| 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 | |
| Challenger - Nonthaburi | 01/04 05:15 | 27 | Seongchan Hong v Marat Sharipov | 3-6,6-3,6-2 | |
| Challenger - Nonthaburi | 01/03 04:45 | 26 | [206] Mark Lajal v Seongchan Hong [273] | 6-2,4-6,5-7 | |
| Challenger - Nonthaburi | 01/02 05:55 | 25 | [273] Seongchan Hong v Pierre-Hugues Herbert [237] | 6-4,2-6,6-3 | |
| Challenger - Nonthaburi | 01/01 04:35 | 19 | [273] Seongchan Hong v Hady Habib [301] | 4-6,6-3,6-2 | |
| Challenger - Nonthaburi | 12/31 06:00 | 14 | [273] Seongchan Hong v Nick Hardt [373] | 1-6,6-1,6-3 | |
| Challenger - Yokkaichi | 11/27 03:45 | 25 | [272] Seongchan Hong v Omar Jasika [320] | 7-6,4-6,2-6 | |
| Challenger - Yokohama | 11/22 02:30 | 26 | [297] Yasutaka Uchiyama v Seongchan Hong [274] | 2-6,6-4,6-4 | |
| Challenger - Yokohama | 11/20 06:15 | 25 | [280] Seongchan Hong v Jurij Rodionov [107] | 7-6,7-6 | |
| Challenger - Kobe | 11/15 06:55 | 26 | [155] Sho Shimabukuro v Seongchan Hong [280] | 6-4,7-6 | |
| Challenger - Kobe | 11/13 05:10 | 25 | [319] Omar Jasika v Seongchan Hong [218] | 3-6,1-6 | |
| Challenger - Matsuyama | 11/07 02:45 | 25 | [218] Seongchan Hong v Luca Nardi [143] | 5-7,6-3,6-7 | |
| Challenger - Sydney | 10/30 23:00 | 25 | [422] Rio Noguchi v Seongchan Hong [215] | 6-2,6-2 | |
| Challenger - Playford | 10/27 00:30 | 27 | [223] Seongchan Hong v Rinky Hijikata [70] | 1-6,1-6 | |
| Challenger - Playford | 10/26 02:25 | 26 | [223] Seongchan Hong v Naoki Nakagawa [360] | 6-3,6-3 | |
| Challenger - Playford | 10/24 03:00 | 25 | Seongchan Hong v Jayden Court | 7-6,6-3 | |
| ATP - Xangai | 10/03 04:30 | 15 | [198] Seongchan Hong v Dane Sweeny [256] | 2-6,1-6 | |
| ATP - Xangai | 10/02 04:00 | 14 | [198] Seongchan Hong v Ergi Kirkin [328] | 7-5,6-3 | |
| Taça Davis | 09/17 12:45 | 1 | [75] Bernabe Zapata Miralles v Seongchan Hong [194] | 6-4,7-5 | |
| Taça Davis | 09/14 13:00 | 1 | [119] Tomas Machac v Seongchan Hong [194] | 7-6,4-6,6-2 | |
| Taça Davis | 09/12 13:00 | 1 | [52] Dusan Lajovic v Seongchan Hong [194] | 6-4,7-6 | |
| Challenger - Istambul | 09/04 07:00 | 19 | Seongchan Hong v Yshai Oliel | 4-6,1-6 | |
| Challenger - Istambul | 09/03 08:35 | 14 | Seongchan Hong v Cengiz Aksu | 6-2,6-4 | |
| Open dos EUA | 08/24 14:00 | 15 | [95] Taro Daniel v Seongchan Hong [203] | 6-2,4-6,6-1 | |
| Open dos EUA | 08/22 15:00 | 14 | [173] Francesco Passaro v Seongchan Hong [203] | 6-7,4-6 | |
| Challenger - Stanford | 08/14 05:00 | 25 | Alex Michelsen v Seongchan Hong | 4-6,6-2,6-0 |
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.