Aktobe, Singles Qualifying M-ITF-KAZ-02A 02/20 05:00 26 Ivanov, Vladimir v Yunseong Chung 3-6,6-2,7-6
Aktobe, Singles Qualifying M-ITF-KAZ-02A 02/19 07:15 25 Balzerani, Riccardo v Yunseong Chung 6-3,4-6,4-6
Aktobe, Singles Qualifying M-ITF-KAZ-02A 02/13 04:55 26 Otto Virtanen v Yunseong Chung 6-7,6-3,6-2
Aktobe, Singles Qualifying M-ITF-KAZ-02A 02/12 10:40 25 Shyla, Yaraslau v Yunseong Chung 6-7,6-7
Nonthaburi, Singles M-ITF-THA-01A 02/06 05:30 26 [389] Matija Pecotic v Yunseong Chung [326] 6-0,6-3
Nonthaburi, Singles M-ITF-THA-01A 02/05 09:45 25 [439] Calvin Hemery v Yunseong Chung [326] Retired
Bangkok, Thaïlande 01/12 06:40 24 [335] Jack Draper v Yunseong Chung [320] 7-6,6-3
Open d'Australie Playoff Wilcard Australienne 12/07 05:30 28 [321] Yunseong Chung v Tatsuma Ito [148] 6-1,4-6,4-6
Open d'Australie Playoff Wilcard Australienne 12/06 06:00 27 [270] Sasikumar Mukund v Yunseong Chung [321] 4-6,3-6
Open d'Australie Playoff Wilcard Australienne 12/04 04:00 26 [321] Yunseong Chung v Istomin, Denis [179] 7-5,6-3
Challenger Kobe 11/05 05:35 25 [297] Yunseong Chung v Sugita, Yuichi [107] 1-6,4-6
Challenger Kobe 11/04 04:00 24 [297] Yunseong Chung v Yusuke Takahashi [452] 7-6,7-6
Shenzhen II, Chine 10/29 02:00 24 [296] Yunseong Chung v Jonas Forejtek [332] 4-6,3-6
Liuzhou, Chine 10/23 02:00 25 [297] Yunseong Chung v Alejandro Davidovich Fokina [93] 5-7,5-7
Liuzhou, Chine 10/21 06:00 24 [297] Yunseong Chung v Niki, Takuto [481] 6-2,7-6
Ningbo, China 10/16 03:35 25 [281] Yunseong Chung v Petrovic, Danilo [195] 3-6,3-6
Ningbo, China 10/15 02:00 24 Yunseong Chung v Aoran Wang 1-6,6-2,6-1
Challenger Kaohsiung 09/17 01:30 24 Yunseong Chung v Niesten, Miliaan 4-6,3-6
Jinan, China 09/02 02:00 24 [263] Yunseong Chung v Kaichi Uchida [259] 2-6,4-6
US Open, New York, USA 08/20 16:20 44 [102] Salvatore Caruso v Yunseong Chung [259] 6-0,6-2
Challenger Yokkaichi 08/08 02:00 26 [269] Yunseong Chung v Myneni, Saketh [271] 3-6,6-3,3-6
Challenger Yokkaichi 08/06 07:20 25 Yunseong Chung v Alafia Ayeni 7-6,6-3
Chengdu, China 07/31 04:55 25 [237] Yunseong Chung v Kelly, Dayne [475] 3-6,6-4,2-6
Nur Sultan, Kazakhstan 07/19 06:45 27 [246] Yunseong Chung v Aleksandar Vukic [290] 3-6,2-6
Nur Sultan, Kazakhstan 07/18 05:00 26 [246] Yunseong Chung v Goncalo Oliveira [260] 6-7,7-5,6-4
Nur Sultan, Kazakhstan 07/17 05:00 25 [246] Yunseong Chung v Edan Leshem [398] 6-4,4-6,6-4
Challenger - Nottingham 06/11 18:40 24 Jack Draper v Yunseong Chung 5-7,6-0,6-2
Surbiton, Great Britain 06/05 13:15 25 [249] Yunseong Chung v Polansky, Peter [123] 3-6,3-6
Surbiton, Great Britain 06/04 10:00 24 Watson, Andrew v Yunseong Chung 2-6,2-6
Challenger - Gwangju 05/16 05:45 26 [253] Yunseong Chung v Evgeny Donskoy [150] 5-7,4-6

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.