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