Samantha Jane Stosur is an Australian former professional tennis player. She is a former world No. 1 in doubles, a ranking which she first achieved on 6 February 2006 and held for 61 consecutive weeks. Also a former top ten singles player, Stosur reached a career-high singles ranking of world No. 4 on 21 February 2011 and spent a total of 165 weeks ranked inside the top ten, between March 2010 and June 2013. Stosur was also the top-ranked Australian singles player for 452 consecutive weeks, from October 2008 to June 2017, and was ranked inside the top 25 for a period of nine straight years. She won a combined total of 40 career titles, including 8 major titles, and amassed more than $20 million in prize money.

The WTA rankings are the ratings defined by the Women's Tennis Association, introduced in November 1975. The computer that calculates the ranking is nicknamed "Medusa".