs. Shintaro Imai | 6-0, 4-6, 3-6 |  | match details |
| 04.05.25 q 1 | vs. Hikaru Shiraishi | 1-6, 6-4, 6-1 |  | match details |
| Guangzhou Challenger - Hard | ||||
| 27.04.25 q 1 | vs. Filip Peliwo | 2-6, 4-6 | | match details |
 Gwangju Challenger - Hard | ||||
| 25.04.25 1/4 | vs. Tristan Schoolkate | 3-6, 1-6 | | match details |
| 24.04.25 2nd round | vs. James Kent Trotter | 6-2, 7-61 | | match details |
| 21.04.25 1st round | vs. Constant Lestienne | 6-1, 6-4 | | match details |
| Busan Challenger - Hard | ||||
| 18.04.25 1/4 | vs. Jason Murray Kubler | 2-6, 4-6 | | match details |
| 17.04.25 2nd round | vs. Li Tu | 3-6, 6-3, 6-4 | | match details |
| 15.04.25 1st round | vs. Emil Ruusuvuori | 6-2, 6-4 | | match details |
 M15 Tsukuba - Hard | ||||
| 30.03.25 1/2 | vs. Yu Hsiou Hsu | 7-64, 6-1 | | match details |
| 30.03.25 fin | vs. Takuya Kumasaka | 6-4, 3-6, 6-1 | | match details |
| 28.03.25 1/4 | vs. Colin Sinclair | 6-2, 6-2 | | match details |
| 27.03.25 2nd round | vs. Yusuke Kusuhara | 6-3, 6-1 | | match details |
| 25.03.25 1st round | vs. Naoki Tajima | 6-3, 6-2 | | match details |
| M15 Nishi - Hard | ||||
| 23.03.25 fin | vs. Takuya Kumasaka | 6-4, 6-0 | | match details |
| 22.03.25 1/2 | vs. Hikaru Shiraishi | 6-2, 6-2 | | match details |
| 21.03.25 1/4 | vs. Moerani Bouzige | 6-4, 6-3 | | match details |
| 20.03.25 2nd round | vs. Tai Sach | 6-2, 6-0 | | match details |
| 19.03.25 1st round | vs. Yusuke Kusuhara | 6-2, 6-0 | | match details |
| M25 Luan - Hard | ||||
| 16.03.25 fin | vs. Oliver Crawford | 6-4, 3-6, 2-6 | | match details |
| 15.03.25 1/2 | vs. Jie Cui | 7-5, 6-3 | | match details |
| 14.03.25 1/4 | vs. Yan Bai | 7-5, 6-0 | | match details |
| 13.03.25 2nd round | vs. Kokoro Isomura | 7-5, 1-6, 6-4 | | match details |
| 12.03.25 1st round | vs. Zhan Zheng | 6-4, 7-62 | | match details |
 M25 Launceston - Hard | ||||
| 26.02.25 1st round | vs. Ajeet Rai | 3-6, 6-4, 4-6 | | match details |
| M25 Burnie - Hard | ||||
| 22.02.25 1/2 | vs. Omar Jasika | 6-72, 5-7 | | match details |
| 21.02.25 1/4 | vs. Shintaro Imai | 6-1, 6-1 | | match details |
| 20.02.25 2nd round | vs. Joshua Charlton | 6-3, 6-1 | | match details |
| 19.02.25 1st round | vs. Yuichiro Inui | 6-4, 6-2 | | match details |
 M25 Bali - Hard | ||||
| 05.01.25 fin | vs. Giles Hussey | 6-1, 6-2 | | match details |
Stefan Kozlov - last matches
| M25 Xalapa - Hard | ||||
| 18.05.25 fin | vs. Santiago Rodriguez Taverna | 6-74, 6-4, 6-4 | | match details |
| 17.05.25 1/2 | vs. Maxwell Mckennon | 2-6, 6-1, 6-4 | | match details |
| 16.05.25 1/4 | vs. Aidan Mayo | 6-4, 6-4 | | match details |
| 15.05.25 2nd round | vs. Axel Nefve | 6-4, 6-4 | | match details |
| 14.05.25 1st round | vs. Marat Sanchez Ballinas | 6-1, 6-1 | | match details |
 Savannah Challenger - Clay | ||||
| 25.04.25 1/4 | vs. Eliot Spizzirri | 3-6, 5-7 | | match details |
| 24.04.25 2nd round | vs. Geoffrey Blancaneaux | 6-1, 3-1, Geoffrey Blancaneaux - retired | | match details |
| 22.04.25 1st round | vs. Max Wiskandt | 6-2, 6-1 | | match details |
| 21.04.25 qual. | vs. Christian Sigsgaard | 6-4, 6-4 | | match details |
| 20.04.25 q 1 | vs. Ryan Fishback | 7-5, 6-3 | | match details |
| Cuernavaca Challenger - Hard | ||||
| 02.04.25 2nd round | vs. Rafael Jodar | 5-7, 6-3, 2-6 | | match details |
| 31.03.25 1st round | vs. Thiago Agustin Tirante | 4-6, 6-4, 6-2 | | match details |
| Acapulco - Hard | ||||
| 23.02.25 qual. | vs. Nishesh Basavareddy | 2-6, 4-6 | | match details |
| 22.02.25 q 1 | vs. Duarte Vale | 6-1, 6-4 | | match details |
| Delray Beach - Hard | ||||
| 08.02.25 q 1 | vs. Zachary Svajda | 3-6, 0-6 | | match details |
| Cleveland Challenger - I. hard | ||||
| 31.01.25 1/4 | vs. Jeff Wolf | 1-6, 3-6 | | match details |
| 30.01.25 2nd round | vs. Kaylan Bigun | 6-2, 6-3 | | match details |
| 28.01.25 1st round | vs. Micah Braswell | 4-6, 6-3, 6-4 | | match details |
 Quimper Challenger - I. hard | ||||
| 22.01.25 1st round | vs. Elmer Moller | 3-6, 5-7 | | match details |
| 21.01.25 qual. | vs. Loann Massard | 4-6, 6-2, 6-4 | | match details |
| 20.01.25 q 1 | vs. Filip Misolic | 6-3, 6-4 | | match details |
| Champaign Challenger - I. hard | ||||
| 12.11.24 1st round | vs. Patrick Kypson | 6-1, 6-73, 4-6 | | match details |
| Sioux Falls - I. hard | ||||
| 24.10.24 2nd round | vs. Murphy Cassone | - Stefan Kozlov - walk over | | match details |
| 21.10.24 1st round | vs. Dmitry Popko | 7-63, 4-6, 6-4 | | match details |
| Lincoln Challenger - Hard | ||||
| 06.08.24 1st round | vs. Nishesh Basavareddy | 6-2, 4-6, 2-6 | | match details |
| 05.08.24 qual. | vs. Ernesto Escobedo | 6-3, 6-1 | | match details |
| 04.08.24 q 1 | vs. Collin Altamirano | 6-4, 7-64 | | match details |
| Lexington Challenger - Hard | ||||
| 30.07.24 1st round | vs. Bernard Tomic | 4-6, 6-3, 3-6 | | match details |
| 29.07.24 qual. | vs. Stefan Dostanic | 7-63, 0-6, 7-5 | | match details |
| 28.07.24 q 1 | vs. Ryuki Matsuda | 6-2, 6-3 | | match details |
