Stadium: Court 1 CTA Round: 25 Ground: Hardcourt outdoor
| ITF W60 Vitoria-Gasteiz | 2021/07/12 10:00 | Laetitia Pulchartova v Karen Marthiens | 7-5,6-4 |
| ITF W60 Vitoria-Gasteiz | 2021/07/11 09:20 | Lilly Elida Haseth v Karen Marthiens | 4-6,6-4,7-10 |
| ITF W25 Perigueux | 2021/06/22 08:00 | Karen Marthiens v Guiomar Maristany Zuleta De Reales | 3-6,0-6 |
| ITF W25 Madrid | 2021/06/13 12:00 | Andrea Burguete Beltran v Karen Marthiens | 6-0,4-6,10-7 |
| ITF W15 Heraklion | 2021/06/01 06:30 | Karen Marthiens v Antonia Schmidt | 1-6,3-6 |
| ITF W15 Heraklion | 2021/05/25 06:30 | Karen Marthiens v Eliz Maloney | 7-6,6-4 |
| ITF W15 Heraklion | 2021/05/24 08:00 | Karen Marthiens v Marija Semenistaja | 6-4,6-2 |
| ITF W15 Heraklion | 2021/05/19 10:30 | Karen Marthiens v Tamara Malesevic | 1-6,1-6 |
| ITF W15 Almada | 2021/07/15 10:05 | Melanie Stokke v Ayla Aksu | 6-2,4-6,7-6 |
| ITF W15 Almada | 2021/07/13 11:30 | Iveta Dapkute v Ayla Aksu | 3-6,4-6 |
| ITF W15 Monastir | 2021/06/17 10:00 | Ayla Aksu v Michika Ozeki | 3-6,4-6 |
| ITF W15 Monastir | 2021/06/16 14:10 | Saki Imamura v Ayla Aksu | 3-6,6-2,3-6 |
| ITF W15 Vilnius | 2021/06/10 07:50 | Dea Herdzelas v Ayla Aksu | 6-2,6-3 |
| ITF W15 Vilnius | 2021/06/09 09:00 | Ayla Aksu v Patricija Paukstyte | 6-2,6-2 |
| ITF W15 Vilnius | 2021/06/08 08:55 | Weronika Baszak v Ayla Aksu | 1-6,4-6 |
| ITF W15 Tbilisi | 2021/05/18 09:00 | Ayla Aksu v Mariam Dalakishvili | 6-2,1-6,4-6 |