| 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 | |
| Challenger Noumea | 01/01 04:25 | 25 |
[274] Yunseong Chung v
Jurij Rodionov
[217] 
|
4-6,1-6 | |
| Challenger Noumea | 12/31 00:30 | 24 | [262] Yunseong Chung v Tomislav Brkic [309] | 6-3,6-2 | |
| ITF Qatar F5 | 12/11 12:00 | 25 | Yunseong Chung v Kristian Lozan | Cancelled | |
| Australian Open WC | 11/30 05:45 | 27 | Zhe Li v Yunseong Chung | 6-4,6-4 | |
| Australian Open WC | 11/29 03:50 | 26 |
[402] Rigele Te
v
Yunseong Chung [266] |
6-7,1-6 | |
| Challenger Kobe | 11/16 04:45 | 27 | [281] Yunseong Chung v Tatsuma Ito [163] | 2-6,3-6 | |
| Challenger Kobe | 11/14 05:00 | 26 | [385] Nam Hoang Ly v Yunseong Chung [281] | 4-6,2-6 | |
| Challenger Kobe | 11/13 02:00 | 25 |
[281] Yunseong Chung v
Jelle Sels
[266] 
|
7-6,7-6 | |
| Challenger Liuzhou | 10/23 03:35 | 25 |
[149] Miomir Kecmanovic
v
Yunseong Chung [282] |
Retired | |
| Challenger Liuzhou | 10/22 04:45 | 54 | [282] Yunseong Chung v Emil Ruusuvuori [318] | 6-3,6-3 | |
| Challenger Liuzhou | 10/21 07:00 | 46 | Yunseong Chung v Youssef Hossam | 7-5,6-3 | |
| Challenger Liuzhou | 10/20 08:20 | 45 | Yunseong Chung v Sidharth Rawat | 5-7,6-2,6-3 | |
| Challenger Ningbo | 10/19 03:00 | 27 | [291] Yunseong Chung v Prajnesh Gunneswaran [170] | 2-6,1-6 | |
| Challenger Ningbo | 10/17 05:15 | 26 |
[291] Yunseong Chung v
Yosuke Watanuki
[220] 
|
2-6,7-6,6-3 | |
| Challenger Ningbo | 10/15 04:05 | 25 |
[127] Ramkumar Ramanathan
v
Yunseong Chung [294] |
6-1,6-7,6-7 | |
| Challenger Tashkent | 10/07 05:00 | 46 | Yunseong Chung v Artem Dubrivnyy | 3-6,5-7 | |
| Challenger Tashkent | 10/06 05:00 | 45 | Yunseong Chung v Grigoriy Korobeynikov | 6-0,6-0 | |
| Challenger Kaohsiung | 09/18 10:00 | 25 | [123] Jason Jung v Yunseong Chung [296] | 6-3,6-4 |
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.