Stadium: Court 13 Round: 25 Ground: Hardcourt outdoor
| ITF Women Makinohara Qual | 2017/10/09 02:10 | Reina Takahashi v Mitsumi Kawasaki | 6-3,6-3 |
| ITF Women Kofu Qual | 2018/06/10 00:00 | Reina Takahashi v Misaki Matsuda | 6-7,1-6 |
| ITF Women Kofu Qual | 2018/06/09 04:00 | Reina Takahashi v Nao Nishida | 6-2,6-3 |
| ITF Women Karuizawa Qual | 2018/05/21 02:40 | Sakura Hondo v Reina Takahashi | 6-1,5-7,6-1 |
| ITF Women Karuizawa Qual | 2018/05/20 04:00 | Chie Kezuka v Reina Takahashi | 6-3,1-6,3-6 |
| ITF Women Kofu Qual | 2018/03/24 03:00 | Reina Takahashi v Shiho Akita | 4-6,1-6 |
| ITF Women Nishi-Tama | 2018/03/21 05:35 | Reina Takahashi v Rika Fujiwara | 6-7,7-6,3-6 |
| ITF Women Toyota Qual | 2018/03/10 01:00 | Rion Itaya v Reina Takahashi | 6-3,6-4 |
| ITF Women Tokyo Qual | 2017/11/05 03:00 | Reina Takahashi v Haruna Arakawa | 1-6,2-6 |
| ITF Women Kofu | 2018/06/12 01:00 | Yuuki Tanaka v Mitsumi Kawasaki | 6-0,6-2 |
| ITF Women Karuizawa Qual | 2018/05/21 01:00 | Mitsumi Kawasaki v Rina Saigo | 1-6,2-6 |
| ITF Women Karuizawa Qual | 2018/05/20 02:30 | Mitsumi Kawasaki v Minami Akiyama | 6-3,6-3 |
| ITF Women Kurume Qual | 2018/05/14 04:30 | Mitsumi Kawasaki v Anastasia E Nefedova | 3-6,2-6 |
| ITF Women Kurume Qual | 2018/05/13 08:40 | Mitsumi Kawasaki v Ayano Sonoda | 6-1,6-1 |
| ITF Women Fukuoka Qual | 2018/05/06 04:15 | Mitsumi Kawasaki v Abbie Myers | 1-6,2-6 |
| ITF Women Gifu Qual | 2018/04/29 01:00 | Hiroko Kuwata v Mitsumi Kawasaki | 6-0,7-6 |
| ITF Women Osaka Qual | 2018/04/07 01:30 | Rebecca Marino v Mitsumi Kawasaki | 6-1,6-4 |