| ITF China F7 | 2017/05/16 07:00 | Issei Okamura v Yusuke Takahashi | 7-5,2-6,4-6 |
| ITF China F6 | 2017/05/10 06:05 | Dayne Kelly v Issei Okamura | 6-4,6-3 |
| ITF China F6 | 2017/05/08 05:30 | Ruikai Wang v Issei Okamura | 3-6,1-6 |
| Challenger Anning Qual | 2017/04/22 03:35 | Issei Okamura v Denys Molchanov | 6-4,3-6,4-6 |
| Challenger Taipei Qual | 2017/04/17 04:35 | Ruan Roelofse v Issei Okamura | 6-4,6-2 |
| Challenger Taipei Qual | 2017/04/16 05:55 | Shao-Fan Liu v Issei Okamura | 6-7,6-4,3-6 |
| ITF Japan F5 | 2017/04/04 00:30 | Issei Okamura v Takao Suzuki | 6-7,3-6 |
| ITF Japan F4 | 2017/03/28 03:00 | Kaito Uesugi v Issei Okamura | 6-3,6-3 |
| ITF Singapore F1 Qual | 2017/05/22 06:10 | Kazuki Nishiwaki v Vignesh Peranamallur | 6-1,6-1 |
| ITF Singapore F1 Qual | 2017/05/21 04:00 | Yu Hsiang Chiu v Kazuki Nishiwaki | 0-6,2-6 |
| ITF Japan F5 | 2017/04/03 05:00 | Kazuki Nishiwaki v Tung-Lin Wu | 3-6,5-7 |
| ITF Japan F5 | 2017/04/02 01:00 | Tomohiro Masabayashi v Kazuki Nishiwaki | 1-6,6-7 |
| ITF Japan F5 | 2017/04/01 01:00 | Yuto Sakai v Kazuki Nishiwaki | 2-6,6-7 |
| ITF Japan F4 | 2017/03/25 02:00 | Yuki Matsuo v Kazuki Nishiwaki | 5-7,7-6,6-3 |
| ITF Japan F3 | 2017/03/19 01:00 | Sho Shimabukuro v Kazuki Nishiwaki | 6-3,7-5 |
| ITF Japan F3 | 2017/03/18 08:00 | Kazuki Nishiwaki v Zhaoyi Cao | 6-3,6-0 |