Serena Jameka Williams is an American professional tennis player. She was ranked as the world No. 1 in women's singles by the Women's Tennis Association (WTA) for 319 weeks, and finished as the year-end No. 1 five times. Williams won 73 WTA Tour–level singles titles, including 23 major women's singles titles—the most in the Open Era, and the second-most of all time. She is the only player to accomplish a Career Golden Slam in both singles and doubles, and the only player to have simultaneously held Olympic gold and all four major titles in both singles and doubles. WTA world No. 1 from February 2, 2009 to April 19, 2009 — 11 weeks. Wiki link