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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American Ryan Harrison hits a shot during his French Open men's second round match against American John Isner at Roland Garros in Paris on May 31, 2013. Isner defeated Harrison 5-7, 6-7 (7), 6-3, 6-1, 8-6. UPI/David Silpa
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