Stadium: Court 1 Round: 54 Ground: Hardcourt outdoor
| ITF Women Nonthaburi | 2018/08/04 07:40 | Michika Ozeki v Rada Manataweewat | 6-0,6-3 |
| ITF Women Jakarta | 2018/07/19 04:30 | Fitriani Sabatini v Michika Ozeki | 6-2,6-1 |
| ITF Women Jakarta | 2018/07/17 04:45 | Charmaine S Y Seah v Michika Ozeki | 1-6,7-5,6-7 |
| ITF Women Solo | 2018/07/11 02:30 | Rifanty Kahfiani v Michika Ozeki | 6-2,6-4 |
| ITF Women Solo | 2018/07/10 06:00 | Suryaningsih Suryaningsih v Michika Ozeki | 1-6,1-6 |
| ITF Women Daegu | 2018/06/20 02:45 | Michika Ozeki v Kai-Chen Chang | 2-6,3-6 |
| ITF Women Kofu | 2018/06/14 04:20 | Lisa-Marie Rioux v Michika Ozeki | 7-5,7-5 |
| ITF Women Kofu | 2018/06/12 03:05 | Michika Ozeki v Misa Eguchi | 6-1,3-6,6-3 |
| ITF Women Nonthaburi | 2018/08/04 06:10 | Jia Qi Ren v Ayumi Koshiishi | 1-6,6-1,2-6 |
| ITF Women Taipei | 2018/07/26 02:00 | Ayumi Koshiishi v Hua-Chen Lee | 3-6,0-6 |
| ITF Women Taipei | 2018/07/24 03:45 | Ting-Pei Chang v Ayumi Koshiishi | 2-6,1-6 |
| ITF Women Hong Kong | 2018/07/13 03:00 | Sakura Hosogi v Ayumi Koshiishi | 3-6,6-4,6-3 |
| ITF Women Hong Kong | 2018/07/12 02:00 | Ayumi Koshiishi v Zeel Desai | 7-5,6-1 |
| ITF Women Hong Kong | 2018/07/11 02:00 | Ayumi Koshiishi v Prerna Bhambri | 6-2,6-2 |
| ITF Women Hong Kong | 2018/07/10 03:50 | Ayumi Koshiishi v Haine Ogata | 6-1,6-4 |
| ITF Women Singapore Qual | 2018/06/10 02:00 | Deria Nur Haliza v Ayumi Koshiishi | 1-6,6-4,6-3 |