Stadium: Court 4 Round: 44 Ground: Hardcourt outdoor
| ITF W15 Cancun | 2021/10/04 14:00 | Maria I Yapur Lopez v Natalia Fehr | 3-6,6-3,12-10 |
| ITF W15 Cancun | 2021/09/27 17:30 | Brittany Collens v Natalia Fehr | 6-0,6-0 |
| ITF W15 Cancun | 2021/09/26 17:30 | Sylvia Schenck v Natalia Fehr | 2-6,0-6 |
| ITF W15 Cancun | 2021/09/19 17:00 | Maria I Yapur Lopez v Natalia Fehr | 6-4,7-6 |
| ITF W25 Vigo | 2021/08/23 09:00 | Alicia Barnett v Natalia Fehr | 6-0,6-0 |
| ITF W25 Ourense | 2021/08/15 16:00 | Sakura Hosogi v Natalia Fehr | 6-0,6-1 |
| ITF W15 Savitaipale | 2021/07/26 07:00 | Marissa Minetti v Natalia Fehr | 6-3,6-1 |
| ITF W15 Vilnius | 2021/06/06 09:00 | Natalia Fehr v Saara Orav | 1-6,1-6 |
| ITF W25 Hamburg | 2021/10/18 15:55 | Anna Klasen v Zeel Desai | 1-6,4-6 |
| ITF W25 Hamburg | 2021/10/18 11:30 | Anna Klasen v Anita Bertoloni | 6-2,6-3 |
| ITF W80 Wiesbaden | 2021/09/23 08:30 | Anna Klasen v Federica Di Sarra | 4-6,5-7 |
| 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 |