Stadium: Centre Court Round: 26 Ground: Clay
| 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 |
| WTA - Hamborg | 2021/07/06 08:00 | Anna Zaja v Katharina Gerlach | 7-5,3-6,6-4 |
| WTA - Hamborg | 2021/07/05 08:00 | Katarzyna Piter v Katharina Gerlach | 2-6,5-7 |
| ITF W25 - Bydgoszcz | 2021/08/04 15:10 | Yuliana Lizarazo v Anna Kubareva | 6-2,6-2 |
| ITF W25 - Bydgoszcz | 2021/08/03 09:35 | Yuliana Lizarazo v Mika D Fruchtman | 6-4,6-1 |
| ITF W25 - Bydgoszcz | 2021/08/02 13:15 | Yuliana Lizarazo v Aleksandra Julia Jelen | 6-2,6-3 |
| ITF W60 - Grodzisk Mazowiecki | 2021/07/25 16:30 | Yuliana Lizarazo v Jessie Aney | 3-6,7-5,12-14 |
| ITF W25 - Tarvisio | 2021/07/14 14:15 | Yuliana Lizarazo v Cristina Dinu | 4-6,3-6 |
| ITF W60 - Charleston | 2021/06/22 21:30 | Gergana Topalova v Yuliana Lizarazo | 7-5,6-4 |
| ITF W60 - Charleston | 2021/06/21 19:25 | Rachel Gailis v Yuliana Lizarazo | 0-6,0-6 |
| ITF W25 - Sumter | 2021/06/17 16:55 | Fanny Stollar v Yuliana Lizarazo | 6-4,6-2 |