Round: 26 Ground: Hardcourt outdoor
| ITF China F5 | 2016/04/12 04:30 | Aoran Wang v Issei Okamura | 3-6,1-6 |
| ITF Japan F5 | 2016/04/05 04:35 | Issei Okamura v Ito, Yuya | 0-6,3-6 |
| ITF Japan F4 | 2016/03/31 01:00 | Issei Okamura v Tearney, Finn | 3-6,2-6 |
| ITF Japan F4 | 2016/03/30 01:00 | Issei Okamura v Wachiramanowong, Kittipong | 6-4,6-2 |
| ITF Japan F2 | 2016/03/17 02:30 | Issei Okamura v Sidharth Rawat | 4-6,6-1,6-7 |
| ITF Japan F2 | 2016/03/15 04:25 | Kim, Young Seok v Issei Okamura | 7-6,3-6,4-6 |
| ITF Japan F1 | 2016/03/12 04:10 | Issei Okamura v Huang, Liang-Chi | 3-6,4-6 |
| ITF Japan F1 | 2016/03/12 01:00 | Singh, Karunuday v Issei Okamura | 3-6,2-6 |
| ITF China F5 | 2016/04/12 07:35 | Wei-De Lin v Sekiguchi, Shuichi | 1-6,0-6 |
| ITF China F4 | 2016/04/09 05:20 | Sekiguchi, Shuichi v Balaji, N. Sriram | 6-3,3-6,5-7 |
| ITF China F4 | 2016/04/08 04:00 | Sekiguchi, Shuichi v Xia, Zihao | 6-1,6-1 |
| ITF China F4 | 2016/04/05 02:00 | Sekiguchi, Shuichi v Fajing Sun | 6-4,6-0 |
| ITF Japan F3 | 2016/03/25 03:00 | Duckhee Lee v Sekiguchi, Shuichi | 7-5,6-3 |
| ITF Japan F3 | 2016/03/24 03:15 | Kim, Young Seok v Sekiguchi, Shuichi | 2-6,0-6 |
| ITF Japan F3 | 2016/03/23 01:00 | Ito, Yuya v Sekiguchi, Shuichi | 5-7,4-6 |
| ITF Japan F3 | 2016/03/22 03:30 | Tanuma, Ryota v Sekiguchi, Shuichi | 6-4,1-6,2-6 |