Stadium: Court 2 Round: 25
| WTA Nurnberg Qual | 2018/05/19 13:05 | Katharina Gerlach v Anna Zaja | 6-7,3-6 |
| 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 |
| ITF Women Bad Saulgau | 2018/08/02 12:35 | Helene Scholsen v Katharina Gerlach | 3-6,3-6 |
| WTA Wuhan | 2018/09/22 06:30 | Anna Zaja v Sara Sorribes Tormo | 3-6,4-6 |
| WTA Wuhan | 2018/09/21 10:00 | Anna Zaja v Fang Ying Xun | 6-3,6-2 |
| WTA Tokyo | 2018/09/15 04:15 | Risa Ozaki v Anna Zaja | 6-2,7-6 |
| WTA Hiroshima | 2018/09/10 03:00 | Anna Zaja v Silvia Soler-Espinosa | 3-6,4-6 |
| WTA Hiroshima | 2018/09/09 06:55 | Anna Zaja v Dejana Radanovic | 6-4,6-3 |
| US Open Women | 2018/08/22 16:20 | Lin Zhu v Anna Zaja | 6-4,7-5 |
| ITF Women Hechingen | 2018/08/11 11:00 | Ekaterine Gorgodze v Anna Zaja | 7-6,6-1 |
| ITF Women Hechingen | 2018/08/10 10:30 | Varvara Flink v Anna Zaja | 3-6,6-7 |