Round: 25 Ground: Synthetic outdoor
| ITF - Japão F1 | 2015/03/12 01:00 | Arata Onozawa v Ken Onishi | 3-6,6-1,5-7 |
| ITF - Japão F6 | 2016/05/31 01:00 | Makoto Ochi v Arata Onozawa | 6-2,6-3 |
| ITF - China F7 | 2016/05/17 04:30 | Arata Onozawa v Wei-De Lin | 3-6,3-6 |
| ITF - China F6 | 2016/05/12 02:00 | Arata Onozawa v Michael Geerts | 4-6,6-7 |
| ITF - China F6 | 2016/05/10 04:20 | Yuqing Ning v Arata Onozawa | 3-6,7-5,4-6 |
| ITF - Japão F5 | 2016/04/08 01:00 | Arata Onozawa v Yuichi Ito | 6-1,6-7,4-6 |
| ITF - Japão F5 | 2016/04/05 07:30 | Arata Onozawa v Kaito Uesugi | 6-3,6-4 |
| ITF - China F2 | 2016/02/24 02:00 | Arata Onozawa v Jordan Ubiergo | 3-6,2-6 |
| ITF - China F2 | 2016/02/22 05:20 | Jiaqi Duan v Arata Onozawa | 6-7,3-6 |
| ITF - Japão F6 | 2016/05/31 02:30 | Ken Onishi v Gengo Kikuchi | 1-6,4-6 |
| ITF - Guame F1 | 2016/05/23 00:00 | Deiton Baughman v Ken Onishi | 6-1,6-4 |
| ITF - Índia F3 | 2016/05/11 04:00 | Ken Onishi v Yuya Ito | 4-6,4-6 |
| ITF - Índia F3 | 2016/05/10 03:30 | Ranjeet Virali-Murugesan v Ken Onishi | 6-7,4-6 |
| ITF - Índia F2 | 2016/05/03 11:00 | Pol Wattanakul v Ken Onishi | 6-4,7-6 |
| ITF - Japão F5 | 2016/04/06 00:30 | Ken Onishi v Takao Suzuki | 6-3,4-6,3-6 |
| ITF - Japão F5 | 2016/04/04 01:30 | Ken Onishi v Koichi Sano | 6-1,6-0 |
| ITF - Japão F5 | 2016/04/03 02:30 | Ken Onishi v Kazuki Shimizu | 6-3,6-2 |