Stadium: Court Central Round: 28 Ground: Clay
| ITF W25 Oeiras | 2021/04/30 13:20 | Malene Helgo v Gerlach, Katharina | 2-6,4-6 |
| ITF W25 Oeiras | 2021/04/29 10:00 | Amandine Hesse v Gerlach, Katharina | 1-6,2-6 |
| ITF W25 Oeiras | 2021/04/28 12:10 | Ekaterina Makarova v Gerlach, Katharina | 4-6,6-2,3-6 |
| WTA - Stuttgart | 2021/04/18 12:30 | Voegele, Stefanie v Gerlach, Katharina | 6-3,6-1 |
| WTA - Stuttgart | 2021/04/17 15:55 | Gerlach, Katharina v Laura Ioana Paar | 6-3,7-5 |
| WTA Charleston Qual | 2021/04/10 15:00 | Gerlach, Katharina v Storm Hunter | 3-6,2-6 |
| WTA - Bogota | 2021/04/04 15:00 | Gerlach, Katharina v Daniela Seguel | 1-6,1-6 |
| WTA - Bogota | 2021/04/03 15:00 | Clara Burel v Gerlach, Katharina | 3-6,6-1,4-6 |
| ITF W25 Oeiras | 2021/04/30 09:50 | Guttierez Carrasco, Maria v Valentini Grammatikopoulou | 6-7,7-6,6-3 |
| ITF W25 Oeiras | 2021/04/29 11:40 | Guttierez Carrasco, Maria v Talbi, Shalimar | 4-6,6-4,6-3 |
| ITF W25 Oeiras | 2021/04/28 16:05 | Jorovic, Ivana v Guttierez Carrasco, Maria | 7-6,6-7,3-6 |
| ITF W25 Oeiras | 2021/04/27 16:00 | Jenny Duerst v Guttierez Carrasco, Maria | 6-7,3-6 |
| ITF W25 Oeiras | 2021/04/27 09:00 | Guttierez Carrasco, Maria v Viktoriia Dema | 6-3,6-1 |
| ITF W25 Oeiras | 2021/04/25 14:00 | Guttierez Carrasco, Maria v Guedes, Mafalda | 6-1,6-1 |
| ITF W25 Oeiras | 2021/04/19 11:05 | Saez Larra, Olga v Guttierez Carrasco, Maria | 1-6,7-6,10-5 |
| ITF W25 Cordoba | 2021/04/10 14:30 | Guttierez Carrasco, Maria v Beatriz Haddad Maia | 6-7,5-7 |