Barclays ATP World Tour Finals - Day Seven

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Novak Djokovic of Serbia hits a forehand in his men's singles... News PhotoATP World Tour,ATP World Tour Finals,Adult,Barclays - Brand Name,Day,England,Forehand,Horizontal,Individual Event,London - England,Men,Novak Djokovic,One Person,People,Semifinal Round,Serbia,Sport,Stanislas Wawrinka,Switzerland,Taking a Shot - Sport,Tennis,Tennis Tournament,The O2 - England,UKPhotographer Collection: Getty Images Sport 2013 Getty ImagesLONDON, ENGLAND - NOVEMBER 10: Novak Djokovic of Serbia hits a forehand in his men's singles semi-final match against Stanislas Wawrinka of Switzerland during day seven of the Barclays ATP World Tour Finals at O2 Arena on November 10, 2013 in London, England. (Photo by Julian Finney/Getty Images)