Best of Juan Martin Del Potro

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World number one Serbia's Novak Djokovic returns the ball to... NyhetsfotoATP-touren,Argentina,Boll,Dubai,Dubai Duty Free Men's Open,En människa,Förenade arabemiraten,Gulfstaterna,Horisontell,Juan Martin Del Potro,Människor,Novak Djokovic,Returnera,Semifinal,Serbien,Slå ett slag - Sport,Sport,TennisPhotographer Collection: AFP 2013 AFPWorld number one Serbia's Novak Djokovic returns the ball to Argentina's Juan Martin Del Potro during their ATP Dubai Open tennis semi-final match in the Gulf emirate on March 01, 2013. AFP PHOTO/MARWAN NAAMANI (Photo credit should read MARWAN NAAMANI/AFP/Getty Images)