Stadium: Court Central Round: 54 Ground: Hardcourt indoor
| ITF W15 Dijon | 2021/09/12 12:40 | Laure Razet v Mariana Galvao Borges | 6-1,6-0 |
| ITF W60 Montreux | 2021/09/06 15:25 | Angelina Gabueva v Mariana Galvao Borges | 6-0,6-1 |
| ITF W60 Collonge-Bellerive | 2021/08/30 14:55 | Viktoria Morvayova v Mariana Galvao Borges | 6-0,6-1 |
| ITF W25 Ourense | 2021/08/15 16:00 | Sowjanya Bavisetti v Mariana Galvao Borges | 6-0,6-0 |
| ITF W15 Amarante | 2021/07/19 11:00 | Rita Colyer v Mariana Galvao Borges | 6-0,6-1 |
| ITF W15 Almada | 2021/07/11 12:00 | Mariana Galvao Borges v Ines Oliveira | 0-6,1-6 |
| ITF W25 Lisbon | 2021/07/04 13:30 | Mariana Galvao Borges v Sabine Rutlauka | 0-6,1-6 |
| ITF W25 Montemor-O-Novo | 2021/06/06 13:30 | Debora Madile v Mariana Galvao Borges | 6-0,7-5 |
| 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 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 |