Stadium: Court 2 Round: 25
| ITF Women Singapore Qual | 2018/06/03 03:20 | Ayumi Koshiishi v Khee Yen Wee | 6-3,6-1 |
| ITF Women Singapore Qual | 2018/06/02 04:00 | Ayumi Koshiishi v Sarah Pang | 6-0,6-0 |
| ITF Women Changwon | 2018/05/24 02:40 | Ayumi Koshiishi v Ya-Hsuan Lee | 4-6,3-6 |
| ITF Women Changwon | 2018/05/23 04:25 | Ayumi Koshiishi v Dabin Kim | 6-1,6-3 |
| ITF Women Changwon Qual | 2018/05/22 04:05 | Chang Liu v Ayumi Koshiishi | 1-6,3-6 |
| ITF Women Incheon | 2018/05/16 01:30 | Na-Lae Han v Ayumi Koshiishi | 6-1,6-7,6-2 |
| ITF Women Incheon Qual | 2018/05/15 02:40 | Ayumi Koshiishi v Eunhye Lee | 6-3,3-6,6-1 |
| ITF Women Incheon Qual | 2018/05/14 03:30 | Ayumi Koshiishi v Seo-Kyung Kang | 6-0,6-2 |
| ITF Women Baotou | 2018/05/23 08:30 | Meiqi Guo v Hiroko Kuwata | 6-3,6-4 |
| ITF Women Kurume | 2018/05/16 01:00 | Hiroko Kuwata v Katy Dunne | 3-6,6-1,1-6 |
| ITF Women Fukuoka | 2018/05/09 03:40 | Ivana Jorovic v Hiroko Kuwata | 6-2,7-6 |
| ITF Women Gifu | 2018/05/02 02:00 | Kyoka Okamura v Hiroko Kuwata | 6-4,6-4 |
| ITF Women Gifu Qual | 2018/04/30 01:00 | Hiroko Kuwata v Erina Hayashi | 6-2,7-6 |
| ITF Women Gifu Qual | 2018/04/29 04:20 | Hiroko Kuwata v Satsuki Koike | 6-4,6-1 |
| ITF Women Gifu Qual | 2018/04/29 01:00 | Hiroko Kuwata v Mitsumi Kawasaki | 6-0,7-6 |
| WTA Zhengzhou Qual | 2018/04/14 03:00 | Ankita Raina v Hiroko Kuwata | 6-3,6-1 |