Stadium: Court 8 Round: 44 Ground: Hardcourt outdoor
| ITF Thailand F6 | 2018/10/08 02:30 | Natthasith Kunsuwan v Daisuke Sumizawa | 2-6,2-6 |
| ITF M25 Nonthaburi | 2019/07/30 04:50 | Noppadol Noikor v Natthasith Kunsuwan | 6-4,6-4 |
| ITF M25 Nonthaburi | 2019/07/29 04:00 | Natthasith Kunsuwan v Congsup Congcar | 6-4,7-6 |
| ITF M25 Nonthaburi | 2019/07/22 02:30 | Dusty H. Boyer v Natthasith Kunsuwan | 6-4,6-3 |
| ITF M25 Nonthaburi | 2019/05/29 04:35 | Natthasith Kunsuwan v Kasidit Samrej | 6-4,3-6,5-7 |
| ITF M25 Nonthaburi | 2019/05/28 04:40 | Natthasith Kunsuwan v Michael Mat'chand | 6-4,6-3 |
| ITF M25 Nonthaburi | 2019/05/22 03:00 | Natthasith Kunsuwan v Jayden Court | 7-5,3-6,6-7 |
| ITF M25 Luan | 2019/05/15 07:40 | Rimpei Kawakami v Natthasith Kunsuwan | 6-4,6-1 |
| ITF M25 Luan | 2019/05/14 03:25 | Natthasith Kunsuwan v Guan Kai Wang | 6-0,6-0 |
| ITF M25 Nonthaburi | 2019/07/30 02:30 | Daisuke Sumizawa v Cameron Green | 6-4,5-7,10-8 |
| ITF M25 Nonthaburi | 2019/07/29 05:00 | Daisuke Sumizawa v Hao Yuan Ng | 2-6,6-3,10-6 |
| ITF M25 Nonthaburi | 2019/07/24 02:00 | Daisuke Sumizawa v Sergey Fomin | 3-6,1-6 |
| 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 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 |