Stadium: Indoor 6 Round: 25 Ground: Hardcourt outdoor
| ITF Women Nishi-Tama | 2018/03/19 01:00 | Yukina Saigo v Mami Hasegawa | 3-6,4-6 |
| ITF Women Nishi-Tama | 2018/03/18 01:00 | Aoi Ishino v Mami Hasegawa | 5-7,0-6 |
| ITF Women Nishi-Tama | 2018/03/17 01:00 | Mami Hasegawa v Ange Oby Kajuru | 6-4,2-6,6-2 |
| ITF Women Toyota Qual | 2018/03/10 03:00 | Mami Hasegawa v Risa Ushijima | 1-6,6-3,2-6 |
| ITF Women Hamamatsu Qual | 2017/10/17 06:00 | Mami Hasegawa v Ayumi Koshiishi | 2-6,6-3,6-7 |
| ITF Women Hamamatsu Qual | 2017/10/16 02:00 | Chihiro Takayama v Mami Hasegawa | 3-6,5-7 |
| ITF Women Makinohara | 2017/10/10 00:30 | Mai Hontama v Mami Hasegawa | 6-2,2-6,6-3 |
| ITF Women Makinohara Qual | 2017/10/09 00:30 | Mami Hasegawa v Mei Yamaguchi | 7-5,6-1 |
| ITF Women Hamamatsu Qual | 2017/10/14 00:00 | Makoto Yamaguchi v Ayumi Koshiishi | 1-6,4-6 |
| ITF Women Nishi-Tama | 2017/03/18 02:00 | Kumi So v Makoto Yamaguchi | 6-2,6-2 |