World Number 1 Novak Djokovic plays World Number 4 Stan Wawrin

Novak Djokovic celebrates after dismissing Stanislas Wawrinka in straight sets. World Number 1 Novak Djokovic from Serbia plays World Number 4 Stan Wawrinka from Switzerland in the group B. Barclays ATP World Tour Finals 2014. London O2 Arena. (c) Matt Bristow | SportPix.org.uk

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