Stadium: Court 14 Round: 25 Ground: Synthetic outdoor
| ITF Women Karuizawa Qual | 2018/05/21 01:00 | Ayumi Miyamoto v Natsuho Nakazawa | 6-1,6-2 |
| ITF Women Kurume Qual | 2018/05/13 00:30 | Ayumi Miyamoto v Mai Hontama | 2-6,7-6,2-6 |
| ITF Women Fukuoka Qual | 2018/05/06 06:00 | Tara Moore v Ayumi Miyamoto | 6-4,6-2 |
| ITF Women Gifu Qual | 2018/04/29 06:45 | Kyoka Okamura v Ayumi Miyamoto | 6-7,7-6,7-6 |
| ITF Women Gifu Qual | 2018/04/29 03:15 | Ayumi Miyamoto v Yuki Naito | 6-2,7-5 |
| ITF Women Osaka Qual | 2018/04/08 03:30 | Ayumi Miyamoto v Xinyu Wang | 1-6,3-6 |
| ITF Women Osaka Qual | 2018/04/07 05:30 | Chihiro Takayama v Ayumi Miyamoto | 2-6,4-6 |
| ITF Women Kashiwa Qual | 2018/04/01 02:00 | Miyabi Inoue v Ayumi Miyamoto | 6-4,7-5 |
| ITF Women Kurume Qual | 2018/05/15 01:00 | Sakura Hondo v Michika Ozeki | 0-6,6-3,6-2 |
| ITF Women Kurume Qual | 2018/05/14 01:00 | Chisa Hosonuma v Michika Ozeki | 6-7,2-6 |
| ITF Women Kurume Qual | 2018/05/13 00:30 | Akari Inoue v Michika Ozeki | 2-6,6-1,4-6 |
| ITF Women Fukuoka Qual | 2018/05/06 02:40 | Olivia Tjandramulia v Michika Ozeki | 6-2,7-6 |
| WTA Anning Qual | 2018/04/28 06:30 | Xu Liu Sun v Michika Ozeki | 7-6,7-6 |
| ITF Women Quanzhou Qual | 2018/04/21 08:05 | Ying Zhang v Michika Ozeki | 3-6,6-3,6-1 |
| ITF Women Canberra | 2018/03/28 23:00 | Katy Dunne v Michika Ozeki | 6-3,6-0 |
| ITF Women Canberra | 2018/03/27 00:50 | Michika Ozeki v Ramona Mataruga | 6-4,6-1 |