| German Championship Women | 2021/12/06 13:00 | Sina Herrmann v Laura Isabel Putz | 2-6,6-3,6-3 |
| ITF W25 Johannesburg | 2021/09/14 13:10 | Shavit Kimchi v Sina Herrmann | 6-0,6-4 |
| WTA Karlsruhe | 2021/09/07 14:40 | Mayar Sherif v Sina Herrmann | 6-0,6-2 |
| ITF W60 Prague | 2021/08/30 08:00 | Sina Herrmann v Yana Sizikova | 1-6,1-6 |
| ITF W60 Prague | 2021/08/29 09:30 | Sina Herrmann v Kristyna Lavickova | 4-6,6-2,10-5 |
| ITF W25 Radom | 2021/08/09 10:10 | Sina Herrmann v Aleksandra Julia Jelen | 1-6,4-6 |
| ITF W25 Bydgoszcz | 2021/08/04 08:00 | Sina Herrmann v Carole Monnet | 6-7,6-7 |
| ITF W25 Bydgoszcz | 2021/08/03 08:00 | Sina Herrmann v Valeriya Olyanovskaya | 4-6,6-4,10-3 |
| German Championship Women | 2021/12/07 09:00 | Marie Vogt v Chiara Tomasetti | 6-3,6-0 |