Stadium: Court 9 Round: 62 Ground: Hardcourt outdoor
| ITF W25 Kashiwa | 2023/04/03 01:00 | Katarina Kozarov v Ayumi Koshiishi | 6-0,6-3 |
| ITF W25 Kofu | 2023/03/29 04:20 | Ayumi Koshiishi v Eri Hozumi | 4-6,2-6 |
| ITF W15 Hinode | 2023/03/26 00:30 | Natsumi Kawaguchi v Ayumi Koshiishi | 6-1,6-2 |
| ITF W15 Hinode | 2023/03/24 00:00 | Yuka Hosoki v Ayumi Koshiishi | 7-5,2-6,0-6 |
| ITF W15 Hinode | 2023/03/23 02:35 | Chisa Hosonuma v Ayumi Koshiishi | 2-6,1-6 |
| ITF W15 Hinode | 2023/03/22 01:00 | Momoko Nishio v Ayumi Koshiishi | 4-6,6-7 |
| ITF W15 Kuching | 2023/03/05 01:30 | Hanyu Guo v Ayumi Koshiishi | 7-5,2-6,1-6 |
| ITF W15 Kuching | 2023/03/04 01:30 | Shuo Feng v Ayumi Koshiishi | 0-6,1-6 |