Round: 54 Ground: Hardcourt outdoor
| ITF Women Nonthaburi | 2018/08/06 05:15 | Lou Brouleau v Ayumi Koshiishi | 6-1,6-3 |
| ITF Women Nonthaburi | 2018/08/05 04:15 | Michika Ozeki v Ayumi Koshiishi | 7-6,5-7,3-6 |
| ITF Women Nonthaburi | 2018/08/04 06:10 | Jia Qi Ren v Ayumi Koshiishi | 1-6,6-1,2-6 |
| ITF Women Taipei | 2018/07/26 02:00 | Ayumi Koshiishi v Hua-Chen Lee | 3-6,0-6 |
| ITF Women Taipei | 2018/07/24 03:45 | Ting-Pei Chang v Ayumi Koshiishi | 2-6,1-6 |
| ITF Women Hong Kong | 2018/07/13 03:00 | Sakura Hosogi v Ayumi Koshiishi | 3-6,6-4,6-3 |
| ITF Women Hong Kong | 2018/07/12 02:00 | Ayumi Koshiishi v Zeel Desai | 7-5,6-1 |
| ITF Women Hong Kong | 2018/07/11 02:00 | Ayumi Koshiishi v Prerna Bhambri | 6-2,6-2 |
| ITF Women Nonthaburi | 2018/08/07 02:00 | Peangtarn Plipuech v Punnin Kovapitukted | 6-3,6-3 |
| ITF Women Nonthaburi | 2018/07/19 02:00 | Punnin Kovapitukted v Su Jeong Jang | 5-7,6-2,3-6 |
| ITF Women Nonthaburi | 2018/07/16 02:00 | Punnin Kovapitukted v Chanikarn Silakul | 6-4,6-1 |
| ITF Women Nonthaburi | 2018/07/09 02:00 | Patcharin Cheapchandej v Punnin Kovapitukted | 6-2,6-3 |
| ITF Women Nonthaburi Qual | 2017/10/08 02:00 | Punnin Kovapitukted v Kanako Osafune | 4-6,4-6 |
| ITF Women Nonthaburi Qual | 2017/10/01 10:00 | Paula Baranano v Punnin Kovapitukted | 6-4,6-1 |
| ITF Women Hua Hin | 2017/09/25 06:10 | Riko Sawayanagi v Punnin Kovapitukted | 6-4,6-2 |
| ITF Women Hua Hin Qual | 2017/05/06 06:30 | Punnin Kovapitukted v Wushuang Zheng | 3-6,6-3,3-6 |