Czech Republic's Tomas Berdych returns a ball to Novak Djokovic of Serbia during their Davis Cup finals tennis singles match in Belgrade, Serbia, Sunday, Nov. 17, 2013. (AP Photo/Darko Vojinovic)

Serbia Davis Cup Tennis

Czech Republic's Tomas Berdych returns a ball to Novak Djokovic of Serbia during their Davis Cup finals tennis singles match in Belgrade, Serbia, Sunday, Nov. 17, 2013. (AP Photo/Darko Vojinovic)

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