Stadium: Court 6 Round: 62 Ground: Grass
| ITF Women Hamamatsu Qual | 2017/10/14 00:00 | Makoto Yamaguchi v Ayumi Koshiishi | 1-6,4-6 |
| ITF Women Makinohara | 2017/10/12 03:20 | Miyabi Inoue v Ayumi Koshiishi | 6-4,6-2 |
| ITF Women Makinohara | 2017/10/10 02:55 | Mayuka Aikawa v Ayumi Koshiishi | 2-6,3-6 |
| ITF Women Makinohara Qual | 2017/10/09 00:30 | Chie Kezuka v Ayumi Koshiishi | 3-6,3-6 |
| ITF Women Kyoto | 2017/09/05 02:40 | Ramu Ueda v Ayumi Koshiishi | 6-4,6-2 |
| ITF Women Nanao | 2017/08/29 02:45 | Ayumi Koshiishi v Miyabi Inoue | 2-6,3-6 |
| ITF Women Tsukuba Qual | 2017/08/20 00:30 | Aiko Yoshitomi v Ayumi Koshiishi | 7-5,4-6,6-3 |
| ITF Women Karuizawa Qual | 2017/05/21 04:00 | Ayumi Koshiishi v Ellen Allgurin | 4-6,2-6 |