Open - Day 9

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Novak Djokovic of Serbia reacts during his men's singles fourth round... News PhotoAdult,Bestof,Day 9,Facial Expression,Grand Slam,Horizontal,Individual Event,Marcel Granollers-Pujol,Match - Sport,Men,New York City,Novak Djokovic,Round Four,Serbia,Spain,Sport,Tennis,Topix,US Open Tennis Championships,USA,USTA National Tennis CenterPhotographer Collection: Getty Images Sport 2013 Getty ImagesNEW YORK, NY - SEPTEMBER 03: Novak Djokovic of Serbia reacts during his men's singles fourth round match against Marcel Granollers of Spain on Day Nine of the 2013 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2013 in New York City. (Photo by Joe Scarnici/Getty Images)