Chung Yun-seong (Korean:정윤성; born 27 March 1998) is a South Koreantennis player.

Chung has a career highATP 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 doublesATP Challenger titles as well as fourITF 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 the2016 Australian Open boys' singles event and the2015 US Open boys' singles event where he fell to both eventual championsOliver Anderson andTaylor Fritz, respectively. Chung was also a singles finalist at theOsaka Mayor's Cup in 2014.

He andOrlando Luz lost toYishai Oliel of Israel andPatrik Rikl of the Czech Republic in the final of the2016 French Open boys' doubles, 6–3, 6–4.^[1]

Outcome	Year	Championship	Surface	Partner	Opponent	Score
Runner-up	2016	French Open	Clay	Orlando Luz	Yishai Oliel Patrik Rikl	3–6, 4–6

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Loss	0–1	Jun 2014	Korea F6,Gimcheon	Futures	Hard	Kim Cheong-Eui	2–6, 4–6
Loss	0–2	Aug 2015	Korea F3, Gimcheon	Futures	Hard	Jung-Woong Na	3–6, 1–6
Loss	0–3	May 2016	China F7,Wuhan	Futures	Hard	Akira Santillan	1–6, 4–6
Win	1–3	Jun 2018	Korea F2,Gyeongsan	Futures	Hard	Nam Ji-sung	6–4, 6–3
Win	2–3	Jun 2018	Korea F3,Daegu	Futures	Hard	Nam Ji-sung	6–1, 6–3
Win	3–3	May 2021	M15Monastir, Tunisia	World Tennis Tour	Hard	Aziz Dougaz	6–1, 7–5
Win	4–3	May 2021	M15 Monastir, Tunisia	World Tennis Tour	Hard	Jeremy Beale	6–4, 6–2
Loss	4–4	Jan 2022	M25 Monastir, Tunisia	World Tennis Tour	Hard	Harold Mayot	4–6, 6–0, 4–6

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Loss	0–1	Aug 2015	Astana, Kazakhstan	Challenger	Hard	Jurabek Karimov	Konstantin Kravchuk Denys Molchanov	2–6, 2–6
Win	1–1	Mar 2016	Japan F2, Tokyo	Futures	Hard	Soonwoo Kwon	Issei Okamura Kento Takeuchi	2–6, 6–2, [10–3]
Loss	1–2	Jun 2016	Korea F2,Sangju	Futures	Hard	Lim Yong-kyu	Nam Ji-sung Song Min-kyu	4–6, 4–6
Loss	1–3	Aug 2016	Thailand F1,Hua Hin	Futures	Hard	Xin Gao	Chen Ti John Paul Fruttero	2–6, 2–6
Win	2–3	Oct 2016	Chinese Taipei F2,Kaohsiung	Futures	Hard	Patrik Niklas-Salminen	Yu Hsiang Chiu Shao-Fan Liu	7–5, 6–4
Win	3–3	Dec 2016	Indonesia F4,Jakarta	Futures	Hard	Shintaro Imai	Julien Cagnina Enzo Couacaud	6–2, 6–4
Win	4–3	Dec 2016	Indonesia F5, Jakarta	Futures	Hard	Shintaro Imai	Issei Okamura Kento Takeuchi	6–2, 3–6, [10–6]
Win	5–3	Feb 2018	Spain F3,Mallorca	Futures	Clay	Rio Noguchi	Bruno Sant'Anna David Vega Hernández	2–6, 7–6(8–6), [10–8]
Win	6–3	Jun 2018	Korea F3,Daegu	Futures	Hard	Seong Chan Hong	Soonwoo Kwon Lim Yong-kyu	walkover
Loss	6–4	Jul 2019	Astana, Kazakhstan	Challenger	Hard	Nam Ji-sung	Andrey Golubev Aleksandr Nedovyesov	4–6, 4–6
Loss	6–5	Feb 2020	M25Nonthaburi, Thailand	World Tennis Tour	Hard	Corentin Denolly	Sonchat Ratiwatana Sanchai Ratiwatana	6–3, 4–6, [5–10]
Win	7–5	Feb 2020	M25Aktobe, Kazakhstan	World Tennis Tour	Hard	Aldin Šetkić	Riccardo Balzerani Francesco Forti	6–3, 6–4
Loss	7–6	Feb 2021	M15Antalya, Turkey	World Tennis Tour	Clay	Oleksandr Ovcharenko	Max Houkes Sidane Pontjodikromo	5–7, 1–6
Win	8–6	May 2021	M15Monastir, Tunisia	World Tennis Tour	Hard	Shintaro Imai	Filip Bergevi Jonathan Mridha	6–2, 7–6(7–4)
Win	9–6	May 2021	M15 Monastir, Tunisia	World Tennis Tour	Hard	Shintaro Imai	Aziz Dougaz Benjamin Lock	6–3, 6–2
Loss	9–7	Jul 2021	M25Champaign, United States	World Tennis Tour	Hard	Rio Noguchi	Ben Shelton Eliot Spizzirri	4–6, 0–6
Win	10–7	Jun 2022	Orlando, USA	Challenger	Hard	Michail Pervolarakis	Malek Jaziri Kaichi Uchida	6–7(5–7), 7–6(7–3), [16–14]
Win	11–7	Sep 2022	Nonthaburi, Thailand	Challenger	Hard	Ajeet Rai	Francis Casey Alcantara Christopher Rungkat	6–1, 7–6(8–6)
Loss	11–8	Oct 2022	Seoul, South Korea	Challenger	Hard	Aleksandar Kovacevic	Kaichi Uchida Wu Tung-lin	7–6(7–2), 5–7, [9–11]
Loss	11–9	Jan 2023	Tigre, Argentina	Challenger	Clay	Christian Langmo	Daniel Dutra da Silva Oleg Prihodko	2–6, 2–6
Win	12–9	Feb 2023	Bangalore, India	Challenger	Hard	Hsu Yu-hsiou	Anirudh Chandrasekar Vijay Sundar Prashanth	3–6, 7–6(9–7), [11–9]
Loss	12–10	Apr 2023	M25Kashiwa, Japan	World Tennis Tour	Hard	Shintaro Imai	Hsu Yu-hsiou Huang Tsung-hao	6–7(5–7), 6–2, [10–12]
Win	13–10	Apr 2023	M25Jakarta, Indonesia	World Tennis Tour	Hard	Jeong Yeong-Seok	Makoto Ochi Yuta Shimizu	4–6, 7–6(7–1), [10–8]
Loss	13–11	Apr 2023	Seoul, South Korea	Challenger	Hard	Yuta Shimizu	Max Purcell Yasutaka Uchiyama	1–6, 4–6
Win	14–11	Jun 2023	M25Anseong, South Korea	World Tennis Tour	Hard	Takeru Yuzuki	Shunsuke Mitsui Naoki Tajima	7–6(7–3), 6–4

• Chung Yun-seong at theAssociation of Tennis Professionals
• Chung Yun-seong at theInternational Tennis Federation

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