Novak Djokovic of Serbia holds the ATP World Tour No 1 Award trophy after being presented with two ATP World Tour Awards during a ceremony at the ATP World Tour Finals in London Tuesday, Nov. 6, 2012. (AP Photo/Kirsty Wigglesworth)

Associated Press
Novak Djokovic of Serbia holds the ATP World Tour No 1 Award trophy after being presented with two ATP World Tour Awards during a ceremony at the ATP World Tour Finals in London Tuesday, Nov. 6, 2012. (AP Photo/Kirsty Wigglesworth)
Novak Djokovic of Serbia holds the ATP World Tour No 1 Award trophy after being presented with two ATP World Tour Awards during a ceremony at the ATP World Tour Finals in London Tuesday, Nov. 6, 2012. (AP Photo/Kirsty Wigglesworth)
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