Premise: Serena Williams . The Women 's Tennis Association ( WTA ) has ranked her world no. 1 in singles on eight occasions , from 2002 to 2017 . Williams holds the most Grand Slam titles in singles , doubles , and mixed doubles combined amongst active players . Her record of 39 Grand Slam titles puts her third on the all-time list and second in the open era : 23 in singles , 14 in women 's doubles , and 2 in mixed doubles . She is the only tennis player in history ( man or woman ) to have won singles titles at least six times in three of the four Grand Slam tournaments , and the only player ever to have won two of the four Grand Slams seven times each ( seven Wimbledon titles and seven Australian Open titles ) . She has won an all-time record of 13 Grand Slam singles titles on hardcourt .
Hypothesis: Serena Williams only competes in women's doubles.
Label: CONTRADICTION