| Challenger Gwangju | 04/18 03:30 | 26 | [172] Seongchan Hong v Sho Shimabukuro [173] | 4-6,4-6 | |
| Challenger Gwangju | 04/16 05:10 | 25 | [239] Illya Marchenko v Seongchan Hong [172] | 3-6,2-6 | |
| Challenger - Busan | 04/14 03:15 | 29 | Yasutaka Uchiyama v Seongchan Hong | 7-6,6-3 | |
| Challenger - Busan | 04/13 04:50 | 28 | Soonwoo Kwon v Seongchan Hong | Walkover | |
| Challenger - Busan | 04/12 05:05 | 27 | [194] Coleman Wong v Seongchan Hong [201] | 4-6,6-3,2-6 | |
| Challenger - Busan | 04/11 03:55 | 26 | [211] Mark Lajal v Seongchan Hong [201] | 4-6,4-6 | |
| Challenger - Busan | 04/09 04:10 | 25 | [201] Seongchan Hong v Otto Virtanen [159] | 6-2,6-2 | |
| Challenger - Phoenix | 03/11 19:30 | 14 | [112] David Goffin v Seongchan Hong [227] | 6-2,6-4 | |
| ATP - Indian Wells | 03/07 22:15 | 23 | [81] Jakub Mensik v Seongchan Hong [227] | 6-3,6-4 | |
| ATP - Indian Wells | 03/05 18:00 | 15 | [101] Sumit Nagal v Seongchan Hong [227] | 6-2,2-6,6-7 | |
| ATP - Indian Wells | 03/04 18:00 | 14 | Soonwoo Kwon v Seongchan Hong | 3-6,3-6 | |
| Challenger - Nova Deli | 02/27 05:45 | 25 | [221] Seongchan Hong v Tristan Boyer [255] | 3-6,7-6,6-7 | |
| Challenger - Pune | 02/20 05:45 | 25 | [221] Seongchan Hong v Maks Kasnikowski [267] | 4-6,2-6 | |
| Challenger -Bengaluru | 02/18 12:30 | 29 | [221] Seongchan Hong v Stefano Napolitano [204] | 6-4,3-6,3-6 | |
| Challenger -Bengaluru | 02/17 10:00 | 28 | [221] Seongchan Hong v Oriol Roca Batalla [209] | 6-2,3-6,6-3 | |
| Challenger -Bengaluru | 02/16 08:30 | 27 | [462] Ramkumar Ramanathan v Seongchan Hong [221] | 5-7,7-5,4-6 | |
| Challenger -Bengaluru | 02/14 08:50 | 26 | Alexey Zakharov v Seongchan Hong | 4-6,5-7 | |
| Challenger -Bengaluru | 02/13 07:30 | 25 | [243] Tristan Schoolkate v Seongchan Hong [221] | 4-6,3-6 | |
| Challenger -Bengaluru | 02/12 04:30 | 25 | Seong Chan Hong v Vasek Pospisil | Cancelled | |
| Taça Davis | 02/03 21:40 | 168 | [132] Gabriel Diallo v Seongchan Hong [224] | 7-5,4-6,6-1 | |
| Taça Davis | 02/02 23:05 | 168 | [486] Vasek Pospisil v Seongchan Hong [224] | 6-4,6-3 | |
| Challenger - Nonthaburi | 01/21 03:30 | 29 | [171] Matteo Gigante v Seongchan Hong [247] | 6-4,6-1 | |
| Challenger - Nonthaburi | 01/20 03:30 | 28 | [279] Giovanni Fonio v Seongchan Hong [247] | 4-6,1-6 | |
| Challenger - Nonthaburi | 01/19 03:30 | 27 | [213] Dennis Novak v Seongchan Hong [247] | Retired | |
| Challenger - Nonthaburi | 01/17 07:10 | 26 | [247] Seongchan Hong v Benjamin Hassan [149] | 6-2,6-3 | |
| Challenger - Nonthaburi | 01/16 04:15 | 25 | [247] Seongchan Hong v Oriol Roca Batalla [210] | 3-6,7-6,6-3 | |
| Challenger - Nonthaburi | 01/15 05:55 | 19 | [247] Seongchan Hong v Salvatore Caruso [289] | 6-2,6-7,6-2 | |
| Challenger - Nonthaburi | 01/14 06:55 | 14 | Seongchan Hong v Siwanat Auytayakul | 7-6,6-1 | |
| Challenger - Nonthaburi | 01/09 03:00 | 25 | [253] Brandon Holt v Seongchan Hong [248] | 6-2,6-2 | |
| Challenger - Nonthaburi | 01/05 04:00 | 28 | [329] Lucas Pouille v Seongchan Hong [273] | 6-3,6-3 |
Wikipedia - Hong Seong-chan
Hong Seong-chan (em coreano: 홍성찬; nascido em 30 de junho de 1997 em Gangwon-do) é um tenista sul-coreano.