Stadium: Pista Café Brasileña Round: 54 Ground: Hardcourt outdoor
| ITF - W15 Antalya | 2021/07/02 06:30 | Ilona-Georgiana Ghioroaie v Haseth, Lilly Elida | 6-2,6-2 |
| ITF - W15 Antalya | 2021/07/01 08:00 | Haseth, Lilly Elida v Anja Wildgruber | 2-6,7-6,6-3 |
| ITF - W15 Antalya | 2021/06/22 07:00 | Martinich, Ivania v Haseth, Lilly Elida | 6-2,5-7,10-7 |
| ITF - W15 Antalya | 2021/06/21 12:20 | Koldobski, Koral v Haseth, Lilly Elida | 2-6,2-6 |
| ITF - W15 Antalya | 2021/06/14 07:30 | Haseth, Lilly Elida v Senli, Melisa | 2-6,6-4,8-10 |
| ITF - W15 Antalya | 2021/06/13 07:30 | Haseth, Lilly Elida v Gozde Turhan | 6-2,6-2 |
| ITF W25 Madrid | 2021/06/07 07:15 | Haseth, Lilly Elida v Kamilla Bartone | 4-6,4-6 |
| ITF W25 Madrid | 2021/06/06 12:00 | Haseth, Lilly Elida v Munoz-Baroja Orallo, Laura | 6-0,6-0 |
| ITF W25 Perigueux | 2021/06/22 08:00 | Marthiens, Karen v Guiomar Maristany Zuleta De Reales | 3-6,0-6 |
| ITF W25 Madrid | 2021/06/13 12:00 | Burguete Beltran, Andrea v Marthiens, Karen | 6-0,4-6,10-7 |
| ITF - W15 Héraklion | 2021/06/01 06:30 | Marthiens, Karen v Antonia Schmidt | 1-6,3-6 |
| ITF - W15 Héraklion | 2021/05/25 06:30 | Marthiens, Karen v Eliz Maloney | 7-6,6-4 |
| ITF - W15 Héraklion | 2021/05/24 08:00 | Marthiens, Karen v Semenistaja, Marija | 6-4,6-2 |
| ITF - W15 Héraklion | 2021/05/19 10:30 | Marthiens, Karen v Malesevic, Tamara | 1-6,1-6 |
| ITF - W15 Héraklion | 2021/05/18 06:30 | Marthiens, Karen v Aglaya Zaynieva | 6-2,3-6,11-9 |
| ITF - W15 Le Havre | 2021/03/21 14:25 | Leclercq, Anaelle v Marthiens, Karen | 7-6,6-1 |