Round: 62 Ground: Synthetic outdoor
| ITF - Makinohara - Feminino | 2018/10/11 00:30 | Ayumi Koshiishi v Michika Ozeki | 2-6,0-6 |
| ITF - Makinohara - Feminino | 2018/10/09 00:30 | Ayumi Koshiishi v Kisa Yoshioka | 7-5,6-3 |
| ITF - Nanao - Feminino | 2018/08/30 03:00 | Ayumi Koshiishi v Ayano Shimizu | 5-7,3-6 |
| ITF - Nanao - Feminino | 2018/08/29 03:30 | Ayumi Koshiishi v Tori Kinard | 7-5,5-7,6-4 |
| ITF - Nanao - Feminino | 2018/08/27 05:15 | Ayumi Koshiishi v Yu-Ting Hsieh | 6-0,6-0 |
| ITF - Nanao - Feminino | 2018/08/26 05:00 | Ayumi Koshiishi v Ayaka Ozeki | 4-6,6-3,6-3 |
| ITF - Tsukuba - Feminino | 2018/08/20 01:00 | Nagi Hanatani v Ayumi Koshiishi | 6-2,7-6 |
| ITF - Tsukuba - Feminino | 2018/08/19 00:30 | Ange Oby Kajuru v Ayumi Koshiishi | 1-6,4-6 |
| ITF - Makinohara - Feminino | 2018/10/07 03:00 | Ari Matsumoto v Yui Chikaraishi | 6-3,6-3 |
| ITF - Quioto - Feminino | 2018/09/03 01:00 | Yui Chikaraishi v Anri Nagata | 4-6,1-6 |
| ITF - Hong Kong - Feminino | 2018/07/08 02:00 | Yui Chikaraishi v Ramona Mataruga | 0-6,2-6 |
| ITF - Singapura - Qualificação - Feminino | 2018/06/09 02:00 | Ramu Ueda v Yui Chikaraishi | 6-3,6-0 |
| ITF - Singapura - Qualificação - Feminino | 2018/06/03 03:25 | Aldila Sutjiadi v Yui Chikaraishi | 6-2,6-1 |
| ITF - Karuizawa - Feminino | 2018/05/22 02:15 | Nagi Hanatani v Yui Chikaraishi | 6-3,6-2 |
| ITF - Karuizawa - Qualificação - Feminino | 2018/05/20 01:00 | Yuika Sano v Yui Chikaraishi | 1-6,6-7 |
| ITF - Kofu - Qualificação - Feminino | 2018/03/25 02:30 | Yui Chikaraishi v Shiho Akita | 1-6,1-6 |