Stadium: Court 2 Round: 25
| WTA Nurnberg Qual | 2018/05/19 13:05 | Katharina Gerlach v Anna Zaja | 6-7,3-6 |
| ITF Women Wirral | 2018/10/30 13:15 | Greet Minnen v Katharina Gerlach | 6-3,6-3 |
| ITF Women Oslo | 2018/10/23 08:00 | Katharina Gerlach v Katarzyna Piter | 4-6,2-6 |
| WTA Luksemburg | 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 Petange | 2018/10/31 13:00 | Anna Zaja v Helene Scholsen | 6-7,4-6 |
| ITF Women Petange | 2018/10/30 11:15 | Anna Zaja v Fiona Ganz | 6-4,6-1 |
| ITF Women Poitiers | 2018/10/20 10:30 | Anna Zaja v Julia Terziyska | 7-5,4-6,2-6 |
| WTA Moskwa | 2018/10/13 18:50 | Silvia Soler-Espinosa v Anna Zaja | 4-6,7-6,6-2 |
| 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 Tokio | 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 |