ITF Korea F2 06/14 03:45 26 Soichiro Moritani v Yunseong Chung 6-7,0-6
ITF Korea F2 06/12 01:00 25 Clement Larriere v Yunseong Chung 3-6,4-6
ITF China F7 06/01 06:15 27 [221] Xin Gao v Yunseong Chung [450] 6-0,6-7,6-3
ITF China F7 05/31 04:30 26 Chien Hsun Lo v Yunseong Chung 2-6,7-5,5-7
ITF China F7 05/29 05:30 25 Zhenxiong Dong v Yunseong Chung 2-6,1-6
Challenger Busan 05/15 03:25 25 [85] Matthew Ebden v Yunseong Chung [464] 6-3,3-6,6-3
Challenger Busan Qual 05/14 02:00 54 [442] Yunseong Chung v Luke Saville [456] 6-7,7-6,6-0
Challenger Busan Qual 05/13 04:00 46 [161] Jason Kubler v Yunseong Chung [442] 3-6,2-6
Challenger Busan Qual 05/12 02:55 45 Yunseong Chung v Ben Patael 6-3,6-2
Challenger Gimcheon 05/08 04:05 25 [89] Jordan Thompson v Yunseong Chung [442] 6-4,6-1
Challenger Seoul 05/01 06:00 25 [232] Lloyd Harris v Yunseong Chung [440] 5-7,6-3,6-0
Challenger Anning 04/26 03:00 26 [486] Yunseong Chung v Jordan Thompson [98] 3-6,4-6
Challenger Anning 04/24 09:20 25 [277] Di Wu v Yunseong Chung [486] 6-7,3-6
Challenger Anning Qual 04/22 04:50 - Hugo Grenier v Yunseong Chung Retired
Challenger Anning Qual 04/21 05:00 25 Chu-Huan Yi v Yunseong Chung 2-6,6-7
Challenger Nanchang 04/19 04:30 26 Aleksandr Nedovyesov v Yunseong Chung 6-4,6-2
Challenger Nanchang 04/17 03:00 25 Yunseong Chung v Tatsuma Ito 6-4,7-6
Challenger Nanchang Qual 04/15 05:25 46 Sasi Kumar Mukund v Yunseong Chung 2-6,4-6
Challenger Nanchang Qual 04/14 04:40 45 Hao Wu v Yunseong Chung 3-6,1-6
Challenger Taipei Qual 04/07 02:00 45 Jacob Grills v Yunseong Chung 6-3,2-6,6-2
Challenger Qujing 03/20 04:45 25 Malek Jaziri v Yunseong Chung 6-2,6-4
Challenger Qujing Qual 03/18 05:45 46 Yunseong Chung v Mikhail Elgin 6-3,6-7,6-3
Challenger Qujing Qual 03/17 02:00 45 Yunseong Chung v Toshihide Matsui Retired
Challenger Shenzhen Qual 03/11 06:00 46 Yunseong Chung v Gianluigi Quinzi 6-7,6-3,5-7
Challenger Shenzhen Qual 03/11 01:30 45 Chuhan Wang v Yunseong Chung Retired
Challenger Zhuhai Qual 03/04 08:35 46 Alex Bolt v Yunseong Chung 6-4,6-2
Challenger Zhuhai Qual 03/03 06:50 45 Yunseong Chung v Andrea Vavassori 6-3,4-6,6-3
Challenger Yokohama 02/27 02:25 25 Yunseong Chung v Jason Jung 2-6,7-6,4-6
Challenger Yokohama Qual 02/26 04:05 54 Makoto Ochi v Yunseong Chung 3-6,6-1,1-6
Challenger Yokohama Qual 02/25 02:35 46 Yunseong Chung v Takuto Niki 6-7,6-3,6-3

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.