ITF Spain F1 01/15 10:30 25 Yunseong Chung v Meis, Pascal 6-0,6-2
ITF Thailand F11 12/05 08:00 25 Wishaya Trongcharoenchaikul v Yunseong Chung 3-6,7-5,7-6
ITF Thailand F11 12/05 04:30 - Trongcharoenchaikul, Wishaya v Yunseong Chung 3-6,7-5,7-6
ITF Thailand F10 11/29 03:00 26 Podzus, Martins v Yunseong Chung 6-2,6-3
ITF Thailand F10 11/28 03:00 25 Pruchya Isaro v Yunseong Chung 7-5,5-7,2-6
Challenger Hua Hin Qual 11/19 04:00 46 Wattanakul, Pol v Yunseong Chung 7-5,6-4
Challenger Hua Hin Qual 11/18 06:30 45 Kerdlaphee, Kittirat v Yunseong Chung 1-6,2-6
Challenger Kobe Qual 11/04 02:00 45 Yunseong Chung v James Trotter 6-7,6-3,5-7
Challenger Shenzhen 2 Qual 10/28 07:35 46 Yang, Tsung-Hua v Yunseong Chung 6-3,6-2
Ningbo, China 10/20 02:00 26 Yunseong Chung v Jurij Rodionov Walkover
Ningbo, China 10/17 04:20 25 Nicolas Jarry v Yunseong Chung 6-7,3-6
Ningbo, China, Qualifying 10/16 03:15 54 Yunseong Chung v Vishnu Vardhan 7-6,6-2
Ningbo, China, Qualifying 10/15 07:50 46 Sekiguchi, Shuichi v Yunseong Chung 4-6,3-6
Ningbo, China, Qualifying 10/14 06:10 45 Ruikai Wang v Yunseong Chung 2-6,2-6
ITF Thailand F8 10/12 03:00 27 Yunseong Chung v Barry, Sam 2-6,4-6
ITF Thailand F8 10/11 04:55 26 Tung-Lin Wu v Yunseong Chung 5-7,2-6
ITF Thailand F8 10/10 05:00 25 Yunseong Chung v Navasirisomboon, Jirat 6-1,6-2
Challenger Kaohsiung 10/04 09:40 25 Yang, Tsung-Hua v Yunseong Chung 6-3,6-2
Challenger Gwangju Qual 09/17 01:30 46 Yang, Tsung-Hua v Yunseong Chung 7-6,7-5
Challenger Gwangju Qual 09/16 01:30 45 Yunseong Chung v Im, Seong Taek 6-1,7-6
Challenger Shanghai Qual 09/10 02:00 46 Yang, Tsung-Hua v Yunseong Chung Retired
Challenger Shanghai Qual 09/09 02:00 45 Yunseong Chung v Zhu, Zhicheng 6-3,6-1
Chengdu, China 08/03 03:00 26 Yunseong Chung v Nikola Milojevic 6-7,4-6
Chengdu, China 08/01 02:00 25 Yunseong Chung v Sekiguchi, Shuichi 4-6,6-3,7-5
Challenger Chengdu Qual 07/30 03:00 54 Vishnu Vardhan v Yunseong Chung 4-6,3-6
Challenger Chengdu Qual 07/29 03:55 46 Betov, Sergey v Yunseong Chung 2-6,6-7
ITF China F14 07/25 03:35 25 Yunseong Chung v Jie Cui 3-6,5-7
ITF China F13 07/20 02:00 26 Hung, Jui-Chen v Yunseong Chung 1-6,6-3,6-4
ITF China F13 07/18 05:35 25 Feng, He v Yunseong Chung 4-6,4-6
ITF Korea F5 06/29 01:30 26 Yunseong Chung v Lee, Tae-Woo 5-7,6-7

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.