Stadium: Court 6 Round: 62 Ground: Clay
| ITF Japan F5 | 2018/03/31 00:30 | Gengo Kikuchi v Daisuke Sumizawa | 6-1,6-3 |
| ITF Turkey F11 | 2018/03/18 07:00 | Marc Fornell-Mestres v Daisuke Sumizawa | 6-4,6-4 |
| ITF Turkey F11 | 2018/03/17 08:30 | Samuel Bothwell v Daisuke Sumizawa | 0-6,4-6 |
| ITF Turkey F10 | 2018/03/10 08:30 | Gabriel Donev v Daisuke Sumizawa | 6-3,6-3 |
| ITF Turkey F9 | 2018/03/04 08:30 | Daisuke Sumizawa v Neven Krivokuca | 1-6,2-6 |
| ITF Turkey F9 | 2018/03/03 07:00 | Daisuke Sumizawa v Nutdanai Sincharoenwattana | 6-1,7-6 |
| ITF Turkey F8 | 2018/02/25 07:30 | Bogdan Ionut Apostol v Daisuke Sumizawa | 7-6,6-7,6-0 |
| ITF Turkey F8 | 2018/02/24 07:00 | Daisuke Sumizawa v Vicente O Moratalla | 6-7,7-5,6-2 |
| ITF Japan F3 | 2018/03/17 00:30 | Keisuke Watanuki v Keisuke Numajiri | 3-6,1-6 |
| ITF Japan F1 | 2018/03/04 03:00 | Keisuke Numajiri v Masaki Sasai | 1-6,6-3,0-6 |
| ITF Turkey F8 | 2018/02/24 09:30 | Keisuke Numajiri v Ivan Davydov | 1-6,7-6,5-7 |
| ITF Turkey F7 | 2018/02/17 06:30 | Bogdan Bobrov v Keisuke Numajiri | 6-3,6-2 |
| ITF Vietnam F3 | 2017/11/21 06:10 | Sho Katayama v Keisuke Numajiri | 6-4,6-4 |
| ITF Vietnam F3 | 2017/11/20 04:00 | Lawrence Bataljin v Keisuke Numajiri | 6-4,2-6,6-3 |
| ITF Vietnam F2 | 2017/11/12 04:00 | Jakub Paul v Keisuke Numajiri | 6-7,6-4,6-1 |
| ITF Malaysia F3 | 2017/10/29 00:00 | Yuichi Ito v Keisuke Numajiri | 6-4,6-2 |