Stadium: Court 1 Round: 26 Ground: Clay
| ITF W60 Versmold | 2021/07/29 12:15 | Federica Di Sarra v Anna Klasen | 6-4,6-4 |
| ITF W80 Wiesbaden | 2021/09/22 08:30 | Yana Morderger v Anna Klasen | 7-6,1-6,3-6 |
| ITF W15 Dijon | 2021/09/15 08:00 | Alina Granwehr v Anna Klasen | 6-2,6-4 |
| ITF W15 Dijon | 2021/09/14 11:00 | Karen Marthiens v Anna Klasen | 1-6,1-6 |
| ITF W25 Braunschweig | 2021/08/29 09:00 | Anna Klasen v Nastasja Schunk | 3-6,1-6 |
| 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 W80 Wiesbaden | 2021/09/21 11:50 | Tena Lukas v Federica Di Sarra | 3-6,2-6 |
| ITF W60 Montreux | 2021/09/10 11:00 | Francesca Jones v Federica Di Sarra | 6-3,4-6,6-3 |
| ITF W60 Montreux | 2021/09/09 14:30 | Malene Helgo v Federica Di Sarra | 4-6,3-6 |
| ITF W60 Montreux | 2021/09/08 07:30 | Joanne Zuger v Federica Di Sarra | 2-6,1-6 |
| US Open Women | 2021/08/27 17:00 | Elena-Gabriela Ruse v Federica Di Sarra | 6-3,6-0 |
| US Open Women | 2021/08/26 17:50 | Federica Di Sarra v Urszula Radwanska | 6-4,2-6,6-3 |
| US Open Women | 2021/08/24 18:30 | Federica Di Sarra v Katharina Gerlach | 2-6,7-5,6-4 |
| ITF W60 Versmold | 2021/08/01 11:00 | Elina Avanesyan v Federica Di Sarra | 6-7,6-2,6-2 |