| Challenger - Gwangju | 05/14 05:00 | 24 | Jea Moon Lee v Yunseong Chung | 6-7,2-6 | |
| Challenger - Busan | 05/10 07:05 | 27 | [95] Ricardas Berankis v Yunseong Chung [270] | 5-7,6-3,6-4 | |
| Challenger - Busan | 05/09 06:45 | 26 | [270] Yunseong Chung v Marcos Baghdatis [133] | 6-2,6-3 | |
| Challenger - Busan | 05/07 04:05 | 25 | [139] Nikola Milojevic v Yunseong Chung [270] | 2-6,6-3,5-7 | |
| Challenger - Busan | 05/06 04:10 | 24 | [271] Yunseong Chung v Zhe Li [248] | 3-6,6-3,6-4 | |
| Challenger - Seoul | 05/02 04:00 | 26 | [227] Yasutaka Uchiyama v Yunseong Chung [271] | 6-4,6-4 | |
| Challenger - Seoul | 05/01 05:20 | 25 | [271] Yunseong Chung v Yuichi Sugita [182] | 6-2,6-3 | |
| Challenger - Seoul | 04/29 07:55 | 24 | [277] Stephane Robert v Yunseong Chung [271] | 6-1,2-6,4-6 | |
| Challenger - Nanchang | 04/23 05:55 | 25 | [208] Adam Pavlasek v Yunseong Chung [267] | 6-3,6-2 | |
| Challenger - Nanchang | 04/22 04:45 | 24 | Rio Noguchi v Yunseong Chung | 4-6,3-6 | |
| Challenger - Anning | 04/16 04:30 | 25 | [213] Adam Pavlasek v Yunseong Chung [261] | Retired | |
| Challenger - Anning | 04/15 03:15 | 24 | Yunseong Chung v Hanyi Liu | 6-1,6-3 | |
| Challenger - Taipei | 04/08 08:20 | 24 | [263] Yunseong Chung v Maverick Banes [272] | 6-2,6-7,4-6 | |
| Challenger - Zhangjiagang | 03/21 02:00 | 26 | [223] Viktor Galovic v Yunseong Chung [266] | 6-3,6-2 | |
| Challenger - Zhangjiagang | 03/20 02:00 | 25 | [266] Yunseong Chung v Yuichi Sugita [178] | 4-6,7-5,6-2 | |
| Challenger - Zhangjiagang | 03/19 03:15 | 24 | [266] Yunseong Chung v Fajing Sun [329] | 6-4,6-4 | |
| Challenger - Shenzhen | 03/14 02:30 | 26 | [280] Yunseong Chung v Stefano Napolitano [229] | 7-5,2-6,6-7 | |
| Challenger - Shenzhen | 03/12 08:55 | 25 | [180] Rudolf Molleker v Yunseong Chung [280] | 4-6,1-6 | |
| Challenger - Shenzhen | 03/11 05:10 | 24 | [280] Yunseong Chung v Mohamed Safwat [216] | 6-3,6-1 | |
| Challenger - Zhuhai | 03/07 08:50 | 26 | [280] Yunseong Chung v Marcos Baghdatis [129] | 4-6,2-6 | |
| Challenger - Zhuhai | 03/06 07:20 | 25 | [213] Viktor Galovic v Yunseong Chung [280] | 3-6,4-6 | |
| Challenger - Zhuhai | 03/05 03:45 | 24 | [280] Yunseong Chung v Harri Heliovaara [374] | 7-5,6-2 | |
| Challenger - Yokohama | 02/25 02:40 | 24 | [280] Yunseong Chung v Tsung-Hua Yang [287] | 4-6,3-6 | |
| Challenger - Bangkok 1A | 02/19 03:00 | 25 | [213] Gianluca Mager v Yunseong Chung [280] | 6-4,6-4 | |
| Challenger - Bangkok 1A | 02/18 05:20 | 24 | [280] Yunseong Chung v Pedro Cachin [235] | 6-2,6-1 | |
| Challenger - Launceston | 01/30 02:40 | 25 | [278] Yunseong Chung v Lorenzo Giustino [227] | 3-6,7-6,3-6 | |
| Challenger - Launceston | 01/28 05:55 | 24 | Yunseong Chung v Rubin Statham | 6-4,6-3 | |
| Challenger - Burnie | 01/21 23:00 | 25 | [277] Yunseong Chung v Lorenzo Giustino [222] | 2-6,3-6 | |
| Challenger - Burnie | 01/21 00:30 | 24 | [415] Jordi Samper-Montana v Yunseong Chung [277] | 5-7,1-6 | |
| Challenger - Canberra | 01/07 00:40 | 25 | [274] Yunseong Chung v Brydan Klein [407] | 6-7,7-6,0-6 |
Chung Yun-seong (kor.: 정윤성; * 27. März 1998 in Seoul) ist ein südkoreanischer Tennisspieler.