Serbia's Novak Djokovic celebrates winning his Group A singles match against Czech Republic's Tomas Berdych with his coach Boris Becker (L) and friends on day six of the ATP World Tour Finals tennis tournament in London on November 14, 2014. Djokovic won 6-2, 6-2. AFP PHOTO/LEON NEAL (Photo credit should read LEON NEAL/AFP via Getty Images)
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