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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Spaniard Rafael Nadal hits a shot during his French Open men's second round match against Martin Klizan of Slovakia at Roland Garros in Paris on May 31, 2013. Nadal defeated Klizan 4-6, 6-3, 6-3, 6-3. UPI/David Silpa
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