Chung Yun-seong

Chung Yun-seong (; 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 and 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.

Junior Grand Slam finals

Doubles: 1 (1 runner-up) OutcomeYearChampionshipSurfacePartnerOpponentScoreRunner-up 2016 French Open Clay Orlando Luz Yishai Oliel Patrik Rikl 3–6, 4–6

ATP Challenger and ITF Futures/World Tennis Tour finals Singles: 8 (4–4) LegendATP Challenger (0–0)ITF Futures (4–4)Finals by surfaceHard (4–4)Clay (0–0)

Doubles: 25 (14 titles, 11 runner-ups) LegendATP Challenger (3–5)ITF Futures (11–6)Finals by surfaceHard (13–9)Clay (1–2)