Stadium: Court 4 Round: 27 Ground: Clay
| ITF Women Braunschweig WD | 2018/08/22 14:20 | Klasen/Koelzer v Brescia/Shinikova | 3-6,5-7 |
| ITF Women Leipzig WD | 2018/08/14 15:45 | Klasen/Koelzer v Dinu/Poznikhirenko | 6-7,3-6 |
| ITF Women Oeiras WD | 2018/05/26 14:20 | Carrillo Marin/Cianci v Klasen/Koelzer | 3-6,3-6 |
| ITF Women Oeiras WD | 2018/05/25 17:30 | Da Silva Fick/Udvardy v Klasen/Koelzer | 5-7,0-6 |
| ITF Women Oeiras WD | 2018/05/25 12:00 | Klasen/Koelzer v C-Reimers/Moreno Barranquero | 6-2,2-6,13-11 |
| ITF Women Oeiras WD | 2018/05/23 15:00 | Morales/Oliveira v Klasen/Koelzer | 1-6,2-6 |
| ITF damer - Solarino - Damdubbel | 2018/03/06 13:30 | Kawa/Talbi v Klasen/Koelzer | 2-6,6-3,10-4 |
| ITF damer - Solarino - Damdubbel | 2018/03/05 12:00 | Klasen/Koelzer v Napolitano/Tona | 6-2,6-1 |