The world's best tennis players show their intensity on the clay courts at Roland Garros during the 2013 French Open in Paris.
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Na Li of China hits a shot during her French Open women's second round match against American Bethanie Mattek-Sands at Roland Garros in Paris on May 30, 2013. Mattek-Sands defeated Li 5-7, 6-3, 6-2. UPI/David Silpa
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