轮: 54 Ground: Synthetic outdoor
| ITF日本F6资格赛 | 2018/04/08 01:00 | Hajime Nakashima v Masaki Sasai | 6-2,6-1 |
| ITF日本F5 | 2018/04/02 03:40 | Masaki Sasai v 高桥雄介 | 6-3,3-6,3-6 |
| ITF日本F5 | 2018/04/01 00:30 | 肯小野田 v Masaki Sasai | 3-6,1-6 |
| ITF日本F4 | 2018/03/25 01:00 | 森谷宗一郎 v Masaki Sasai | 6-4,6-3 |
| ITF日本F4 | 2018/03/24 00:00 | 熊阪拓也 v Masaki Sasai | 3-6,6-4,3-6 |
| ITF日本F3 | 2018/03/18 01:30 | 冈村一成 v Masaki Sasai | 6-3,6-1 |
| ITF日本F3 | 2018/03/17 04:00 | Ryohei Tagata v Masaki Sasai | 5-7,6-3,2-6 |
| ITF日本F2 | 2018/03/12 00:30 | 杰克•墨瑞 v Masaki Sasai | 6-4,6-3 |