Spain's Rafael Nadal returns the ball to Argentina's Juan Martin Del Potro during their Davis Cup final reverse singles rubber at the Olympic Stadium in Seville December 4, 2011. REUTERS/Javier Diaz (SPAIN - Tags: SPORT TENNIS)
Argentina's Juan Martin Del Potro returns the ball to Spain's Rafael Nadal during their Davis Cup final reverse singles rubber at the Olympic Stadium in Seville December 4, 2011. REUTERS/Javier Diaz (SPAIN - Tags: SPORT TENNIS)
Argentina's team captain Tito Vazquez (L) and Spain's captain Albert Costa talk before the Davis Cup final reverse singles rubber between Spain's Rafael Nadal and Argentina's Juan Martin Del Potro at the Olympic Stadium in Seville December 4, 2011. REUTERS/Marcelo Del Pozo (SPAIN - Tags: SPORT TENNIS)