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

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