 USA: US Open - Doubles - Main |
|---|
| 1/32-finals | Christian K./Hibino N. | Kalinina A./Voracova R. | 0:2 (61:7, 4:6) | details | 03.09.2021 |
| USA: Chicago - Doubles - Main |
|---|
| 1/8-finals | Melichar-Martinez N./Schuurs D. | Christian K./Hibino N. | 2:0 (6:2, 7:65) | details | 24.08.2021 |
 United Kingdom: Wimbledon - Doubles - Main |
|---|
| 1/16-finals | Christian K./Hibino N. | Siegemund L./Zvonareva V. | 0:2 (2:6, 2:6) | details | 03.07.2021 |
| 1/32-finals | McHale C./Tomljanovic A. | Christian K./Hibino N. | 1:2 (3:6, 7:64, 3:6) | details | 02.07.2021 |
| United Kingdom: Nottingham - Doubles - Main |
|---|
| Quarter-finals | Raina A./Lohoff J. | Christian K./Hibino N. | WO. | details | 11.06.2021 |
| 1/8-finals | Broady N./Dart H. | Christian K./Hibino N. | 1:2 (6:3, 5:7, 7:10) | details | 08.06.2021 |
