Round: 25 Ground: Clay
| ITF Japan F7 | 2016/06/06 02:50 | Issei Okamura v Kento Takeuchi | 2-6,3-6 |
| ITF Japan F1 | 2016/03/08 01:00 | Issei Okamura v Kento Takeuchi | 7-6,7-6 |
| Challenger Yokohama Qual | 2017/02/26 01:00 | Kento Takeuchi v Soonwoo Kwon | 6-7,3-6 |
| Challenger Yokohama Qual | 2017/02/25 05:05 | Kento Takeuchi v Sung Min Han | 6-2,6-4 |
| Challenger Kyoto Qual | 2017/02/18 06:30 | Peter Kobelt v Kento Takeuchi | 7-5,7-6 |
| ITF Indonesia F2 | 2017/02/16 04:35 | Dayne Kelly v Kento Takeuchi | 6-2,6-3 |
| ITF Indonesia F2 | 2017/02/14 03:00 | Kento Takeuchi v Jorge Montero | 3-6,6-2,6-2 |
| ITF Indonesia F1 | 2017/02/11 09:40 | Ti Chen v Kento Takeuchi | 3-6,6-3,6-1 |
| ITF Indonesia F1 | 2017/02/10 07:45 | Shintaro Imai v Kento Takeuchi | 2-6,4-6 |
| ITF Indonesia F1 | 2017/02/09 03:00 | Kazuma Kawachi v Kento Takeuchi | 2-6,4-6 |
| ITF China F3 | 2017/03/01 07:35 | Issei Okamura v Marco Bortolotti | 3-6,5-7 |
| ITF China F2 | 2017/02/23 03:00 | Issei Okamura v Rubin Statham | 1-6,3-6 |
| ITF China F2 | 2017/02/21 02:00 | Caio Silva v Issei Okamura | 1-6,0-6 |
| ITF China F1 | 2017/02/15 02:00 | Danilo Petrovic v Issei Okamura | 6-3,6-2 |
| Challenger Launceston Qual | 2017/02/04 01:25 | Issei Okamura v Zach Itzstein | 6-3,4-6,6-7 |
| Challenger Burnie Qual | 2017/01/28 04:10 | Dane Propoggia v Issei Okamura | 6-4,6-2 |
| Challenger Burnie Qual | 2017/01/27 23:00 | Jeremy Beale v Issei Okamura | 6-1,3-6,2-6 |
| ITF Thailand F5 | 2016/12/20 03:00 | Wishaya Trongcharoenchaikul v Issei Okamura | 6-2,7-6 |