Stadium: Dusit Center Round: 25 Ground: Hardcourt outdoor
| Davis Cup | 2022/03/04 16:40 | Mark Lajal v Colin Sinclair | 7-5,7-5 |
| ITF M15 Oberhaching | 2022/02/15 11:00 | Colin Sinclair v Alexander Weis | 6-7,3-6 |
| ITF M15 Monastir | 2022/02/04 10:30 | Federico Iannaccone v Colin Sinclair | 2-6,6-4,7-5 |
| ITF M15 Monastir | 2022/02/03 08:00 | Masamichi Imamura v Colin Sinclair | 6-7,2-6 |
| ITF M15 Monastir | 2022/02/02 11:25 | Colin Sinclair v Jakub Paul | 6-3,6-3 |
| ITF M25 Monastir | 2022/01/26 15:55 | Yannick Mertens v Colin Sinclair | 6-4,6-4 |
| ITF M25 Monastir | 2022/01/24 12:00 | Colin Sinclair v Bharath Nishok Kumaran | 6-3,6-4 |
| ITF M25 Monastir | 2022/01/23 14:00 | Colin Sinclair v Jannik Maute | 6-3,6-1 |
| ITF M15 Monastir | 2021/06/27 08:00 | Omar Brigida v Geun Jun Kim | 6-3,6-1 |
| ITF M15 Monastir | 2021/06/21 09:00 | Alexander Kotzen v Geun Jun Kim | 6-0,6-2 |
| ITF M15 Monastir | 2021/06/20 10:30 | Geun Jun Kim v Ali Alshati | 6-2,6-0 |
| ITF M15 Monastir | 2021/06/13 12:30 | Omni Kumar v Geun Jun Kim | 6-1,6-0 |
| ITF M15 Monastir | 2021/06/06 10:00 | Ji Hoon Son v Geun Jun Kim | 6-2,7-5 |
| ITF M15 Changwon | 2019/10/16 00:45 | Geun Jun Kim v Sora Fukuda | 4-6,3-6 |
| ITF M15 Hua Hin | 2019/08/27 04:00 | Ti Chen v Geun Jun Kim | 4-6,7-5,10-2 |
| ITF M15 Anseong | 2019/06/26 01:00 | Yeongseok Jeong v Geun Jun Kim | 6-3,6-1 |