Round: 26 Ground: Hardcourt outdoor
| ITF Hong Kong F5 | 2016/12/26 23:00 | Jumpei Yamasaki v Aria Harajchi | 6-2,6-3 |
| ITF Greece F11 | 2016/11/23 09:55 | Jumpei Yamasaki v Theo Fournerie | 6-3,6-7,2-6 |
| ITF Greece F10 | 2016/11/19 08:00 | Vaclav Safranek v Jumpei Yamasaki | 6-1,6-4 |
| Australian Open | 2016/11/18 09:30 | Lenny Hampel v Jumpei Yamasaki | 6-7,6-4,5-7 |
| ITF Greece F10 | 2016/11/16 08:00 | Mor Bulis v Jumpei Yamasaki | 2-6,1-6 |
| ITF Greece F9 | 2016/11/11 08:00 | Christian Hirschmueller v Jumpei Yamasaki | 6-1,6-1 |
| ITF Greece F9 | 2016/11/10 08:00 | Jumpei Yamasaki v Germain Gigounon | 4-6,6-4,6-1 |
| ITF Greece F9 | 2016/11/08 07:30 | Jumpei Yamasaki v Petar Conkic | 6-2,6-4 |
| ITF Hong Kong F5 | 2016/12/26 23:00 | Wei-De Lin v Ken Onishi | 6-7,3-6 |
| Others | 2016/11/12 02:10 | Ken Onishi v Arata Onozawa | 3-6,4-6 |
| Challenger Kobe | 2016/11/09 05:00 | Ken Onishi v Go Soeda | 0-6,6-7 |
| Challenger Kobe | 2016/11/08 02:00 | Makoto Ochi v Ken Onishi | 3-6,1-6 |
| ITF Vietnam F9 | 2016/11/01 04:10 | Evan Song v Ken Onishi | 2-6,6-4,6-2 |
| ITF Vietnam F8 | 2016/10/29 03:00 | Rishab Agarwal v Ken Onishi | 6-1,6-3 |
| ITF Vietnam F8 | 2016/10/28 03:00 | Ken Onishi v Evan Song | 7-5,4-6,6-4 |
| ITF Vietnam F8 | 2016/10/27 04:30 | Nam Hoang Ly v Ken Onishi | 7-5,4-6,2-6 |