ITF Korea F5 06/28 06:50 25 Yunseong Chung v Kim, A-Ram 6-1,6-2
ITF Korea F4 06/23 03:30 27 Yunseong Chung v Kim, Cheong-Eui 5-7,6-7
ITF Korea F4 06/22 04:05 26 Yunseong Chung v Oh, Seong-Gook 6-2,6-2
ITF Korea F4 06/20 04:15 25 Yunseong Chung v Lee, Dong-Kyu 6-3,6-2
ITF Korea F3 06/15 01:00 26 Yunseong Chung v Yoo, Daniel 5-7,4-6
ITF Korea F3 06/14 01:00 25 Yunseong Chung v Son, Ji Hoon 7-6,6-4
ITF Korea F2 06/08 01:00 26 Yunseong Chung v Son, Ji Hoon 6-7,6-0,6-7
ITF Korea F2 06/07 07:25 25 Yunseong Chung v Lee, Tae-Woo 6-2,6-7,6-1
ITF Korea F1 05/31 01:00 25 Kim, Seong Kwan v Yunseong Chung 5-7,6-3,6-4
Challenger Busan Qual 05/13 05:50 45 Yunseong Chung v Oh, Seong-Gook 6-4,6-7,3-6
Challenger Seoul 05/10 03:30 26 Yunseong Chung v Hiroki Moriya 6-4,6-7,3-6
Challenger Seoul 05/08 05:30 25 Lu, Yen-Hsun v Yunseong Chung 3-6,4-6
Challenger Gimcheon 05/01 04:25 25 Klein, Brydan v Yunseong Chung 6-3,6-4
Challenger Taipei Qual 04/16 06:50 46 Toshihide Matsui v Yun-Seong Chung 7-6,6-4
ITF Japan F1 03/07 02:35 25 Yunseong Chung v Huang, Liang-Chi 3-6,6-7
Yokohama, Japan, Qualifying 02/25 04:50 45 Yunseong Chung v Kwon, S. 6-7,5-7
Challenger Kyoto Qual 02/18 05:25 45 Yunseong Chung v Niki, Takuto 2-6,6-7
Thailande F6, Qualifications Simples 12/30 03:00 28 Dmitry Popko v Yunseong Chung 6-4,4-6,6-1
Thailande F6, Qualifications Simples 12/29 03:00 27 Yunseong Chung v Fajing Sun 4-6,7-5,6-2
Thailande F6, Qualifications Simples 12/28 03:00 26 Sabanin, Yan v Yunseong Chung 6-7,1-6
Thailande F6, Qualifications Simples 12/27 04:45 25 Yunseong Chung v Navasirisomboon, Jirat 7-6,6-4
ITF Thailand F5 12/19 03:00 25 Kim, Young Seok v Yunseong Chung 3-6,6-4,7-6
ITF Indonesia F5 12/07 05:25 25 Kim, Cheong-Eui v Yunseong Chung 6-2,5-7,7-5
Indonesia F4, Singles 11/30 04:45 25 Cing-Yang Meng v Yunseong Chung 7-6,6-4
Challenger Astana 2 11/23 05:00 26 Nikola Milojevic v Yunseong Chung 6-7,7-6,6-3
Challenger Astana 2 11/21 07:00 25 Ayap, Sagadat v Yunseong Chung 3-6,3-6
Challenger Astana 2 Qual 11/20 05:00 46 Kedriouk, Alexey v Yunseong Chung 4-6,1-6
Challenger Astana 2 Qual 11/19 05:00 45 Beibit Zhukayev v Yunseong Chung 3-6,2-6
Others 11/12 01:50 45 Kikuchi, Gengo v Yunseong Chung 7-5,6-4
ITF Chinese Taipei F3 10/27 04:00 26 Yu Hsiou Hsu v Yunseong Chung 6-3,7-6

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.