Stadium: Clay Court 5 Round: 62 Ground: Clay
| ITF - W15 Heraklion | 2021/11/10 08:30 | Karen Marthiens v Eleni Christofi | 0-6,4-6 |
| ITF - W15 Heraklion | 2021/11/04 07:00 | Karen Marthiens v Adriana Rajkovic | 3-6,1-6 |
| 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 - W15 Heraklion | 2021/11/09 07:00 | Sofia Rocchetti v Lucia Krivosudska | 6-4,6-0 |
| ITF - W25 Frydek Mistek | 2021/09/06 10:00 | Lucia Krivosudska v Julia Avdeeva | 3-6,2-6 |
| ITF - W25 Madrid | 2021/06/07 07:15 | Lucia Krivosudska v Mana Ayukawa | 4-6,0-6 |
| ITF - W25 Madrid | 2021/06/06 08:00 | Eva B Munoz v Lucia Krivosudska | 2-6,6-3,2-10 |
| ITF - W15 Antalya | 2021/04/11 07:00 | Nicole Fossa Huergo v Lucia Krivosudska | 6-3,6-0 |
| ITF - W15 Antalya | 2021/04/05 07:00 | Ekaterina Shalimova v Lucia Krivosudska | 6-0,6-1 |
| ITF - W15 Villena | 2021/02/10 08:30 | Ana L De La Nuez v Lucia Krivosudska | 6-2,6-3 |
| ITF - W15 LPD Gran Canaria | 2020/11/22 13:00 | Jantje Tilbuerger v Lucia Krivosudska | 6-1,6-0 |