| ITF Guam F1 | 2016/05/23 00:00 | Deiton Baughman v Ken Onishi | 6-1,6-4 |
| ITF India F3 | 2016/05/11 04:00 | Ken Onishi v Yuya Ito | 4-6,4-6 |
| ITF India F3 | 2016/05/10 03:30 | Ranjeet Virali-Murugesan v Ken Onishi | 6-7,4-6 |
| ITF India F2 | 2016/05/03 11:00 | Pol Wattanakul v Ken Onishi | 6-4,7-6 |
| ITF Japan F5 | 2016/04/06 00:30 | Ken Onishi v Takao Suzuki | 6-3,4-6,3-6 |
| ITF Japan F5 | 2016/04/04 01:30 | Ken Onishi v Koichi Sano | 6-1,6-0 |
| ITF Japan F5 | 2016/04/03 02:30 | Ken Onishi v Kazuki Shimizu | 6-3,6-2 |
| ITF Japan F4 | 2016/03/27 01:00 | Yosuke Watanuki v Ken Onishi | 6-2,7-6 |
| ITF Guam F1 | 2016/05/27 05:45 | Gengo Kikuchi v Shuichi Sekiguchi | 6-7,6-7 |
| ITF Guam F1 | 2016/05/26 02:25 | Gengo Kikuchi v Shunrou Takeshima | 6-1,6-1 |
| ITF Guam F1 | 2016/05/24 00:00 | Gengo Kikuchi v Ken Onoda | 7-5,6-1 |
| ITF China F7 | 2016/05/17 02:00 | Alexios Halebian v Gengo Kikuchi | 4-6,7-6,3-6 |
| ITF China F6 | 2016/05/12 02:00 | Gengo Kikuchi v Raymond Sarmiento | 5-7,3-6 |
| ITF China F6 | 2016/05/10 02:00 | Gengo Kikuchi v Xiao Gong | 7-5,6-4 |
| ITF Japan F5 | 2016/04/08 01:00 | Makoto Ochi v Gengo Kikuchi | 6-3,6-0 |
| ITF Japan F5 | 2016/04/06 03:10 | Gengo Kikuchi v Soichiro Moritani | 6-4,7-6 |