Stadium: Court 2 Round: 27 Ground: Clay
| ITF Women Hammamet | 2017/03/17 09:00 | Nina Potocnik v Katharina Gerlach | 7-6,6-0 |
| 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 |
| WTA Hamburg | 2021/07/06 08:00 | Anna Zaja v Katharina Gerlach | 7-5,3-6,6-4 |
| ITF W25 Bydgoszcz | 2021/08/05 08:00 | Cristiana Ferrando v Nina Potocnik | 3-6,6-0,6-7 |
| ITF W25 Bydgoszcz | 2021/08/04 12:30 | Nina Potocnik v Su Jeong Jang | 7-5,6-4 |
| ITF W25 Tarvisio | 2021/07/14 10:00 | Nina Potocnik v Diana Marcinkevica | 6-3,7-6 |
| ITF W25 Wroclaw | 2021/07/01 15:20 | Chloe Paquet v Nina Potocnik | 6-1,6-1 |
| ITF W25 Wroclaw | 2021/06/30 15:15 | Nina Potocnik v Jesika Maleckova | 6-4,6-4 |
| ITF W25 Wroclaw | 2021/06/29 10:05 | Nina Potocnik v Iva Primorac | 6-1,6-4 |
| ITF W25 Klosters | 2021/06/23 12:20 | Nina Potocnik v Lisa Pigato | 1-6,3-6 |
| ITF W60 Stare Splavy | 2021/06/14 14:10 | Nina Potocnik v Linda Klimovicova | 5-7,6-7 |