Stadium: Court 3 Round: 44 Ground: Hardcourt outdoor
| ITF M25 Tay Ninh Qual | 2019/10/06 06:30 | Ao Shen v Krittin Koaykul | 4-6,1-6 |
| ITF M25 Tay Ninh | 2019/10/02 04:25 | Manish Sureshkumar v Krittin Koaykul | 6-0,6-3 |
| ITF M25 Tay Ninh | 2019/10/01 03:35 | Kuan Yu Chen v Krittin Koaykul | 6-7,6-2,6-10 |
| ITF M25 Tay Ninh | 2019/09/30 06:00 | Quoc Uy Vo v Krittin Koaykul | 2-6,3-6 |
| ITF M15 Hua Hin | 2019/09/02 05:45 | Krittin Koaykul v Nitin Kumar Sinha | 3-6,2-6 |
| ITF M15 Hua Hin | 2019/08/19 05:15 | Krittin Koaykul v Kittirat Kerdlaphee | 6-4,1-6,15-13 |
| ITF M25 Nonthaburi | 2019/07/29 06:40 | Aaron Addison v Krittin Koaykul | 6-2,6-0 |
| ITF M25 Nonthaburi | 2019/07/23 03:45 | Daisuke Sumizawa v Krittin Koaykul | 6-4,1-6,11-9 |