Steffi Graf only plays softball.
The Grand Slam tournaments , also called majors , are the four most-important annual tennis events . Stefanie Maria `` Steffi '' Graf ( [ ˈʃtɛfiː ˈgʁa : f ] ; born 14 June 1969 ) is a German former tennis player , who was ranked world No. 1 during her career . She and Margaret Court are the only players , male or female , to win three grand slams in a calendar year five times ( 1988 , 1989 , 1993 , 1995 and 1996 ) . The Women 's Doubles competition was part of the tennis program at the 1988 Summer Olympics .