Hong Seong-chan

Hong Seong-chan (, born 30 June 1997) is a South Korean tennis player. Hong has a career high ATP singles ranking of world No. 139 achieved on 26 September 2024 and a doubles ranking of No. 359 achieved on 16 January 2023. He is the former Korean No. 1 singles player.

Since 2015, Hong has been a member of the South Korean Davis Cup team.

Career Juniors Hong reached the final of the 2015 Australian Open junior championships, falling to top seed Roman Safiullin in the final.

Hong had a career high junior ranking of No. 3.

2022: Maiden Challenger title He lifted his maiden trophy at the 2022 Matsuyama Challenger.

2023–2024: Masters debut, Three Challenger finals, top 150 He reached the last round of qualifying at the 2023 Rolex Shanghai Masters.

Ranked No. 227, he qualified for the 2024 BNP Paribas Open having entered the qualifying competition as an alternate after Yosuke Watanuki‘s withdrawal, making his Masters debut.

Ranked No. 175 he qualified for the ATP 500 Citi DC Open in Washington and defeated Adam Walton and upset third seed Karen Khachanov, for his first top 30 win.

Following semifinal showing at the 2024 International Challenger Zhangjiagang, he reached the top 150 at world No. 141 on 9 September 2024.

ATP Challenger and ITF Tour Finals

Singles: 23 (15–8) LegendATP Challenger Tour (1–3)ITF Futures/World Tennis Tour (14–5)Finals by surfaceHard (14–8)Clay (1–0)

Doubles (8–2) LegendGrand SlamATP Masters SeriesATP TourChallengersITF Futures (8–2)

Junior Grand Slam finals Singles: 1 (1 runner-up)