Challenger - Lexington 08/01 01:15 25 Yunseong Chung v William Bushamuka 6-2,6-3
Challenger - Binghamton 07/25 14:30 25 [225] Jay Clarke v Yunseong Chung [335] 6-1,7-6
Challenger - Gatineau 07/18 17:20 26 [143] Bradley Klahn v Yunseong Chung [354] 7-5,6-4
Challenger - Gatineau 07/17 20:55 25 [354] Yunseong Chung v Mitchell Krueger [216] 7-6,6-4
Challenger - Gatineau - Qualificação 07/16 16:30 54 Justin Boulais v Yunseong Chung 2-6,1-6
Challenger - Gatineau - Qualificação 07/15 18:50 46 [416] Alejandro Gomez v Yunseong Chung [369] 3-6,6-7
Challenger - Gatineau - Qualificação 07/14 17:50 45 Tyler Lu v Yunseong Chung 6-3,3-6,4-6
Challenger - Winnipeg 07/12 20:00 26 [369] Yunseong Chung v Go Soeda [178] 2-6,6-2,4-6
Challenger - Winnipeg 07/10 18:20 25 David Volfson v Yunseong Chung 3-6,3-6
Challenger - Winnipeg - Qualificação 07/09 16:40 54 Yunseong Chung v Jack Mingjie Lin 6-2,6-2
Challenger - Winnipeg - Qualificação 07/08 21:50 46 Yunseong Chung v Yshai Oliel 6-3,6-1
ITF - Coreia F3 06/24 05:00 29 Yunseong Chung v Ji Sung Nam 6-1,6-3
ITF - Coreia F3 06/23 02:00 28 [247] Soonwoo Kwon v Yunseong Chung [454] 4-6,4-6
ITF - Coreia F3 06/22 03:00 27 Yunseong Chung v Oh-Hee Kwon 6-4,6-1
ITF - Coreia F3 06/20 02:30 26 Yunseong Chung v Min-Kyu Song 7-6,7-6
ITF - Coreia F3 06/19 06:00 25 Yunseong Chung v Ju-Hae Moon 6-3,4-6,7-5
ITF - Coreia F2 06/17 04:00 29 Ji Sung Nam v Yunseong Chung 4-6,3-6
ITF - Coreia F2 06/16 02:40 28 Jae Hwan Kim v Yunseong Chung 4-6,7-5,2-6
ITF - Coreia F2 06/15 03:20 27 Chan-Yeong Oh v Yunseong Chung 6-7,6-3,4-6
ITF - Coreia F2 06/14 03:45 26 Soichiro Moritani v Yunseong Chung 6-7,0-6
ITF - Coreia 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 - Qualificação 05/14 02:00 54 [442] Yunseong Chung v Luke Saville [456] 6-7,7-6,6-0
Challenger - Busan - Qualificação 05/13 04:00 46 [161] Jason Kubler v Yunseong Chung [442] 3-6,2-6
Challenger - Busan - Qualificação 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 - Seul 05/01 06:00 25 [232] Lloyd Harris v Yunseong Chung [440] 5-7,6-3,6-0

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.