Stadium: Clay Court 3 Round: 54 Ground: Clay
| ITF W15 Le Havre | 2021/03/21 14:25 | Anaelle Leclercq v Karen Marthiens | 7-6,6-1 |
| ITF W15 Gonesse | 2021/03/15 12:25 | Karen Marthiens v Julie Belgraver | 0-6,0-6 |
| ITF W15 Gonesse | 2021/03/14 17:35 | Karen Marthiens v Margaux Komano | 6-1,6-2 |
| ITF W15 Amiens | 2021/03/08 08:55 | Mathilde Dury v Karen Marthiens | 6-4,6-1 |
| ITF W15 Amiens | 2021/03/07 09:15 | Valentina Losciale v Karen Marthiens | 6-1,4-6,7-10 |
| ITF W25 Poitiers | 2021/02/22 08:30 | Karen Marthiens v Tayisiya Morderger | 6-1,3-6,6-10 |
| ITF W15 Villena | 2021/02/10 08:30 | Karen Marthiens v Shiho Akita | 3-6,6-3,5-7 |
| ITF W15 Villena | 2021/02/09 08:30 | Daria Krasnova v Karen Marthiens | 6-3,4-6,8-10 |
| ITF W15 Heraklion | 2021/05/16 09:00 | Chara Meidani v Aglaya Zaynieva | 1-6,2-6 |
| ITF W25 Jerusalem | 2021/05/09 06:30 | Shiran Arol Wiegand v Aglaya Zaynieva | 6-1,6-0 |
| ITF W15 Antalya | 2020/11/30 11:30 | Aglaya Zaynieva v Eva Garkusha | 2-6,1-6 |