Premise: Serena Williams . Williams holds the most Grand Slam titles in singles , doubles , and mixed doubles combined amongst active players . She is the most recent female player to have held all four Grand Slam singles titles simultaneously ( 2002 -- 03 and 2014 -- 15 ) and the third player to achieve this record twice after Rod Laver and Steffi Graf .
Hypothesis: Serena Williams only competes in women's doubles.
Label: CONTRADICTION