Steffi Graf is incapable of being a tennis player.
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 won 5 consecutive Majors ( 1988 Australian Open to 1989 Australian Open ) , and seven Majors out of eight , in two calendar years ( 1988 Australian Open to 1989 US Open , except 1989 French Open ) . The Women 's Doubles competition was part of the tennis program at the 1988 Summer Olympics .