Samantha Jane "Sam" Stosur (born 30 March 1984) is an Australian professional tennis player. She won the 2011 US Open singles title and was a finalist at the 2010 French Open. Stosur is ranked World No. 5 and her career high in singles is World No. 4, achieved on 21 February 2011. She is a former world No. 1 on the WTA Tour in doubles with Lisa Raymond from the United States.She is currently Australian Number 1.