Premise: Serena Williams . 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 is also the only tennis player to have won 10 Grand Slam singles titles in two separate decades . 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