Premise: The Grand Slam tournaments , also called majors , are the four most-important annual tennis events . Margaret Court ( née Smith ; born 16 July 1942 ) , also known as Margaret Smith Court , is a retired Australian tennis player and former world No. 1 . 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 .
Hypothesis: Steffi Graf is incapable of being a tennis player.
Label: CONTRADICTION