Stadium: Court 3 Round: 45 Ground: Hardcourt outdoor
| ITF Japan F6 Qual | 2018/04/08 01:00 | Issei Okamura v Hikaru Shiraishi | 6-4,6-3 |
| ITF M15 Nishi-Tokyo | 2019/03/11 02:00 | Issei Okamura v Li-Wei Tan | 6-4,6-0 |
| ITF M25 Mildura | 2019/03/07 02:00 | Issei Okamura v Shuichi Sekiguchi | 3-6,6-3,2-6 |
| ITF M25 Mildura | 2019/03/05 23:00 | Issei Okamura v Aaron Addison | 7-5,6-2 |
| ITF M25 Albury | 2019/02/27 23:30 | Issei Okamura v Alexander Crnokrak | 3-6,2-6 |
| ITF M25 Albury | 2019/02/27 02:15 | Colin Sinclair v Issei Okamura | 6-7,6-2,4-6 |
| ITF M25 Albury | 2019/02/25 23:30 | Issei Okamura v Calum Puttergill | 6-3,3-6,10-6 |
| ITF M25 Albury | 2019/02/24 23:30 | Issei Okamura v Mislav Bosnjak | 6-2,7-6 |
| ITF M15 Anning | 2019/01/10 04:30 | Issei Okamura v Naoki Tajima | 6-4,3-6,4-6 |
| ITF M15 Nishi-Tokyo | 2019/03/11 02:00 | Hikaru Shiraishi v Yuichi Ito | 6-1,7-6 |
| ITF Japan F8 | 2018/06/14 01:00 | Hikaru Shiraishi v Ryota Tanuma | 2-6,4-6 |
| ITF Japan F8 | 2018/06/13 02:40 | Hikaru Shiraishi v Yuto Sakai | 6-2,6-1 |
| ITF Japan F6 Qual | 2018/04/08 01:00 | Issei Okamura v Hikaru Shiraishi | 6-4,6-3 |
| ITF Japan F7 | 2016/06/07 05:10 | Yuichi Ito v Hikaru Shiraishi | 6-1,6-0 |