Stadium: Court A Round: 26 Ground: Hardcourt indoor
| ITF W25 Nonthaburi | 2019/07/23 04:20 | Ayumi Koshiishi v Michika Ozeki | 2-6,4-6 |
| ITF Women Makinohara | 2018/10/11 00:30 | Ayumi Koshiishi v Michika Ozeki | 2-6,0-6 |
| ITF Women Nonthaburi | 2018/08/05 04:15 | Michika Ozeki v Ayumi Koshiishi | 7-6,5-7,3-6 |
| ITF W25 Kyoto | 2019/09/04 04:25 | Miharu Imanishi v Ayumi Koshiishi | 3-6,4-6 |
| ITF W25 Kyoto | 2019/09/02 04:00 | Ayumi Koshiishi v Utaka Kishigami | 7-5,7-6 |
| ITF W25 Kyoto | 2019/09/02 00:00 | Ayumi Koshiishi v Hx Izabella Tan | 6-0,6-1 |
| ITF W25 Nanao | 2019/08/27 01:00 | Ayumi Koshiishi v Anri Nagata | 4-6,0-6 |
| ITF W25 Tsukuba | 2019/08/19 00:30 | Yui Chikaraishi v Ayumi Koshiishi | 2-6,6-2,10-7 |
| ITF W25 Nonthaburi | 2019/07/30 02:30 | Yidi Yang v Ayumi Koshiishi | 6-0,6-2 |
| ITF W25 Nonthaburi | 2019/07/29 06:20 | Thasaporn Naklo v Ayumi Koshiishi | 3-6,4-6 |
| ITF W25 Nonthaburi | 2019/07/23 04:20 | Ayumi Koshiishi v Michika Ozeki | 2-6,4-6 |
| ITF W25 Kyoto | 2019/09/04 01:00 | Michika Ozeki v Nana Kawagishi | 6-0,6-2 |
| ITF W25 Nanao | 2019/08/29 07:30 | Mana Ayukawa v Michika Ozeki | 6-3,7-6 |
| ITF W25 Nanao | 2019/08/27 04:55 | Susanne Celik v Michika Ozeki | 0-6,3-6 |
| ITF W25 Tsukuba | 2019/08/20 00:30 | Michika Ozeki v Yui Chikaraishi | 5-7,4-6 |
| ITF W25 Tsukuba | 2019/08/19 00:30 | Michika Ozeki v Sena Takebe | 6-0,6-0 |
| ITF W25 Nonthaburi | 2019/08/02 04:40 | Michika Ozeki v Sabina Sharipova | 2-6,0-6 |
| ITF W25 Nonthaburi | 2019/08/01 02:30 | Fang Ying Xun v Michika Ozeki | 2-6,6-3,5-7 |
| ITF W25 Nonthaburi | 2019/07/31 05:05 | Michika Ozeki v Chompoothip Jandakate | 4-6,6-1,7-6 |