Australian Open - Day 7

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Novak Djokovic of Serbia reacts in his fourth round match against... News PhotoAustralia,Australian Tennis Open,Day,Facial Expression,Grand Slam,Horizontal,Match - Sport,Melbourne - Australia,Novak Djokovic,One Person,People,Round Four,Serbia,Sport,Stanislas Wawrinka,Switzerland,TennisPhotographer Collection: Getty Images Sport 2013 Getty ImagesMELBOURNE, AUSTRALIA - JANUARY 20: Novak Djokovic of Serbia reacts in his fourth round match against Stanislas Wawrinka of Switzerland during day seven of the 2013 Australian Open at Melbourne Park on January 20, 2013 in Melbourne, Australia (Photo by Julian Finney/Getty Images)