Barclays ATP World Tour Finals - Day Seven

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David Luiz of Chelsea watches the men's singles semi-final match... News PhotoATP World Tour,ATP World Tour Finals,Adult,Adults Only,Barclays - Brand Name,David Luiz,Day,England,Horizontal,Individual Event,Kensington And Chelsea,London - England,Men,Novak Djokovic,One Man Only,One Person,People,Semifinal Round,Serbia,Sport,Stanislas Wawrinka,Switzerland,Tennis,Tennis Tournament,The O2 - England,UK,WatchingPhotographer Collection: Getty Images Sport 2013 Getty ImagesLONDON, ENGLAND - NOVEMBER 10: David Luiz of Chelsea watches the men's singles semi-final match between Novak Djokovic of Serbia and 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 Clive Brunskill/Getty Images)