Challenger Gwangju 04/18 02:00 26 [171] 하리스, 로이드 v 충, 윤성 [383] 6-4,6-4
Challenger Gwangju 04/16 03:15 25 [383] 충, 윤성 v 주브, 파울 [385] 6-4,4-6,6-3
Challenger Busan 04/09 05:30 25 [387] 충, 윤성 v Mark Lajal [211] 3-6,2-6
Challenger Busan 04/08 02:30 19 [331] 모리야, 히로키 v 충, 윤성 [388] 4-6,6-7
Challenger Busan 04/07 05:15 14 [430] 사켈라리디스, 스테파노스 v 충, 윤성 [388] 6-1,2-6,3-6
Tsukuba, Singles Qualifying M-ITF-JPN-04A 03/29 06:45 27 충, 윤성 v 시라이시, 히카루 6-2,4-6,4-6
Tsukuba, Singles Qualifying M-ITF-JPN-04A 03/28 01:30 26 충, 윤성 v 쿠마사카, 타쿠야 7-6,1-6,6-4
Tsukuba, Singles Qualifying M-ITF-JPN-04A 03/27 00:55 25 충, 윤성 v Yu Tanaka 6-3,7-6
Nishi-Tokyo, Singles M-ITF-JPN-02A 03/23 01:00 26 쿠마사카, 타쿠야 v 충, 윤성 Cancelled
Nishi-Tokyo, Singles M-ITF-JPN-02A 03/22 04:05 27 이, 덕희 v 충, 윤성 6-4,6-0
Nishi-Tokyo, Singles M-ITF-JPN-02A 03/21 00:55 26 시아우, 리앙 v 충, 윤성 2-6,4-6
Nishi-Tokyo, Singles M-ITF-JPN-02A 03/20 02:30 25 Imamura, Masamichi v 충, 윤성 6-7,2-6
Challenger New Delhi 02/25 11:45 14 비시와카르마, 시다르스 v 충, 윤성 Retired
Pune, India 02/19 05:30 19 자크하로브, 알렉세이 v 충, 윤성 6-3,5-7,6-4
Pune, India 02/18 08:15 14 [379] 충, 윤성 v 노구치, 리오 [334] 7-5,7-6
Challenger Bengaluru 02/12 06:20 19 [307] 트셍, 춘 흐신 v 충, 윤성 [381] 7-5,4-6,6-2
Challenger Bengaluru 02/11 09:30 14 칼리안풀, 아딜 v 충, 윤성 4-6,3-6
Challenger Nonthaburi 01/08 05:40 19 충, 윤성 v 랑모, 크리스티안 2-6,0-6
Challenger Nonthaburi 01/07 07:20 14 충, 윤성 v 콩카르, 콩섭 7-5,6-1
Challenger Nonthaburi 12/31 06:25 14 [372] 충, 윤성 v 우치다, 카이치 [307] 4-6,0-6
Challenger Yokohama 11/21 07:20 25 [357] 충, 윤성 v 나르디, 루카 [118] 2-6,4-6
Challenger Yokohama 11/20 03:35 19 [301] 우치야마, 야스타카 v 충, 윤성 [362] 6-4,6-7,7-6
Challenger Yokohama 11/19 05:25 14 [429] 순, 파징 v 충, 윤성 [362] 4-6,4-6
Challenger Kobe 11/16 02:00 26 [362] 충, 윤성 v 중, 제이슨 [242] Retired
Challenger Kobe 11/14 01:30 25 토쿠다, 렌타 v 충, 윤성 6-4,1-6,2-6
Challenger Kobe 11/13 01:30 19 [400] 노구치, 리오 v 충, 윤성 [362] 1-6,4-6
Challenger Kobe 11/12 02:25 14 신, 산후이 v 충, 윤성 3-6,3-6
Newport, USA 07/18 22:05 25 [322] 충, 윤성 v 존슨, 스테브 [197] 2-6,3-6
Newport, USA 07/17 19:45 19 [242] 주카예브, 베이비트 v 충, 윤성 [322] 4-6,3-6
Newport, USA 07/17 15:00 14 브리머, 개그 v 충, 윤성 3-6,6-7

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.