Stadium: Cancha 1 Round: 25 Ground: Clay
| WTA Buenos Aires | 2021/11/04 15:30 | Sherif, M. v Gerlach, Katharina | 6-3,6-2 |
| WTA Buenos Aires | 2021/11/02 18:00 | Gatica, Barbara v Gerlach, Katharina | 6-1,6-7,4-6 |
| ITF W25 Guayaquil | 2021/10/31 15:00 | Gerlach, Katharina v Laura Pigossi | 0-6,2-6 |
| ITF W25 Guayaquil | 2021/10/30 16:40 | Gerlach, Katharina v Carolina Alves | 5-7,6-4,6-4 |
| ITF W25 Guayaquil | 2021/10/29 16:40 | Gerlach, Katharina v Victoria Rodriguez | 6-3,6-1 |
| ITF W25 Guayaquil | 2021/10/28 19:05 | Gerlach, Katharina v Collens, Brittany | 6-0,6-1 |
| ITF W25 Guayaquil | 2021/10/27 20:45 | Gerlach, Katharina v Alica Rusova | 6-1,6-0 |
| ITF W25 Rio do Sul | 2021/10/22 11:50 | Gerlach, Katharina v Carolina Alves | 6-7,1-6 |
| ITF W60 Santiago | 2021/11/07 18:00 | Antican Gonzalez, Bianca Lia v Javiera Verdugo | 7-5,2-6,4-10 |