| 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 | |
| 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 |
Wikipedia - Chung Yun-seong
Chung Yun-seong (Korean: 정윤성; born 27 March 1998) is a South Korean tennis player.
Chung has a career high ATP singles ranking of No. 233 achieved on 22 July 2019. He also has a career high ATP doubles ranking of No. 129 achieved on 22 May 2023. Chung has won three doubles ATP Challenger titles as well as four ITF singles and five doubles titles.
On the junior tour, Chung had a career-high combined ranking of 3 achieved on 21 March 2016. Chung was a semifinalist at the 2016 Australian Open boys' singles event and the 2015 US Open boys' singles event where he fell to both eventual champions Oliver Anderson and Taylor Fritz, respectively. Chung was also a singles finalist at the Osaka Mayor's Cup in 2014.
He and Orlando Luz lost to Yishai Oliel of Israel and Patrik Rikl of the Czech Republic in the final of the 2016 French Open boys' doubles, 6–3, 6–4.