Barclays ATP World Tour Finals - Day Seven

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Roger Federer of Switzerland signs autographs for fans prior to his... News PhotoATP World Tour,ATP World Tour Finals,Adult,Autographing,Barclays - Brand Name,Day,England,Fan - Enthusiast,Horizontal,Individual Event,London - England,Men,Rafael Nadal,Roger Federer,Semifinal Round,Signing,Spain,Sport,Switzerland,Tennis,Tennis Tournament,The O2 - England,UKPhotographer Collection: Getty Images Sport 2013 Getty ImagesLONDON, ENGLAND - NOVEMBER 10: Roger Federer of Switzerland signs autographs for fans prior to his men's singles semi-final match against Rafael Nadal of Spain 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)