Estádio: Court 8 Round: 45 Ground: Hardcourt outdoor
| ITF - M15 Mornington | 2019/03/25 23:00 | Daisuke Sumizawa v Stefan Skadarka | 6-3,6-7,7-10 |
| ITF - M15 Mornington | 2019/03/24 23:00 | Daisuke Sumizawa v Zac Osborne | 6-2,6-1 |
| ITF - M15 Mornington | 2019/03/17 23:00 | Daisuke Sumizawa v Thomas Bosancic | 3-6,4-6 |
| ITF - M15 Nishi-Tokyo | 2019/03/12 02:35 | Rimpei Kawakami v Daisuke Sumizawa | 6-2,6-1 |
| ITF - M15 Nishi-Tokyo | 2019/03/11 03:30 | Daisuke Sumizawa v Quentin Folliot | 6-2,6-2 |
| ITF M15 Nishi-Tama | 2019/03/06 03:20 | Yuki Mochizuki v Daisuke Sumizawa | 6-1,7-6 |
| ITF M15 Nishi-Tama | 2019/03/05 01:00 | Kazuki Shimizu v Daisuke Sumizawa | 2-6,2-6 |
| ITF - M15 Anning | 2019/01/07 01:30 | Daisuke Sumizawa v Ye Cong Mo | 1-6,4-6 |
| ITF - M15 Tsukuba | 2019/03/27 01:00 | Makoto Ochi v Kazuki Nishiwaki | 6-3,6-1 |
| ITF M15 Kofu | 2019/03/20 05:10 | Mick Veldheer v Kazuki Nishiwaki | 4-6,6-1,6-4 |
| ITF - M15 Sharm El Sheikh | 2019/02/18 12:15 | Kazuki Nishiwaki v Giorgio Ricca | 7-5,6-7,6-10 |
| ITF - M15 Sharm El Sheikh | 2019/02/18 07:30 | Kazuki Nishiwaki v Mathys Erhard | 6-0,6-1 |
| ITF - M15 Anning | 2019/01/12 05:05 | Kazuki Nishiwaki v Agustin Velotti | 6-7,2-6 |
| ITF - M15 Anning | 2019/01/11 04:40 | Kazuki Nishiwaki v Nitin Kumar Sinha | 6-7,6-2,6-4 |
| ITF - M15 Anning | 2019/01/10 03:00 | Taisei Ichikawa v Kazuki Nishiwaki | 5-7,3-6 |
| ITF - M15 Anning | 2019/01/08 04:20 | Kazuki Nishiwaki v Tianjia Guo | 6-1,6-1 |