Stadium: Court 8 Round: 54 Ground: Hardcourt outdoor
| ITF M25 Nonthaburi | 2019/07/22 08:50 | Daisuke Sumizawa v Saranpong Borisutpong | 6-2,6-4 |
| ITF M25 Qujing | 2019/07/11 03:20 | Rio Noguchi v Daisuke Sumizawa | 6-3,6-0 |
| ITF M25 Qujing | 2019/07/09 04:30 | Zhuoyang Qiu v Daisuke Sumizawa | 1-6,0-6 |
| ITF M25 Kunshan | 2019/07/04 03:10 | Daisuke Sumizawa v Haitong Xia | 3-6,6-4,3-6 |
| ITF M25 Kunshan | 2019/07/02 10:35 | Pol Wattanakul v Daisuke Sumizawa | 1-6,6-2,3-6 |
| ITF M15 Anseong | 2019/06/25 02:45 | Uisung Park v Daisuke Sumizawa | 6-4,3-6,6-2 |
| ITF M15 Gimcheon | 2019/06/19 01:00 | Oh-Hee Kwon v Daisuke Sumizawa | 4-6,7-6,6-3 |
| ITF M15 Akishima | 2019/06/11 06:30 | Sho Shimabukuro v Daisuke Sumizawa | 6-4,6-3 |
| 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 |
| ITF M15 Anning | 2018/12/31 01:30 | Krittin Koaykul v Francesco Bessire | 3-6,2-6 |
| ITF Thailand F9 | 2018/11/10 05:00 | Krittin Koaykul v Chayanon Kaewsuto | 2-6,6-1,3-6 |
| ITF Thailand F8 | 2018/11/03 02:00 | Phongsapak Kerdlaphee v Krittin Koaykul | 6-2,6-4 |
| ITF Thailand F7 | 2018/10/28 03:00 | Krittin Koaykul v Siddharth Vishwakarma | 2-6,5-7 |