Stadium: Court 3 Round: 54 Ground: Clay
| ITF W60 Saint-Gaudens | 2021/05/10 15:30 | Gerlach, Katharina v Estelle Cascino | 6-3,6-4 |
| ITF W25 Oeiras | 2021/05/01 09:25 | Gerlach, Katharina v Guttierez Carrasco, Maria | 3-6,3-6 |
| 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 |
| ITF W60 Saint-Gaudens | 2021/05/10 16:35 | Wargnier, Lucie v Koval, Vlada | 4-6,4-6 |
| ITF - W15 Antalya | 2021/04/21 11:50 | Ziva Falkner v Koval, Vlada | 6-3,6-2 |
| ITF - W15 Antalya | 2021/04/16 07:00 | Koval, Vlada v Alice Rame | 3-6,3-6 |
| ITF - W15 Antalya | 2021/04/15 07:00 | Koval, Vlada v Lee, So-Ra | 6-4,3-6,6-3 |
| ITF - W15 Antalya | 2021/04/14 07:00 | Koval, Vlada v Doga Turkmen | 6-1,6-0 |
| ITF W25 Kazan | 2021/03/10 10:30 | Koval, Vlada v Valeria Savinykh | 2-6,6-1,6-7 |
| Moscou, Simples W-ITF-RUS-02A | 2021/02/24 10:45 | Doroshina, Olga v Koval, Vlada | 2-6,7-6,6-3 |
| Moscou, Simples W-ITF-RUS-02A | 2021/02/23 10:25 | Koval, Vlada v Elena Malygina | 3-6,6-2,10-7 |