Serena Williams is a tennis player.
Serena Jameka Williams ( born September 26 , 1981 ) is an American professional tennis player . In total , she has been world no. 1 for 319 weeks , which ranks her third in the Open Era among female tennis players . 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 ) .