| ITF Korea F2 | 06/08 01:00 | 26 | Oh-Hee Kwon v Seong Chan Hong | Retired | |
| ITF Korea F2 | 06/07 06:55 | 25 | Ju-Hae Moon v Seong Chan Hong | 3-6,3-6 | |
| ITF Korea F1 | 06/04 03:30 | 29 | Daniel Nguyen v Seong Chan Hong | 6-4,5-7,6-2 | |
| ITF Korea F1 | 06/03 03:05 | 28 | Seong Chan Hong v Makoto Ochi | 6-1,7-6 | |
| ITF Korea F1 | 06/02 01:00 | 27 | Sang-Woo Noh v Seong Chan Hong | 4-6,2-6 | |
| ITF Korea F1 | 06/01 03:05 | 26 | Jae-Won Choi v Seong Chan Hong | 3-6,2-6 | |
| ITF Korea F1 | 05/31 01:00 | 25 | Dong-Kyu Lee v Seong Chan Hong | 1-6,6-4,4-6 | |
| Challenger Busan | 05/16 03:25 | 25 | Seong Chan Hong v Go Soeda | 6-2,3-6,1-6 | |
| Challenger Seoul | 05/10 01:30 | 25 | Austin Krajicek v Seong Chan Hong | 7-6,6-3 | |
| Challenger Gimcheon | 05/02 03:25 | 25 | Seong Chan Hong v Yuki Bhambri | 3-6,6-3,4-6 | |
| Davis Cup | 04/09 01:35 | 28 | Michael Venus v Seong Chan Hong | 6-3,3-6,4-6,6-2,6-3 | |
| Davis Cup | 04/07 00:30 | 28 | Jose Statham v Seong Chan Hong | Retired | |
| ITF Japan F4 | 04/01 01:00 | 28 | Seong Chan Hong v Yusuke Takahashi | 4-6,5-7 | |
| ITF Japan F4 | 03/31 02:30 | 27 | Seong Chan Hong v Yosuke Watanuki | 7-5,6-4 | |
| ITF Japan F4 | 03/30 01:00 | 26 | Seong Chan Hong v Gengo Kikuchi | 6-3,6-3 | |
| ITF Japan F4 | 03/28 03:00 | 25 | Seong Chan Hong v Yuta Shimizu | 6-2,7-6 | |
| ITF Turkey F8 | 02/27 07:00 | 25 | Sarp Agabigun v Seong Chan Hong | 1-6,7-6,7-5 | |
| ITF Turkey F7 | 02/24 10:20 | 27 | Cem Ilkel v Seong Chan Hong | 6-7,6-4,7-5 | |
| ITF Turkey F7 | 02/23 10:05 | 26 | Martins Podzus v Seong Chan Hong | 2-6,5-7 | |
| ITF Turkey F7 | 02/21 10:35 | 25 | Maksim Tikhomirov v Seong Chan Hong | 1-6,3-6 | |
| ITF Turkey F6 | 02/16 08:00 | 26 | Seong Chan Hong v Felipe Mantilla | 2-6,3-6 | |
| ITF Turkey F6 | 02/14 08:30 | 25 | Seong Chan Hong v Ivan Davydov | 6-3,6-0 | |
| Challenger Bangkok 2 Qual | 01/09 04:30 | 54 | Seong Chan Hong v Jimmy Wang | 6-2,4-6,4-6 | |
| Challenger Bangkok 2 Qual | 01/08 09:20 | 46 | Seong Chan Hong v Sidharth Rawat | 6-4,6-0 | |
| Challenger Bangkok Qual | 01/01 04:00 | 46 | Seong Chan Hong v Jurgen Zopp | 4-6,7-6,5-7 | |
| Challenger Bangkok Qual | 12/31 04:55 | 45 | Ti Chen v Seong Chan Hong | 2-6,7-6,3-6 | |
| Challenger Toyota | 11/15 05:30 | 25 | Yoshihito Nishioka v Seong Chan Hong | 6-3,6-3 | |
| Challenger Kobe | 11/07 04:00 | 25 | Hyeon Chung v Seong Chan Hong | 6-1,6-3 | |
| ITF Vietnam F5 | 09/19 03:00 | 25 | Seong Chan Hong v Soichiro Moritani | 7-6,4-6,4-6 | |
| ITF Vietnam F4 | 09/13 09:35 | 25 | Joel Cannell v Seong Chan Hong | Retired |
Wikipedia - 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. 172 achieved on 15 April 2024 and a doubles ranking of No. 359 achieved on 16 January 2023. He is the current Korean No. 1 singles player.
Since 2015, Hong has been a member of the South Korean Davis Cup team.
History
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 ATP Challenger title
He lifted his maiden trophy at the ATP 2022 Matsuyama Challenger.
2023-2024: Masters debut, Three Challenger finals
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.