Serena Jameka Williams (born September 26, 1981) is an American professional tennis player who is ranked No. 1 in women's singles tennis. The Women's Tennis Association (WTA) has ranked her world No. 1 in singles on six separate occasions. She became the world No. 1 for the first time on July 8, 2002, and achieved this ranking for the sixth time on February 18, 2013.