Estádio: Centre Court Round: 44 Ground: Hardcourt outdoor
| ITF - M25 Tay Ninh | 2019/09/29 06:30 | Ha Minh Duc Vu v Quoc Uy Vo | 6-7,2-6 |
| 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 |
| ITF - M25 Nonthaburi | 2019/07/22 09:35 | Krittin Koaykul v Mehluli D A Sibanda | 6-4,6-4 |
| ITF - M25 Nonthaburi | 2019/05/28 05:50 | Rio Noguchi v Krittin Koaykul | 6-3,6-0 |
| ITF - M25 Nonthaburi | 2019/05/20 06:55 | Alexander Crnokrak v Krittin Koaykul | 6-1,6-4 |
| ITF - M15 Anning | 2019/01/14 01:30 | Kazuma Kawachi v Krittin Koaykul | 7-6,6-2 |