He has refereed in three UEFA Cup finals, in 1995 (first leg), 1998 and 2000. López set a record at the 2002 FIFA World Cup, issuing 14 yellow cards and 2 red cards in a match between Germany and Cameroon. This record was then broken in the 2006 tournament by Valentin Ivanov during the match between Portugal and Netherlands, who issued 16 yellow cards and 4 red cards.