| ITF China F9 | 07/02 08:25 | 25 | Mcdaniels, Mitchell Thomas v Hong, Seong Chan | Retired | |
| ITF Korea F3 | 06/20 02:30 | 26 | Kwon, OH-Hee v Hong, Seong Chan | 7-5,6-4 | |
| ITF Korea F3 | 06/18 03:30 | 25 | Oh, Seong-Gook v Hong, Seong Chan | 6-7,0-6 | |
| ITF Korea F2 | 06/15 01:00 | 27 | Hong, Seong Chan v Nam, Ji Sung | 5-7,3-6 | |
| ITF Korea F2 | 06/14 02:45 | 26 | Hong, Seong Chan v Oh, Seong-Gook | Retired | |
| ITF Korea F2 | 06/13 01:00 | 25 | Hong, Seong Chan v Yoo, Daniel | Retired | |
| ITF Korea F1 | 06/06 01:00 | 25 | Jeong, Young-Hoon v Hong, Seong Chan | 1-6,6-3,6-2 | |
| Challenger - Busan | 05/15 06:30 | 25 | Hong, Seong Chan v Smith, John-Patrick | 2-6,4-6 | |
| Challenger Gimcheon Qual | 05/06 06:40 | 46 | Hong, Seong Chan v Tung-Lin Wu | 4-6,7-6,2-6 | |
| Challenger Gimcheon Qual | 05/05 04:20 | 45 | Hong, Seong Chan v Thomas Fancutt | 2-6,7-5,6-4 | |
| Challenger Seoul | 05/03 01:30 | 26 | Tatsuma Ito v Hong, Seong Chan | 7-5,6-1 | |
| Challenger Seoul | 04/30 06:40 | 25 | Yasutaka Uchiyama v Hong, Seong Chan | 6-2,4-6,5-7 | |
| ITF Japan F4 | 03/29 01:00 | 26 | Kuan-Yi Lee v Hong, Seong Chan | 6-1,3-6,6-4 | |
| ITF Japan F4 | 03/27 01:00 | 25 | Hong, Seong Chan v Gao, Xin | 6-3,6-4 | |
| ITF Japan F3 | 03/24 02:00 | 29 | Hong, Seong Chan v Makoto Ochi | 7-6,6-1 | |
| ITF Japan F3 | 03/23 02:00 | 28 | Tatsuma Ito v Hong, Seong Chan | 5-7,6-2,2-6 | |
| ITF Japan F3 | 03/22 07:05 | 27 | Song, Min-Kyu v Hong, Seong Chan | 5-7,6-7 | |
| ITF Japan F3 | 03/22 03:00 | 26 | Hong, Seong Chan v Shinji Hazawa | 7-6,6-3 | |
| ITF Japan F3 | 03/19 06:00 | 25 | Hong, Seong Chan v Naoki Tajima | 6-1,4-6,6-4 | |
| ITF Japan F2 | 03/16 03:35 | 27 | Kaichi Uchida v Hong, Seong Chan | 7-6,1-6,7-6 | |
| ITF Japan F2 | 03/15 01:00 | 26 | Tanaka, Yunosuke v Hong, Seong Chan | 3-6,3-6 | |
| ITF Japan F2 | 03/12 02:30 | 25 | Hong, Seong Chan v Sekiguchi, Shuichi | 6-4,1-6,7-6 | |
| Coupe Davis | 02/02 07:40 | 27 | Khan, Aqeel v Hong, Seong Chan | 4-6,7-5,7-5 | |
| Challenger - Gwangju | 09/19 06:35 | 25 | Hong, Seong Chan v Luke Saville | 6-2,4-6,6-7 | |
| ITF Korea F5 | 06/30 02:00 | 27 | Hong, Seong Chan v Kim, Young Seok | 6-7,4-6 | |
| ITF Korea F5 | 06/29 01:30 | 26 | Hong, Seong Chan v Na, Jung-Woong | 6-4,2-6,7-6 | |
| ITF Korea F5 | 06/28 01:00 | 25 | Hong, Seong Chan v Sin, Dong-Hak | 7-5,6-3 | |
| ITF Korea F5 | 06/27 01:30 | 62 | Hong, Seong Chan v Han, Seong Jae | 6-1,6-3 | |
| ITF Korea F5 | 06/26 01:30 | 62 | Hong, Seong Chan v Lee, Seounghun | 6-3,6-0 | |
| ITF Korea F3 | 06/13 02:00 | 25 | Kim, Young Seok v Hong, Seong Chan | 6-2,6-4 |
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.