Novak Djokovic of Serbia returns the ball to Sam Querrey of the U.S. during their match at the Paris Tennis Masters tournament, Wednesday, Oct. 31, 2012. (AP Photo/Christophe Ena)

Associated Press
Novak Djokovic of Serbia returns the ball to Sam Querrey of the U.S. during their match at the Paris Tennis Masters tournament, Wednesday, Oct. 31, 2012. (AP Photo/Christophe Ena)
Novak Djokovic of Serbia returns the ball to Sam Querrey of the U.S. during their match at the Paris Tennis Masters tournament, Wednesday, Oct. 31, 2012. (AP Photo/Christophe Ena)
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