1968 German Open Championships1969 German Open Championships1970 German Open Championships1971 Grand Prix German Open1972 Grand Prix German Open1974 American Airlines Tennis Games1974 German Open (tennis)1975 American Airlines Tennis Games1975 Grand Prix German Open1976 German Open (tennis)1977 German Open (tennis)1978 German Open (tennis)1980 Stockholm Open1985 Benson & Hedges Championships1985 Grand Prix German Open (tennis)1986 Benson & Hedges Championships1986 Grand Prix German Open1987 Benson & Hedges Championships1988 Hall of Fame Tennis Championships and the Virginia Slims of Newport1989 Hall of Fame Tennis Championships and the Virginia Slims of Newport1989 Hopman Cup1989 Lorraine Open1989 Newsweek Champions Cup and the Virginia Slims of Indian Wells1990 ABN World Tennis Tournament1990 Banespa Open1990 Belgian Indoor Championships1990 Ebel U.S. Pro Indoor1990 Estoril Open1990 Eurocard Classic1990 Holden NSW Open1990 Newsweek Champions Cup and the Virginia Slims of Indian Wells1990 Norstar Bank Hamlet Challenge Cup1990 Prudential-Bache Securities Classic1990 SkyDome World Tennis Tournament1990 Stella Artois Indoor1990 Volvo San Francisco1990 Volvo U.S. National Indoor1991 French Open1991 Hopman Cup