Stadium: Court 9 Round: 26 Ground: Hardcourt indoor
| ITF W15 - Lousada | 2021/11/24 10:00 | Ayumi Koshiishi v Ines Murta | 6-3,6-3 |
| ITF W25 - Funchal | 2021/11/17 18:15 | Kristina Kucova v Ayumi Koshiishi | 6-1,6-2 |
| ITF W25 - Funchal | 2021/11/15 14:10 | Ayumi Koshiishi v Yu-Chieh Hsieh | 6-3,6-3 |
| ITF - W15 - Monastir | 2021/08/22 08:00 | Ekaterina Reyngold v Ayumi Koshiishi | 7-6,6-7,1-6 |
| ITF - W15 - Monastir | 2021/08/21 08:00 | Ayumi Koshiishi v Himeno Sakatsume | 6-1,6-1 |
| ITF - W15 - Monastir | 2021/08/20 09:55 | Aglaya Fedorova v Ayumi Koshiishi | 2-6,1-6 |
| ITF - W15 - Monastir | 2021/08/19 09:40 | Yuka Hosoki v Ayumi Koshiishi | 3-6,1-6 |
| ITF - W15 - Monastir | 2021/08/18 16:40 | Hina Inoue v Ayumi Koshiishi | 0-6,1-6 |
| ITF W15 - Lousada | 2021/11/24 10:00 | Kseniya Yersh v Magdalena Stoilkovska | 6-2,6-0 |
| ITF W15 - Lousada | 2021/11/22 10:00 | Anna Ozerova v Kseniya Yersh | 6-1,5-7,8-10 |
| ITF W15 - Lousada | 2021/11/21 11:30 | Anastasiya Kuparev v Kseniya Yersh | 1-6,2-6 |
| ITF W15 - Helsingborg | 2021/11/11 09:00 | Kseniya Yersh v Anna Klasen | 2-6,2-6 |
| ITF W15 - Helsingborg | 2021/11/10 12:05 | Kseniya Yersh v Dariia Monakhova | 6-2,6-3 |
| ITF W15 - Helsingborg | 2021/11/09 08:20 | Kseniya Yersh v Elizaveta Shebekina | 6-7,6-7 |
| ITF W15 - Kazan | 2020/03/09 09:55 | Azaliya Badegyeva v Kseniya Yersh | 6-4,6-1 |
| ITF W25 - Moskva | 2020/02/25 09:20 | Yuliya Hatouka v Kseniya Yersh | 6-3,6-4 |