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Dinara Safina is a Russian former professional tennis player who is the younger sister of Marat Safin. She was ranked world No. 1 in singles by the Women's Tennis Association (WTA) for 26 weeks, including a 17-week period as the official year-end No. 1 in 2009. She won one Grand Slam singles title, the 2009 French Open, and was runner-up at the 2008 Australian Open and the 2010 French Open.