PARIS - MAY 21: Novak Djokovic of Serbia lies down at the centre court during the exhibition match  at French Open, Roland Garros on May 21, 2011 in Paris, France.
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PARIS - MAY 21: Novak Djokovic of Serbia lies down at the centre court during the exhibition match at French Open, Roland Garros on May 21, 2011 in Paris, France.