Stadium: COURT F Round: 26 Ground: Synthetic outdoor
| ITF Women Nonthaburi | 2018/08/05 04:15 | Michika Ozeki v Ayumi Koshiishi | 7-6,5-7,3-6 |
| ITF Women Nonthaburi | 2018/08/11 03:00 | Ayumi Koshiishi v Punnin Kovapitukted | 2-6,2-6 |
| ITF Women Nonthaburi | 2018/08/06 05:15 | Lou Brouleau v Ayumi Koshiishi | 6-1,6-3 |
| ITF Women Nonthaburi | 2018/08/05 04:15 | Michika Ozeki v Ayumi Koshiishi | 7-6,5-7,3-6 |
| 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 Nonthaburi | 2018/08/11 06:45 | Michika Ozeki v Akari Inoue | 6-3,6-4 |
| ITF Women Nonthaburi | 2018/08/05 04:15 | Michika Ozeki v Ayumi Koshiishi | 7-6,5-7,3-6 |
| 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 |