Stadium: Court 1 Round: 25 Ground: Hardcourt outdoor
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/06/10 00:00 | Miyamoto, Ayumi v Hikaru Sato | 6-1,6-0 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/06/09 04:00 | Miyamoto, Ayumi v Funa Kozaki | 6-2,6-2 |
| Karuizawa, Singles W-WITF-JPN-10A | 2018/05/24 04:15 | Miyamoto, Ayumi v Hondo, Sakura | 5-7,1-6 |
| Karuizawa, Singles W-WITF-JPN-10A | 2018/05/22 01:00 | Miyamoto, Ayumi v Michika Ozeki | 6-1,6-1 |
| ITF Women Karuizawa Qual | 2018/05/21 01:00 | Miyamoto, Ayumi v Nakazawa, Natsuho | 6-1,6-2 |
| ITF Women Kurume Qual | 2018/05/13 00:30 | Miyamoto, Ayumi v Mai Hontama | 2-6,7-6,2-6 |
| ITF Women Fukuoka Qual | 2018/05/06 06:00 | Moore, Tara v Miyamoto, Ayumi | 6-4,6-2 |
| ITF Women Gifu Qual | 2018/04/29 06:45 | Kyoka Okamura v Miyamoto, Ayumi | 6-7,7-6,7-6 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/06/10 00:00 | Kajuru, Ange Oby v Mana Kawamura | 6-7,4-6 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/06/09 04:00 | Mana Kawamura v Makoto Yamaguchi | 7-6,7-5 |
| ITF Women Karuizawa Qual | 2018/05/21 01:30 | Kanako Morisaki v Mana Kawamura | 5-7,6-4,6-3 |
| ITF Women Karuizawa Qual | 2018/05/20 02:30 | Mana Kawamura v Oshino, Suzuho | 6-2,6-2 |
| Toyota, Singles W-WITF-JPN-02A | 2018/03/13 01:00 | Mana Kawamura v Ayano Shimizu | 3-6,6-3,4-6 |
| ITF Women Makinohara Qual | 2017/10/08 02:00 | Mana Kawamura v Kajuru, Ange Oby | 4-6,4-6 |
| ITF Women Kyoto | 2017/09/02 03:00 | Mana Kawamura v Himari Sato | 3-6,1-6 |
| ITF Women Nanao Qual | 2017/08/28 01:00 | Yoshitomi, Aiko v Mana Kawamura | 1-6,6-3,6-2 |