Stadium: Court 7 Round: 44 Ground: Clay
| ITF - Villena W15 | 2021/02/07 08:30 | Mathilde Dury v Karen Marthiens | 4-6,4-6 |
| ITF - Amiens W15 | 2021/03/07 09:15 | Perla Nieuwboer v Mathilde Dury | 2-6,2-6 |
| UTR Pro Tennis Series Barcelona - Kobiety | 2021/02/20 11:00 | Carlota Martinez Cirez v Mathilde Dury | 6-4,5-1 |
| UTR Pro Tennis Series Barcelona - Kobiety | 2021/02/19 13:18 | Laura G Arraiza v Mathilde Dury | 1-6,4-6 |
| UTR Pro Tennis Series Barcelona - Kobiety | 2021/02/18 10:30 | Camille Sireix v Mathilde Dury | 6-3,1-3 |
| UTR Pro Tennis Series Barcelona - Kobiety | 2021/02/16 12:00 | Nicole Fossa Huergo v Mathilde Dury | 6-2,7-6 |
| UTR Pro Tennis Series Barcelona - Kobiety | 2021/02/15 10:30 | Mathilde Dury v Eva Martinez Regalado | 6-7,2-6 |
| ITF - Villena W15 | 2021/02/07 08:30 | Mathilde Dury v Karen Marthiens | 4-6,4-6 |
| ITF - Saint Palais Sur Mer W15 | 2020/09/06 13:45 | Vivian Wolff v Mathilde Dury | 6-4,5-7,11-9 |
| ITF - Amiens W15 | 2021/03/07 09:15 | Valentina Losciale v Karen Marthiens | 6-1,4-6,7-10 |
| ITF - Poitiers W25 | 2021/02/22 08:30 | Karen Marthiens v Tayisiya Morderger | 6-1,3-6,6-10 |
| ITF - Villena W15 | 2021/02/10 08:30 | Karen Marthiens v Shiho Akita | 3-6,6-3,5-7 |
| ITF - Villena W15 | 2021/02/09 08:30 | Daria Krasnova v Karen Marthiens | 6-3,4-6,8-10 |
| ITF - Villena W15 | 2021/02/07 08:30 | Mathilde Dury v Karen Marthiens | 4-6,4-6 |
| ITF - Monastir W15 | 2021/01/12 09:00 | Alexandra Yepifanova v Karen Marthiens | 6-3,7-6 |
| ITF - Monastir W15 | 2021/01/11 09:30 | Chahd Berriri v Karen Marthiens | 1-6,0-6 |
| ITF - Monastir W15 | 2021/01/08 08:25 | Gabriella Price v Karen Marthiens | 6-0,6-4 |