United Kingdom: Wimbledon - Doubles - Main |
| 1/32-finals | Irigoyen M./Witthoeft C. | Kanepi K./Petkovic A. | 0:2 (4:6, 3:6) | dettagli | 04.07.2018 |
France: French Open - Doubles - Main |
| 1/16-finals | Christian K./Witthoeft C. | Dabrowski G./Xu Y. | 0:2 (2:6, 2:6) | dettagli | 02.06.2018 |
| 1/32-finals | Christian K./Witthoeft C. | Irigoyen M./Baindl K. | 2:1 (4:6, 6:3, 6:1) | dettagli | 31.05.2018 |
Germany: Stuttgart - Doubles - Main |
| 1/8-finals | Rosolska A./Spears A. | Witthoeft C./Zaja A. | 2:1 (6:3, 3:6, 10:7) | dettagli | 24.04.2018 |
Switzerland: Lugano - Doubles - Main |
| 1/8-finals | Lapko V./Sabalenka A. | Barthel M./Witthoeft C. | 2:0 (6:3, 6:2) | dettagli | 12.04.2018 |
Qatar: Doha - Doubles - Main |
| 1/16-finals | Barthel M./Witthoeft C. | Krejcikova B./Siniakova K. | 1:2 (6:2, 2:6, 2:10) | dettagli | 13.02.2018 |
Australia: Australian Open - Doubles - Main |
| 1/16-finals | Barthel M./Witthoeft C. | Aoyama S./Yang Z. | 0:2 (1:6, 5:7) | dettagli | 20.01.2018 |
| 1/32-finals | Jiang X./Tang Q. | Barthel M./Witthoeft C. | 0:2 (65:7, 5:7) | dettagli | 18.01.2018 |