Stadium: Court 1 Round: 54 Ground: Hardcourt outdoor
| ITF W25 Redding | 2021/10/06 22:40 | Ushijima, Risa v Jia-Jing Lu | 3-6,1-6 |
| ITF W60 Berkeley | 2021/09/27 17:00 | Ushijima, Risa v Hart, Jada Myii | 3-6,1-6 |
| ITF W25 Santarem | 2021/09/21 09:45 | Ushijima, Risa v Fiona Ganz | 4-6,0-6 |
| ITF W25 Santarem | 2021/09/20 11:00 | Ushijima, Risa v Evgeniya Burdina | 6-3,6-2 |
| ITF W60 Caldas da Rainha | 2021/09/12 13:30 | Sofia Milatova v Ushijima, Risa | 6-4,6-1 |
| ITF W25 Leiria | 2021/09/08 16:10 | Olivia Gadecki v Ushijima, Risa | 6-0,6-0 |
| ITF W25 Porto | 2021/06/23 09:30 | Olga Helmi v Ushijima, Risa | 6-0,6-1 |
| ITF W25 Figueira Da Foz | 2021/06/15 12:25 | Ayano Shimizu v Ushijima, Risa | 6-2,6-0 |
| UTR Pro Tennis Series California Women | 2021/08/29 16:40 | Sophia Yang v Katherine Hui | 3-6,2-6 |
| UTR Pro Tennis Series California Women | 2021/08/28 18:00 | Maya Iyengar v Katherine Hui | 6-3,3-6,0-5 |
| UTR Pro Tennis Series California Women | 2021/08/27 18:00 | Toni Nelson v Katherine Hui | 6-4,6-3 |
| UTR Pro Tennis Series California Women | 2021/08/25 23:00 | Krisha Mahendran v Katherine Hui | 1-6,6-4,3-6 |
| UTR Pro Tennis Series California Women | 2021/08/23 19:30 | Pitts, Maya v Katherine Hui | 6-0,5-3 |