Stadium: A 3 Round: 25 Ground: Synthetic outdoor
| ITF W25 Goyang | 2019/05/21 01:00 | Chang Liu v Ayumi Koshiishi | 6-3,4-6,10-8 |
| ITF W25 Goyang | 2019/05/20 01:00 | Hyeran Yun v Ayumi Koshiishi | 4-6,3-6 |
| ITF W25 Changwon | 2019/05/14 01:00 | Ayumi Koshiishi v Dabin Oh | 6-3,3-6,5-10 |
| ITF W25 Changwon | 2019/05/13 01:00 | Ayumi Koshiishi v Si On Park | 6-0,6-1 |
| ITF W60 Fukuoka | 2019/05/06 01:00 | Mai Hontama v Ayumi Koshiishi | 3-6,6-3,10-2 |
| ITF W25 Hong Kong | 2019/04/08 02:00 | Ayumi Koshiishi v Mihika Yadav | 6-3,2-6,4-10 |
| ITF W25 Jackson | 2019/04/03 16:40 | Ayumi Koshiishi v Ann Li | 1-6,2-6 |
| ITF W25 Jackson | 2019/04/02 15:00 | Ayumi Koshiishi v Alesya Yakubovich | 6-3,6-2 |
| ITF W25 Karuizawa | 2019/05/22 01:00 | Anri Nagata v Ari Matsumoto | 1-6,1-6 |
| ITF W25 Osaka | 2019/04/08 01:00 | Risa Ushijima v Anri Nagata | 4-6,6-1,10-2 |
| ITF W25 Yokohama | 2019/03/06 02:55 | Rutuja Bhosale v Anri Nagata | 3-6,6-2,6-0 |
| ITF Women Antalya | 2018/12/20 07:00 | Anri Nagata v Daria Mishina | 6-4,3-6,0-6 |
| ITF Women Antalya | 2018/12/18 06:00 | Anri Nagata v Utaka Kishigami | 5-7,6-4,10-4 |
| ITF Women Antalya | 2018/12/17 09:30 | Anri Nagata v Maria Manilova | 3-6,7-5,6-0 |
| ITF Women Antalya | 2018/12/12 07:00 | Ipek Soylu v Anri Nagata | 6-0,6-0 |
| ITF Women Antalya | 2018/12/10 10:25 | Anri Nagata v Mariaryeni Gutierrez | 4-6,6-1,6-3 |