| ITF M15 Nakhon Pathom Qual | 2025/07/20 04:00 | Vishnu Vardhan v Krittin Koaykul | 6-2,3-6,1-0 |
| ITF M15 Nakhon Pathom | 2025/07/15 05:00 | Chase Ferguson v Krittin Koaykul | 6-2,6-3 |
| ITF M15 Nakhon Pathom | 2025/07/14 03:30 | Ofek Shimanov v Krittin Koaykul | 6-0,6-1 |
| ITF M15 Nakhon Pathom | 2025/07/13 07:23 | Casey Ambler v Krittin Koaykul | 6-3,3-6,0-1 |
| ITF M15 Nonthaburi | 2025/03/26 03:00 | Krittin Koaykul v Uisung Park | 2-6,1-6 |
| ITF M15 Nonthaburi Qual | 2025/03/16 06:00 | Daniel Khazime v Krittin Koaykul | 6-0,6-1 |
| ITF M15 Nonthaburi | 2025/03/09 04:30 | Giorgio Tabacco v Krittin Koaykul | 6-1,6-1 |
| ITF M25 Nakhon Si Thammarat | 2024/09/02 04:40 | Krittin Koaykul v Minghui Zhang | 4-6,4-6 |