ITF Korea F5 06/28 06:50 25 Yunseong Chung v A-Ram Kim 6-1,6-2
ITF Korea F4 06/23 03:30 27 Yunseong Chung v Cheong-Eui Kim 5-7,6-7
ITF Korea F4 06/22 04:05 26 Yunseong Chung v Seong-Gook Oh 6-2,6-2
ITF Korea F4 06/20 04:15 25 Yunseong Chung v Dong-Kyu Lee 6-3,6-2
ITF Korea F3 06/15 01:00 26 Yunseong Chung v Daniel Yoo 5-7,4-6
ITF Korea F3 06/14 01:00 25 Yunseong Chung v Ji Hoon Son 7-6,6-4
ITF Korea F2 06/08 01:00 26 Yunseong Chung v Ji Hoon Son 6-7,6-0,6-7
ITF Korea F2 06/07 07:25 25 Yunseong Chung v Tae-Woo Lee 6-2,6-7,6-1
ITF Korea F1 05/31 01:00 25 Dylan Seong Kwan Kim v Yunseong Chung 5-7,6-3,6-4
Challenger Busan Qual 05/13 05:50 45 Yunseong Chung v Seong-Gook Oh 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 Yen-Hsun Lu v Yunseong Chung 3-6,4-6
Challenger Gimcheon 05/01 04:25 25 Brydan Klein 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 Liang-Chi Huang 3-6,6-7
Challenger Yokohama Qual 02/25 04:50 45 Yunseong Chung v Soon Woo Kwon 6-7,5-7
Challenger Kyoto Qual 02/18 05:25 45 Yunseong Chung v Takuto Niki 2-6,6-7
ITF Thailand F6 12/30 03:00 28 Dmitry Popko v Yunseong Chung 6-4,4-6,6-1
ITF Thailand F6 12/29 03:00 27 Yunseong Chung v Fajing Sun 4-6,7-5,6-2
ITF Thailand F6 12/28 03:00 26 Yan Sabanin v Yunseong Chung 6-7,1-6
ITF Thailand F6 12/27 04:45 25 Yunseong Chung v Jirat Navasirisomboon 7-6,6-4
ITF Thailand F5 12/19 03:00 25 Young Seok Kim v Yunseong Chung 3-6,6-4,7-6
ITF Indonesia F5 12/07 05:25 25 Cheong-Eui Kim v Yunseong Chung 6-2,5-7,7-5
ITF Indonesia F4 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 Sagadat Ayap v Yunseong Chung 3-6,3-6
Challenger Astana 2 Qual 11/20 05:00 46 Alexey Kedryuk 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 Gengo Kikuchi 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.