| ITF - M25 - Aktobe | 02/19 07:15 | 25 | Riccardo Balzerani v Yunseong Chung | 6-3,4-6,4-6 | |
| ITF - M25 - Aktobe | 02/13 04:55 | 26 | Otto Virtanen v Yunseong Chung | 6-7,6-3,6-2 | |
| ITF - M25 - Aktobe | 02/12 10:40 | 25 | Yaraslav Shyla v Yunseong Chung | 6-7,6-7 | |
| ITF - M25 - Nonthaburi | 02/06 05:30 | 26 | [389] Matija Pecotic v Yunseong Chung [326] | 6-0,6-3 | |
| ITF - M25 - Nonthaburi | 02/05 09:45 | 25 | [439] Calvin Hemery v Yunseong Chung [326] | Retired | |
| Challenger - Bangkok | 01/12 06:40 | 24 | [335] Jack Draper v Yunseong Chung [320] | 7-6,6-3 | |
| Australian Open - Wildcard | 12/07 05:30 | 28 | [321] Yunseong Chung v Tatsuma Ito [148] | 6-1,4-6,4-6 | |
| Australian Open - Wildcard | 12/06 06:00 | 27 | [270] Sasikumar Mukund v Yunseong Chung [321] | 4-6,3-6 | |
| Australian Open - Wildcard | 12/04 04:00 | 26 | [321] Yunseong Chung v Denis Istomin [179] | 7-5,6-3 | |
| Challenger - Kobe | 11/05 05:35 | 25 | [297] Yunseong Chung v Yuichi Sugita [107] | 1-6,4-6 | |
| Challenger - Kobe | 11/04 04:00 | 24 | [297] Yunseong Chung v Yusuke Takahashi [452] | 7-6,7-6 | |
| Challenger - Shenzhen 2 | 10/29 02:00 | 24 | [296] Yunseong Chung v Jonas Forejtek [332] | 4-6,3-6 | |
| Challenger - Liuzhou | 10/23 02:00 | 25 | [297] Yunseong Chung v Alejandro Davidovich Fokina [93] | 5-7,5-7 | |
| Challenger - Liuzhou | 10/21 06:00 | 24 | [297] Yunseong Chung v Takuto Niki [481] | 6-2,7-6 | |
| Challenger - Ningbo | 10/16 03:35 | 25 | [281] Yunseong Chung v Danilo Petrovic [195] | 3-6,3-6 | |
| Challenger - Ningbo | 10/15 02:00 | 24 | Yunseong Chung v Aoran Wang | 1-6,6-2,6-1 | |
| Challenger - Kaohsiung | 09/17 01:30 | 24 | Yunseong Chung v Miliaan Niesten | 4-6,3-6 | |
| Challenger - Jinan | 09/02 02:00 | 24 | [263] Yunseong Chung v Kaichi Uchida [259] | 2-6,4-6 | |
| US Open | 08/20 16:20 | 44 | [102] Salvatore Caruso v Yunseong Chung [259] | 6-0,6-2 | |
| Challenger - Yokkaichi | 08/08 02:00 | 26 | [269] Yunseong Chung v Saketh Myneni [271] | 3-6,6-3,3-6 | |
| Challenger - Yokkaichi | 08/06 07:20 | 25 | Yunseong Chung v Alafia Ayeni | 7-6,6-3 | |
| Challenger - Chengdu | 07/31 04:55 | 25 | [237] Yunseong Chung v Dayne Kelly [475] | 3-6,6-4,2-6 | |
| Challenger - Nur-Sultan | 07/19 06:45 | 27 | [246] Yunseong Chung v Aleksandar Vukic [290] | 3-6,2-6 | |
| Challenger - Nur-Sultan | 07/18 05:00 | 26 | [246] Yunseong Chung v Goncalo Oliveira [260] | 6-7,7-5,6-4 | |
| Challenger - Nur-Sultan | 07/17 05:00 | 25 | [246] Yunseong Chung v Edan Leshem [398] | 6-4,4-6,6-4 | |
| Challenger - Nottingham | 06/11 18:40 | 24 | Jack Draper v Yunseong Chung | 5-7,6-0,6-2 | |
| Challenger - Surbiton | 06/05 13:15 | 25 | [249] Yunseong Chung v Peter Polansky [123] | 3-6,3-6 | |
| Challenger - Surbiton | 06/04 10:00 | 24 | Andrew Watson v Yunseong Chung | 2-6,2-6 | |
| Challenger - Gwangju | 05/16 05:45 | 26 | [253] Yunseong Chung v Evgeny Donskoy [150] | 5-7,4-6 | |
| Challenger - Gwangju | 05/15 03:40 | 25 | [241] Duckhee Lee v Yunseong Chung [253] | 4-6,2-6 |
Chung Yun-seong (kor.: 정윤성; * 27. März 1998 in Seoul) ist ein südkoreanischer Tennisspieler.