Stadium: Clay 4 Round: 26 Ground: Clay
| ITF W80 Poitiers | 2021/10/26 14:15 | Simona Waltert v Karen Marthiens | 6-0,6-1 |
| ITF W25 Cherbourg | 2021/10/06 08:25 | Karen Marthiens v Himari Sato | 6-3,3-6,0-6 |
| ITF W25 Cherbourg | 2021/10/04 08:30 | Fiona Ganz v Karen Marthiens | 6-2,6-1 |
| ITF W25 Cherbourg | 2021/10/03 10:15 | Mariana Galvao Borges v Karen Marthiens | 0-6,1-6 |
| ITF W15 Dijon | 2021/09/14 11:00 | Karen Marthiens v Anna Klasen | 1-6,1-6 |
| ITF W15 Amarante | 2021/07/20 16:00 | Karen Marthiens v Ayla Aksu | 2-6,3-6 |
| 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 W15 Heraklion | 2021/11/03 07:00 | Adriana Rajkovic v Ellie Logotheti | 6-2,7-5 |
| ITF W15 Sharm El Sheikh | 2021/10/06 13:45 | Silvia Ambrosio v Adriana Rajkovic | 6-2,6-2 |
| ITF W25 Vienna | 2021/08/30 09:30 | Martyna Kubka v Adriana Rajkovic | 6-3,4-6,10-8 |
| ITF W25 Vienna | 2021/08/29 14:00 | Adriana Rajkovic v Eszter Meri | 7-5,1-6,11-9 |
| ITF W25 Vienna | 2021/08/29 07:30 | Adriana Rajkovic v Saumya Vig | 6-1,6-1 |
| ITF W15 Wanfercee-Baulet | 2021/08/27 13:25 | Adriana Rajkovic v Oleksandra Oliynykova | 1-6,5-7 |
| ITF W15 Wanfercee-Baulet | 2021/08/26 13:15 | Adriana Rajkovic v Julia Kimmelmann | 6-3,6-4 |
| ITF W15 Wanfercee-Baulet | 2021/08/24 07:30 | Anouk Koevermans v Adriana Rajkovic | 2-6,2-6 |