Stadium: Court 6 Round: 62 Ground: Clay
| ITF Japan F6 Qual | 2018/04/08 04:00 | Rio Noguchi v Kazuki Nishiwaki | 6-2,6-7,0-6 |
| ITF Japan F6 Qual | 2018/04/07 01:00 | Tamaki Yamao v Kazuki Nishiwaki | 6-4,3-6,3-6 |
| ITF Egypt F10 | 2018/03/21 10:00 | Kazuki Nishiwaki v Benjamin Lock | 6-7,4-6 |
| ITF Egypt F10 | 2018/03/19 08:00 | Michel Vernier v Kazuki Nishiwaki | 3-6,2-6 |
| ITF Egypt F10 | 2018/03/18 12:00 | Bruno Britez v Kazuki Nishiwaki | 6-7,2-6 |
| ITF Egypt F10 | 2018/03/17 14:30 | Kazuki Nishiwaki v Anton Chekhov | 6-2,6-2 |
| ITF Egypt F9 | 2018/03/15 10:30 | Benjamin Lock v Kazuki Nishiwaki | 6-2,6-3 |
| ITF Egypt F9 | 2018/03/14 10:25 | Kazuki Nishiwaki v Dejan Katic | 6-4,6-4 |
| ITF Japan F3 | 2018/03/17 04:00 | Issei Okamura v Arata Onozawa | 7-6,6-0 |
| Challenger Kyoto Qual | 2018/02/17 06:55 | Cheong-Eui Kim v Arata Onozawa | 2-6,6-3,6-4 |
| ITF Vietnam F3 | 2017/11/23 03:00 | Arjun Kadhe v Arata Onozawa | 7-5,6-2 |
| ITF Vietnam F3 | 2017/11/21 03:00 | Arata Onozawa v Shunrou Takeshima | 6-0,6-3 |
| ITF Vietnam F3 | 2017/11/20 03:00 | Mislav Bosnjak v Arata Onozawa | 0-6,2-6 |
| ITF Vietnam F3 | 2017/11/19 07:00 | Huynh Thinh v Arata Onozawa | 2-6,0-6 |
| ITF Vietnam F1 | 2017/11/04 05:00 | Chanchai Sookton-Eng v Arata Onozawa | 5-7,3-6 |
| ITF Thailand F6 Qual | 2017/08/13 05:00 | Arata Onozawa v Chayanon Kaewsuto | 6-4,4-6,3-6 |