Spain's Rafael Nadal celebrates winning a point against Argentina's Juan Martin Del Potro during the Davis Cup final fourth match at La Cartuja Olympic stadium in Sevilla on December 4, 2011. AFP PHOTO/JAVIER SORIANO
Spain's Rafael Nadal returns a ball to Argentina's Juan Martin Del Potro during the Davis Cup final fourth match at La Cartuja Olympic stadium in Sevilla on December 4, 2011. AFP PHOTO/JAVIER SORIANO
Argentina's Juan Martin Del Potro celebrates winning a point against Spain's Rafael Nadal during the Davis Cup final fourth match at La Cartuja Olympic stadium in Sevilla on December 4, 2011. AFP PHOTO/JAVIER SORIANO