Referee Mauro Vigliano shows the red card to Argentina's Boca Juniors' Guillermo Burdisso, left, as Argentina's Newell's Old Boys' goalkeeper Nahuel Guzman look on during a Copa Libertadores quarterfinal soccer match in Buenos Aires, Argentina, Friday, May 24, 2013. The match ended in a 0-0 draw. (AP Photo/Eduardo Di Baia)