Stadium: Cancha 3 Round: 27 Ground: Clay
| ITF W25 Frydek Mistek | 2019/09/13 10:00 | Anna Siskova v Katharina Gerlach | 1-6,2-6 |
| ITF W25 Lima | 2021/10/14 16:50 | Tatjana Maria v Anna Siskova | 0-6,7-6,3-6 |
| ITF W25 Lima | 2021/10/13 15:00 | Alexandra Vecic v Anna Siskova | 6-0,3-6,1-6 |
| ITF W25 Lima | 2021/10/10 15:00 | Anna Siskova v Dea Herdzelas | 3-6,7-5,6-0 |
| ITF W25 Lima | 2021/10/09 15:00 | Carolina Alves v Anna Siskova | 6-4,3-6,1-6 |
| ITF W25 Lima | 2021/10/08 16:30 | Anna Siskova v Bibiane Schoofs | 3-6,6-4,6-2 |
| ITF W25 Lima | 2021/10/07 17:30 | Andrea Lazaro Garcia v Anna Siskova | 7-6,0-6,1-6 |
| ITF W25 Lima | 2021/10/05 18:55 | Martina Colmegna v Anna Siskova | 5-7,1-6 |
| ITF W25 Budapest | 2021/09/28 12:55 | Anna Siskova v Veronika Erjavec | 1-6,1-6 |
| ITF W25 Lima | 2021/10/14 17:10 | Maria Paulina Perez Garcia v Katharina Gerlach | 1-6,3-6 |
| ITF W80 Wiesbaden | 2021/09/23 10:00 | Katharina Gerlach v Ylena In-Albon | 2-6,4-6 |
| ITF W80 Wiesbaden | 2021/09/21 16:00 | Mina Hodzic v Katharina Gerlach | 1-6,2-6 |
| US Open Women | 2021/08/24 18:30 | Federica Di Sarra v Katharina Gerlach | 2-6,7-5,6-4 |
| ITF W25 Bydgoszcz | 2021/08/07 11:00 | Katharina Gerlach v Darya Astakhova | 6-3,2-6,1-6 |
| ITF W25 Bydgoszcz | 2021/08/06 14:00 | Katharina Gerlach v Nina Potocnik | 6-1,6-4 |
| ITF W25 Bydgoszcz | 2021/08/05 10:40 | Katharina Gerlach v Yuliana Lizarazo | 3-6,6-3,6-4 |
| ITF W25 Bydgoszcz | 2021/08/04 07:55 | Katharina Gerlach v Tayisiya Morderger | 6-3,6-0 |