Stadium: Court 7 Round: 62 Ground: Hardcourt outdoor
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/03/24 04:00 | Zhang, Ling v Hasegawa, Mami | 6-4,4-6,6-7 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/22 03:00 | Hasegawa, Mami v Gatto-Monticone, Giulia | 2-6,1-6 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/21 02:00 | Hasegawa, Mami v Makoto Yamaguchi | 6-4,6-2 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/19 01:00 | Yukina Saigo v Hasegawa, Mami | 3-6,4-6 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/18 01:00 | Ishino, Aoi v Hasegawa, Mami | 5-7,0-6 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/17 01:00 | Hasegawa, Mami v Kajuru, Ange Oby | 6-4,2-6,6-2 |
| ITF Women Toyota Qual | 2018/03/10 03:00 | Hasegawa, Mami v Ushijima, Risa | 1-6,6-3,2-6 |
| ITF Women Hamamatsu Qual | 2017/10/17 06:00 | Hasegawa, Mami v Ayumi Koshiishi | 2-6,6-3,6-7 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/03/24 04:00 | Kezuka, Chie v Takahata, Kotomi | 4-6,5-7 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/19 01:00 | Takahata, Kotomi v Furuya, Michiru | 7-6,5-7,4-6 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/18 01:00 | Takahata, Kotomi v Nishizato, Kiko | 6-3,6-3 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/17 04:00 | Takahata, Kotomi v Haraguchi, Sae | 6-1,6-1 |
| Burnie, Qualifications Simples W-WITF-AUS-01C | 2018/01/27 23:00 | Ren, Jia Qi v Takahata, Kotomi | 6-7,6-3,6-1 |
| ITF Women Toyota Qual | 2017/11/12 01:40 | Nishimoto, Megumi v Takahata, Kotomi | 6-3,2-6,6-3 |
| Makinohara, Singles Qualifying W-WITF-JPN-15A | 2017/10/11 00:30 | Takahata, Kotomi v Cheong, Naomi | 0-6,1-6 |
| WTA Dalian Qual | 2017/09/03 06:10 | Hiroko Kuwata v Takahata, Kotomi | 6-2,6-0 |