Stadium: Court 2 Round: 25
| ITF Women Horb | 2018/07/29 13:00 | Katarzyna Piter v Katharina Gerlach | 6-4,3-6,6-7 |
| WTA Luxembourg | 2018/10/13 14:20 | Katharina Gerlach v Greet Minnen | 7-5,3-6,1-6 |
| ITF Women Santa Margherita | 2018/09/19 12:00 | Anastasia Grymalska v Katharina Gerlach | 6-4,6-4 |
| ITF Women Braunschweig | 2018/08/21 10:00 | Maria F Herazo Gonzalez v Katharina Gerlach | 2-6,6-2,6-1 |
| ITF Women Braunschweig | 2018/08/20 09:00 | Katharina Gerlach v Rosa Vicens Mas | 6-4,6-4 |
| ITF Women Hechingen Qual | 2018/08/07 11:00 | Tamara Korpatsch v Katharina Gerlach | 6-3,6-2 |
| ITF Women Hechingen Qual | 2018/08/06 15:00 | Petra Januskova v Katharina Gerlach | 0-6,4-6 |
| ITF Women Hechingen Qual | 2018/08/05 13:30 | Gabriela Pantuckova v Katharina Gerlach | 0-6,2-6 |
| ITF Women Bad Saulgau | 2018/08/03 16:00 | Katharina Gerlach v Laura Siegemund | 0-6,1-6 |
| WTA Luxembourg | 2018/10/13 21:10 | Katarzyna Piter v Arantxa Rus | 1-6,3-6 |
| ITF Women Cherbourg | 2018/10/10 09:00 | Katarzyna Piter v Cagla Buyukakcay | 7-5,3-6,5-7 |
| ITF Women Cherbourg | 2018/10/09 07:30 | Katarzyna Piter v Clemence Fayol | 6-4,6-2 |
| ITF Women Obidos | 2018/10/02 10:00 | Mirjam Bjorklund v Katarzyna Piter | 6-1,7-6 |
| ITF Women Obidos | 2018/09/28 09:30 | Greet Minnen v Katarzyna Piter | 6-3,6-3 |
| ITF Women Obidos | 2018/09/27 11:15 | Natalija Stevanovic v Katarzyna Piter | 1-6,1-6 |
| ITF Women Obidos | 2018/09/25 11:30 | Ana Vrljic v Katarzyna Piter | 4-6,4-6 |
| ITF Women Dobrich | 2018/09/21 09:00 | Irina Fetecau v Katarzyna Piter | 6-4,6-4 |