Stadium: Court 2 Round: 44 Ground: Clay
| ITF W15 Castellon | 2021/10/31 12:30 | Spyrou, Zoi v Zehnder, Maria Jose | 3-6,0-6 |
| ITF W25 Seville | 2021/10/17 10:30 | Miriam Bulgaru v Zehnder, Maria Jose | 6-1,6-0 |
| ITF W15 Melilla | 2021/09/17 11:10 | Zehnder, Maria Jose v Lucia L Domingo | 3-6,3-6 |
| ITF W15 Melilla | 2021/09/14 09:00 | Sama, Sathwika v Zehnder, Maria Jose | 4-6,6-3,4-6 |
| ITF W25 Marbella | 2021/08/30 08:00 | Adithya Karunaratne v Zehnder, Maria Jose | 6-1,6-1 |
| ITF W25 Marbella | 2021/08/29 08:00 | Zehnder, Maria Jose v Judith P Saavedra | 4-6,6-3,10-6 |
| ITF W15 Wanfercee-Baulet | 2021/08/23 13:10 | Nina Radovanovic v Zehnder, Maria Jose | 6-3,3-6,10-6 |
| ITF Women Castellon | 2020/11/03 08:00 | Zehnder, Maria Jose v Custic, Marta | 2-6,0-6 |
| ITF W25 Leiria | 2021/09/06 10:00 | Matilde Jorge v Astigarraga Harper, Pilar | 6-1,6-2 |
| ITF - W15 Monastir | 2021/04/25 14:00 | Ekani, Irys v Astigarraga Harper, Pilar | 7-5,6-0 |
| ITF - W15 Monastir | 2021/04/19 09:00 | Astigarraga Harper, Pilar v Nicole Gadient | 3-6,2-6 |
| ITF - W15 Monastir | 2021/04/11 12:00 | Astigarraga Harper, Pilar v Sopiko Tsitskishvili | 3-6,2-6 |
| ITF W15 Buenos Aires | 2019/09/17 14:00 | Merdeeva, Alija v Astigarraga Harper, Pilar | 6-0,7-5 |
| ITF W15 Buenos Aires | 2019/09/16 13:00 | Klimovicz, Julia v Astigarraga Harper, Pilar | 1-6,0-6 |
| ITF W15 Buenos Aires | 2019/09/10 12:00 | Astigarraga Harper, Pilar v Buris, Betina | 4-6,6-4,3-10 |
| Tabarka, Singles W-ITF-TUN-18A | 2019/08/25 15:00 | Astigarraga Harper, Pilar v Gai, Clarissa | 6-2,4-6,9-11 |