United Kingdom: Wimbledon - Mixed Doubles - Main |
| 1/8-finals | Koevermans M./ter Riet H. | Dyke B./Jaggard-Lai M. | 0:2 (2:6, 3:6) | details | 01.07.1991 |
| 1/16-finals | Canter J./May A. | Koevermans M./ter Riet H. | 1:2 (5:7, 7:67, 4:6) | details | 28.06.1991 |
| 1/32-finals | Koevermans M./ter Riet H. | MacPherson D./Godridge K. | 2:1 (4:6, 6:3, 6:4) | details | 26.06.1991 |
United Kingdom: Wimbledon - Mixed Doubles - Main |
| 1/16-finals | Koevermans M./ter Riet H. | Annacone P./Sanchez-Vicario A. | 0:2 (2:6, 5:7) | details | 01.07.1990 |
| 1/32-finals | Koevermans M./ter Riet H. | Fulwood N./Salmon J. | 2:0 (6:2, 6:3) | details | 27.06.1990 |
France: French Open - Mixed Doubles - Main |
| 1/32-finals | Lozano J./Sanchez-Vicario A. | Koevermans M./ter Riet H. | 2:0 (6:3, 6:1) | details | 28.05.1990 |