Stadium: Court 3 Round: 25 Ground: Synthetic outdoor
| ITF Women Makinohara | 2017/10/12 03:20 | Miyabi Inoue 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 Hamamatsu | 2018/10/15 03:40 | Ayumi Koshiishi v Karen Tsutsumi | 6-2,6-1 |
| ITF Women Hamamatsu | 2018/10/14 04:30 | Ayumi Koshiishi v Mayuka Aikawa | 6-3,6-2 |
| ITF Women Hamamatsu | 2018/10/14 00:00 | Ayumi Koshiishi v Yui Chikaraishi | 7-6,6-2 |
| ITF Women Makinohara | 2018/10/11 00:30 | Ayumi Koshiishi v Michika Ozeki | 2-6,0-6 |
| ITF Women Makinohara | 2018/10/09 00:30 | Ayumi Koshiishi v Kisa Yoshioka | 7-5,6-3 |
| ITF Women Nanao | 2018/08/30 03:00 | Ayumi Koshiishi v Ayano Shimizu | 5-7,3-6 |
| ITF Women Nanao | 2018/08/29 03:30 | Ayumi Koshiishi v Tori Kinard | 7-5,5-7,6-4 |
| ITF Women Nanao | 2018/08/27 05:15 | Ayumi Koshiishi v Yu-Ting Hsieh | 6-0,6-0 |
| WTA Tokyo | 2018/09/15 07:00 | Zarina Diyas v Miyabi Inoue | 6-4,6-3 |
| ITF Women Nanao | 2018/08/30 03:00 | Miyabi Inoue v Kyoka Okamura | 2-6,4-6 |
| ITF Women Nanao | 2018/08/28 03:00 | Miyabi Inoue v Yidi Yang | 6-3,6-2 |
| ITF Women Tsukuba | 2018/08/21 00:30 | Yuuki Tanaka v Miyabi Inoue | 6-3,6-1 |
| ITF Women Guiyang | 2018/08/16 02:00 | Yue Yuan v Miyabi Inoue | 4-6,6-2,6-3 |
| ITF Women Guiyang | 2018/08/14 08:10 | Jiahui Chen v Miyabi Inoue | 2-6,2-6 |
| ITF Women Jinan | 2018/08/08 02:00 | Miyabi Inoue v Fang Ying Xun | 3-6,2-6 |
| WTA Nanchang Qual | 2018/07/22 09:00 | Fang Ying Xun v Miyabi Inoue | 7-5,6-4 |