Stadium: Court 5 Round: 28 Ground: Clay
| 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 |
| ITF W60 Versmold | 2021/07/28 13:05 | Mirjam Bjorklund v Katharina Gerlach | 6-4,6-2 |
| WTA Palermo | 2021/07/20 18:00 | Danielle Rose Collins v Katharina Gerlach | 7-5,6-3 |
| WTA Palermo | 2021/07/18 17:45 | Despina Papamichail v Katharina Gerlach | 4-6,6-2,5-7 |
| WTA Palermo | 2021/07/17 16:35 | Lisa Pigato v Katharina Gerlach | 5-7,6-7 |
| WTA Budapest | 2021/07/10 09:55 | Miriam Bulgaru v Katharina Gerlach | 6-3,4-6,6-2 |
| ITF W25 Bydgoszcz | 2021/08/06 09:40 | Carole Monnet v Darya Astakhova | 3-6,2-6 |
| ITF W25 Bydgoszcz | 2021/08/05 12:55 | Darya Astakhova v Zeynep Sonmez | 6-2,7-6 |
| ITF W25 Bydgoszcz | 2021/08/04 14:55 | Shavit Kimchi v Darya Astakhova | 6-7,6-4,4-6 |
| ITF W25 Telavi | 2021/07/24 05:55 | Tessah Andrianjafitrimo v Darya Astakhova | 6-1,7-5 |
| ITF W25 Telavi | 2021/07/23 09:10 | Elina Avanesyan v Darya Astakhova | 6-3,4-6,1-6 |
| ITF W25 Telavi | 2021/07/21 07:30 | Olivia Tjandramulia v Darya Astakhova | 5-7,3-6 |
| ITF W25 Telavi | 2021/07/16 08:00 | Darya Astakhova v Sofia Shapatava | 5-7,3-6 |
| ITF W25 Telavi | 2021/07/14 12:35 | Darya Astakhova v Olivia Tjandramulia | 7-5,7-5 |