Ground: Hardcourt outdoor
| ITF M15 Anseong | 2022/08/17 03:10 | Colin Sinclair v Geun Jun Kim | 7-5,6-2 |
| ITF M25 Harmon | 2022/06/07 03:15 | Colin Sinclair v Geun Jun Kim | 6-7,3-6 |
| ITF M25 Burnie | 2025/02/19 02:00 | Chase Ferguson v Colin Sinclair | 7-6,6-3 |
| Challenger Manama | 2025/02/10 08:00 | Marat Sharipov v Colin Sinclair | 7-6,6-4 |
| Challenger Manama | 2025/02/09 09:00 | Colin Sinclair v Ryan Nijboer | 3-6,6-4,6-3 |
| Challenger Brisbane Qual | 2025/02/02 01:30 | Thomas Braithwaite v Colin Sinclair | 1-6,6-3,7-6 |
| Challenger Brisbane | 2025/01/27 00:00 | Kokoro Isomura v Colin Sinclair | 6-4,6-4 |
| Challenger Brisbane | 2025/01/26 03:10 | Duje Markovina v Colin Sinclair | 7-6,3-6,2-6 |
| Challenger Noumea | 2024/12/31 06:25 | Benoit Paire v Colin Sinclair | 6-7,6-1,7-5 |
| ITF M25 Carrara | 2024/11/27 00:00 | Moerani Bouzige v Colin Sinclair | 6-4,6-7,6-3 |
| ITF M15 Yanagawa | 2024/10/29 00:30 | Geun Jun Kim v Yuto Oki | 1-6,6-3,8-10 |
| ITF M15 Yanagawa | 2024/10/28 01:30 | Geun Jun Kim v Natsuki Yamamoto | 7-5,6-2 |
| ITF M15 Tanagura | 2024/10/21 00:30 | Ren Nakamura v Geun Jun Kim | 2-6,2-6 |
| ITF M15 Tanagura | 2024/10/20 00:30 | Yuttana Charoenphon v Geun Jun Kim | 3-6,2-6 |
| ITF M25 Changwon | 2024/06/19 04:50 | Naoki Nakagawa v Geun Jun Kim | 6-2,6-4 |
| ITF M25 Changwon | 2024/06/18 01:00 | Geun Jun Kim v Venedikt Tsirikidze | 6-3,6-3 |
| ITF M25 Changwon | 2024/06/17 00:55 | Geun Jun Kim v Jeong Heon Lee | 6-3,6-3 |
| ITF M25 Changwon | 2024/06/16 01:00 | Geun Jun Kim v Jungmin Hwang | 6-3,6-2 |