| ITF Korea F1 | 06/16 02:35 | 26 | Yunseong Chung v Jae-Min Seol | 4-6,6-4,4-6 | |
| ITF Korea F1 | 06/15 04:50 | 25 | Yunseong Chung v Jeamoon Lee | 6-1,6-3 | |
| ITF China F7 | 05/22 03:00 | 29 | Yunseong Chung v Akira Santillan | 1-6,4-6 | |
| ITF China F7 | 05/21 03:00 | 28 | Soonwoo Kwon v Yunseong Chung | 4-6,2-6 | |
| ITF China F7 | 05/20 07:35 | 27 | Finn Tearney v Yunseong Chung | 6-0,4-6,5-7 | |
| ITF China F7 | 05/19 03:30 | 26 | Yunseong Chung v Zhao Cai | 6-3,6-2 | |
| ITF China F7 | 05/18 02:00 | 25 | Bowen Ouyang v Yunseong Chung | 6-4,2-6,1-6 | |
| ITF Japan F4 | 03/30 01:00 | 25 | Yunseong Chung v Finn Tearney | 6-3,4-6,1-6 | |
| ITF Japan F3 | 03/23 04:15 | 26 | Yunseong Chung v Xin Gao | 4-6,0-6 | |
| ITF Japan F3 | 03/22 04:10 | 25 | Yunseong Chung v Bowen Ouyang | 6-3,6-4 | |
| ITF Japan F2 | 03/19 02:00 | 28 | Yunseong Chung v Yuya Kibi | 6-1,1-6,4-6 | |
| ITF Japan F2 | 03/18 01:30 | 27 | Yunseong Chung v Gengo Kikuchi | 2-6,6-4,6-1 | |
| ITF Japan F2 | 03/16 02:45 | 26 | Yunseong Chung v Hiroka Kondo | 6-1,7-5 | |
| ITF Japan F2 | 03/15 02:25 | 25 | Takuto Niki v Yunseong Chung | 3-6,6-3,3-6 | |
| ITF Japan F2 | 03/13 01:00 | 54 |
Yunseong Chung v
Tung-Lin Wu
|
7-6,6-2 | |
| ITF Turkey F7 | 02/19 09:35 | 27 |
Yunseong Chung v
Tallon Griekspoor
|
6-3,5-7,1-6 | |
| ITF Turkey F7 | 02/18 08:00 | 26 | Pedja Krstin v Yunseong Chung | 3-6,6-3,3-6 | |
| ITF Turkey F7 | 02/17 09:30 | 25 | Yunseong Chung v Muhammet Haylaz | 6-4,6-4 | |
| ITF Turkey F7 | 02/15 12:00 | 62 | Yunseong Chung v Pavel Krainik | 7-5,6-3 | |
| ITF Turkey F6 | 02/09 08:00 | 25 | Yunseong Chung v Lenny Hampel | 4-6,1-6 | |
| ITF Italy F11 | 05/25 11:10 | - | Jacopo Stefanini v Yunseong Chung | 6-3,6-4 | |
| ITF Italy F11 Qual | 05/24 08:30 | - | Yunseong Chung v Alessio Giannuzzi | 6-2,6-2 | |
| ITF Italy F11 Qual | 05/23 12:00 | - | Yunseong Chung v Uladzislau Zhuk | 6-2,6-1 | |
| ITF China F2 Qual | 04/17 02:00 | - | Yunseong Chung v Cheong-Eui Kim | 7-5,6-7,4-6 | |
| ITF China F2 Qual | 04/16 02:00 | - | Boy Westerhof v Yunseong Chung | Walkover | |
| ITF China F2 Qual | 04/14 02:00 | - | Xin Gao v Yunseong Chung | 6-3,4-6,3-6 | |
| ITF China F2 | 04/09 02:00 | - | Yunseong Chung v Tsung-Hua Yang | 3-6,2-6 | |
| ITF China F2 | 04/07 05:00 | - | Xin Gao v Yunseong Chung | 6-4,3-6,1-6 | |
| ITF Japan F2 | 03/16 02:25 | - | Yunseong Chung v Kento Takeuchi | 7-6,4-6,1-6 | |
| ITF Japan F1 | 03/12 02:45 | - | Yunseong Chung v Gengo Kikuchi | 6-1,6-7,5-7 |
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.