Stadium: Court 6 Round: 44 Ground: Hardcourt outdoor
| ITF Japan F2 | 2015/03/15 01:00 | Masaki Sasai v Issei Okamura | 6-3,6-0 |
| ITF Japan F4 | 2014/04/02 02:45 | Issei Okamura v Masaki Sasai | 6-3,6-3 |
| ITF Japan F3 | 2018/03/17 04:00 | Issei Okamura v Arata Onozawa | 7-6,6-0 |
| ITF Japan F2 | 2018/03/15 02:35 | Issei Okamura v Kaito Uesugi | 4-6,5-7 |
| ITF Japan F2 | 2018/03/13 00:30 | Issei Okamura v Rimpei Kawakami | 6-2,6-4 |
| ITF Japan F2 | 2018/03/12 00:30 | Issei Okamura v Kaito Itsusaki | 6-4,6-1 |
| ITF Japan F2 | 2018/03/11 00:30 | Issei Okamura v Yasunori Hashikawa | 6-2,6-1 |
| ITF Japan F1 | 2018/03/07 04:45 | Issei Okamura v Shinji Hazawa | 6-3,1-6,3-6 |
| ITF China F3 | 2018/01/25 05:15 | Issei Okamura v Tsung-Hua Yang | 3-6,1-6 |
| ITF China F3 | 2018/01/24 05:30 | Issei Okamura v Cing-Yang Meng | 7-6,6-2 |
| ITF Japan F3 | 2018/03/17 04:00 | Ryohei Tagata v Masaki Sasai | 5-7,6-3,2-6 |
| ITF Japan F2 | 2018/03/12 00:30 | Jack Murray v Masaki Sasai | 6-4,6-3 |
| ITF Japan F1 | 2018/03/07 01:00 | Masaki Sasai v Yuta Shimizu | 5-7,6-7 |
| ITF Japan F1 | 2018/03/06 01:00 | Sho Shimabukuro v Masaki Sasai | 6-7,3-6 |
| ITF Japan F1 | 2018/03/04 03:00 | Keisuke Numajiri v Masaki Sasai | 1-6,6-3,0-6 |
| ITF Japan F1 | 2018/03/03 05:30 | Kazuki Shimizu v Masaki Sasai | 3-6,2-6 |
| Challenger Toyota Qual | 2017/11/11 02:15 | Chu-Huan Yi v Masaki Sasai | 4-6,6-3,6-4 |
| ITF Thailand F8 Qual | 2017/10/08 06:20 | Masaki Sasai v Clement Larriere | 3-6,3-6 |