Serena Jameka Williams (born September 26, 1981) is an American professional tennis player. She has been ranked World No. 1 by the Women's Tennis Association (WTA) on four separate occasions; as of July 4, 2009, she is ranked World No. 2. She is the reigning US Open, Australian Open and Wimbledon singles champion and has won 22 Grand Slam titles: 11 in singles, nine in women's doubles and two in mixed doubles. In addition, she has won two Olympic gold medals in women's doubles. She also has won more Grand Slams than any other active female player and has won more career prize money than any other female athlete in history. In 2005, Tennis Magazine ranked her as the 17th-best player in 40 years.