Stadium: Court 9 Round: 62 Ground: Synthetic outdoor
| ITF Women Makinohara | 2017/10/10 02:55 | Mayuka Aikawa v Ayumi Koshiishi | 2-6,3-6 |
| 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 |
| ITF Women Nanao | 2018/08/26 05:00 | Ayumi Koshiishi v Ayaka Ozeki | 4-6,6-3,6-3 |
| ITF Women Tsukuba | 2018/08/20 01:00 | Nagi Hanatani v Ayumi Koshiishi | 6-2,7-6 |
| ITF Women Hamamatsu | 2018/10/14 00:00 | Sae Haraguchi v Mayuka Aikawa | 1-6,6-3,5-7 |
| ITF Women Makinohara | 2018/10/07 03:00 | Ayumi Miyamoto v Mayuka Aikawa | 6-4,6-0 |
| ITF Women Kyoto | 2018/09/05 03:30 | Anri Nagata v Mayuka Aikawa | 6-3,6-4 |
| ITF Women Kyoto | 2018/09/02 03:00 | Miyu Nakashima v Mayuka Aikawa | 4-6,4-6 |
| ITF Women Nanao | 2018/08/27 04:45 | Mayuka Aikawa v Kumi So | 2-6,4-6 |
| ITF Women Nanao | 2018/08/26 04:15 | Ivana Popovic v Mayuka Aikawa | 4-6,4-6 |
| ITF Women Nanao | 2018/08/26 01:00 | Mayuka Aikawa v Chinatsu Shimizu | 6-3,6-3 |
| ITF Women Evansville | 2018/07/25 17:25 | Savanna Ly-Nguyen v Mayuka Aikawa | 6-4,6-1 |