Round: 25 Ground: Hardcourt outdoor
| ITF Japan F8 | 2016/06/15 04:30 | Ryota Tanuma v Sho Katayama | 3-6,1-6 |
| ITF Japan F7 | 2016/06/09 01:00 | Yusuke Watanuki v Ryota Tanuma | 6-0,6-2 |
| ITF Japan F7 | 2016/06/06 01:00 | Ryota Tanuma v Naoto Kai | 6-4,6-3 |
| ITF Japan F6 | 2016/05/31 04:25 | Kento Takeuchi v Ryota Tanuma | 6-3,3-6,6-2 |
| ITF Spain F15 | 2016/05/27 16:05 | Eduardo Struvay v Ryota Tanuma | 6-4,6-2 |
| ITF Spain F15 Qual | 2016/05/23 10:20 | Ryota Tanuma v Leo Julien Sebaoun | 7-6,4-6,6-2 |
| ITF Spain F15 Qual | 2016/05/21 12:30 | Ryota Tanuma v Alex M Pujolras | 6-0,6-1 |
| ITF Spain F14 | 2016/05/18 10:00 | Ryota Tanuma v Jaume Munar | 6-4,2-6,5-7 |
| ITF Hong Kong F2 Qual | 2016/06/15 22:00 | Mikelis Libietis v Arata Onozawa | 6-4,7-6 |
| ITF Hong Kong F2 Qual | 2016/06/14 22:00 | Zihao Xia v Arata Onozawa | 4-6,2-6 |
| ITF Japan F7 | 2016/06/08 03:30 | Yuya Ito v Arata Onozawa | 6-4,6-1 |
| ITF Japan F7 | 2016/06/06 05:05 | Arata Onozawa v Ken Onishi | 6-4,6-7,6-0 |
| ITF Japan 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 |