William Mattus Vega (born April 17, 1964, in Barva, Heredia) is a Costa Rican former football referee, best known for supervising two matches during the 2002 FIFA World Cup held in Japan and South Korea. As of 2022, Mattus is the last Costa Rican to officiate a match at a FIFA World Cup, as fellow countrymen have performed as assistant referees only. Wikipedia text is available under the terms of the GNU Free Documentation License - Full article GamesComments (0)Country refsComment Referee about ---- Games on Database ---- 12-Jul-04 - Venezuela vs Bolivia - Copa America 13-Jun-02 - Ecuador vs Croatia - World Cup 04-Jun-02 - Japan vs Belgium - World Cup 07-Jan-00 - R. 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