Stadium: Court 5 Round: 27 Ground: Hardcourt outdoor
| ITF W15 Kawaguchi | 2023/06/15 03:35 | Ayumi Koshiishi v Rio Tsuda | 6-4,6-1 |
| ITF W15 Kawaguchi | 2023/06/14 05:35 | Ayumi Koshiishi v Kisa Yoshioka | 7-6,6-3 |
| ITF W25 Tokyo | 2023/05/31 01:00 | Yukina Saigo v Ayumi Koshiishi | 6-4,6-1 |
| ITF W25 Goyang | 2023/05/22 01:00 | Ayumi Koshiishi v Yi Tsen Cho | 2-6,0-6 |
| ITF W25 Goyang | 2023/05/21 01:00 | Ayumi Koshiishi v Eun Ji Lee | 6-3,6-3 |
| ITF W25 Incheon | 2023/05/15 06:40 | Ayumi Koshiishi v Yu Jin Ahn | 4-6,3-6 |
| ITF W25 Incheon | 2023/05/15 02:40 | Ayumi Koshiishi v Qianhui Tang | 5-7,6-3,10-4 |
| ITF W25 Osaka | 2023/04/09 03:00 | Kurea Hayasaka v Ayumi Koshiishi | 6-7,4-6 |