Swiss tennis player Roger Federer shakes hands with Argentinian Juan... Nieuwsfoto'sArgentinië,Buenos Aires,Demonstratiewedstrijd,Hand,Horizontaal,Iemand een hand geven,Juan Martin Del Potro,Mensen,Persconferentie,Roger Federer,Sport,Tennis,Vlak naast,Zwitserse cultuurPhotographer Collection: AFP 2012 AFPSwiss tennis player Roger Federer(R) shakes hands with Argentinian Juan Martin Del Potro during a press conference in Tigre, near Buenos Aires on December 11, 2012, ahead two exhibition matches that will be held on December 12 and 13. AFP PHOTO / Alejandro PAGNI (Photo credit should read ALEJANDRO PAGNI/AFP/Getty Images)