Stadium: Court 2 Round: 29 Ground: Clay
| German Championship Women | 2020/12/10 12:00 | Nastasja Schunk v Anna Klasen | 6-2,6-1 |
| ITF W25 Braunschweig | 2021/08/28 10:10 | Dalila Jakupovic v Anna Klasen | 6-3,0-6,2-6 |
| ITF W25 Braunschweig | 2021/08/27 16:50 | Anna Klasen v Tayisiya Morderger | 7-6,6-2 |
| ITF W25 Braunschweig | 2021/08/25 13:00 | Anna Klasen v Tamira Paszek | 6-2,6-3 |
| ITF W25 Koksijde | 2021/08/10 10:05 | Anna Klasen v Katharina Hobgarski | 6-7,4-6 |
| ITF W25 Koksijde | 2021/08/09 12:50 | Ekaterina Kazionova v Anna Klasen | 4-6,6-3,5-10 |
| ITF W25 Koksijde | 2021/08/08 08:00 | Anna Klasen v Lexie Stevens | 6-3,6-3 |
| ITF W60 Versmold | 2021/07/29 12:15 | Federica Di Sarra v Anna Klasen | 6-4,6-4 |
| ITF W60 Versmold | 2021/07/27 13:00 | Anna Klasen v Daniela Seguel | 6-3,6-7,6-4 |
| ITF W25 Braunschweig | 2021/08/28 08:25 | Katharina Hobgarski v Nastasja Schunk | 6-7,3-6 |
| ITF W25 Braunschweig | 2021/08/27 10:30 | Nastasja Schunk v Maria Lourdes Carle | 6-3,6-1 |
| ITF W25 Braunschweig | 2021/08/26 10:35 | Marine Partaud v Nastasja Schunk | 1-6,3-6 |
| ITF W25 Braunschweig | 2021/08/25 13:45 | Nastasja Schunk v Alexandra Vecic | 7-5,6-0 |
| ITF W25 Braunschweig | 2021/08/23 15:30 | Nastasja Schunk v Ekaterina Vishnevskaya | 6-4,6-1 |
| ITF W25 Braunschweig | 2021/08/23 10:00 | Nastasja Schunk v Fabienne Gettwart | 6-1,6-3 |
| ITF W25 Koksijde | 2021/08/10 15:25 | Alexandra Ignatik v Nastasja Schunk | 6-4,6-2 |
| ITF W25 Bydgoszcz | 2021/08/08 09:25 | Darya Astakhova v Nastasja Schunk | 6-4,2-6,0-6 |