| ITF - M25 - Tsukuba | 03/29 00:30 | 25 | Kazuki Nishiwaki v Yunseong Chung | 6-2,6-3 | |
| Challenger - Pune | 02/28 13:00 | 25 | [241] Miljan Zekic v Yunseong Chung [358] | 6-3,6-4 | |
| Challenger - Pune | 02/27 07:05 | 19 | [299] Jay Clarke v Yunseong Chung [359] | 6-7,3-6 | |
| Challenger - Pune | 02/26 10:30 | 14 | Nitin Kumar Sinha v Yunseong Chung | 2-6,2-6 | |
| Challenger - Bengaluru | 02/20 07:25 | 19 | [320] Nikola Milojevic v Yunseong Chung [359] | 7-6,6-4 | |
| Challenger - Bengaluru | 02/19 11:15 | 14 | [424] Dayne Kelly v Yunseong Chung [360] | 6-7,4-6 | |
| Challenger - Manama | 02/12 08:00 | 14 | Yunseong Chung v Aleksandr Braynin | 5-7,4-6 | |
| Challenger - Concepción | 01/22 15:30 | 14 | [128] Karol Drzewiecki v Yunseong Chung [335] | 6-3,6-2 | |
| Challenger - Piracicaba | 01/17 17:15 | 25 | [385] Carlos Sanchez Jover v Yunseong Chung [335] | 6-3,6-0 | |
| Challenger - Piracicaba | 01/16 15:10 | 19 | [335] Yunseong Chung v Carlos Sanchez Jover [385] | 6-4,6-3 | |
| Challenger - Piracicaba | 01/15 18:15 | 14 | Yunseong Chung v Gonzalo Bueno | 6-2,6-2 | |
| Challenger - Piracicaba | 01/15 17:00 | 14 | Yunseong Chung v Mateus D C C Alves | Cancelled | |
| Challenger - Tigre | 01/10 17:10 | 25 | [332] Yunseong Chung v Edoardo Lavagno [366] | 3-6,1-6 | |
| Challenger - Yokkaichi | 11/25 04:10 | 27 | [361] Yunseong Chung v Yosuke Watanuki [173] | Retired | |
| Challenger - Yokkaichi | 11/24 01:30 | 26 | [361] Yunseong Chung v Mukund Sasikumar [353] | 6-1,6-4 | |
| Challenger - Yokkaichi | 11/21 02:50 | 25 | [248] Dane Sweeny v Yunseong Chung [363] | 5-7,2-6 | |
| Challenger - Kobe | 11/15 02:50 | 25 | [363] Yunseong Chung v Yosuke Watanuki [196] | 2-6,2-6 | |
| Challenger - Kobe | 11/14 02:45 | 19 | [362] Yunseong Chung v Yuta Shimizu [404] | 6-2,7-6 | |
| Challenger - Kobe | 11/13 05:30 | 14 | Yunseong Chung v Duckhee Lee | 6-2,6-0 | |
| Challenger - Yokohama | 11/02 03:25 | 26 | [384] Yunseong Chung v Kaichi Uchida [172] | 6-7,3-6 | |
| Challenger - Yokohama | 11/01 02:55 | 25 | Masamichi Imamura v Yunseong Chung | 3-6,4-6 | |
| Challenger - Busan | 10/20 02:00 | 26 | [470] Seong Chan Hong v Yunseong Chung [395] | 6-3,7-5 | |
| Challenger - Busan | 10/18 06:35 | 25 | [395] Yunseong Chung v Chun Hsin Tseng [86] | 7-5,7-5 | |
| Challenger - Gwangju | 10/04 05:30 | 25 | [397] Yunseong Chung v Jisung Nam [222] | 6-1,3-6,5-7 | |
| Challenger - Gwangju | 10/03 04:00 | 19 | [397] Yunseong Chung v Seita Watanabe [401] | 6-2,7-6 | |
| ATP - Seoul | 09/27 10:00 | 25 | [121] Soonwoo Kwon v Yunseong Chung [426] | 7-6,6-7,6-1 | |
| ATP - Seoul | 09/25 03:50 | 19 | [412] Shintaro Mochizuki v Yunseong Chung [415] | 5-7,4-6 | |
| ATP - Seoul | 09/24 06:55 | 14 | [415] Yunseong Chung v Dalibor Svrcina [212] | 6-3,4-6,6-1 | |
| Challenger - Nonthaburi | 09/05 11:00 | 25 | [242] Yosuke Watanuki v Yunseong Chung [418] | Retired | |
| Challenger - Nonthaburi | 08/30 08:15 | 25 | [418] Yunseong Chung v Billy Harris [305] | 3-6,6-4,4-6 |
Chung Yun-seong (kor.: 정윤성; * 27. März 1998 in Seoul) ist ein südkoreanischer Tennisspieler.