William Mattus is a retired football referee from Costa Rica. Career record in the WorldReferee database spans 1999 to 2004. William Mattus has officiated 17 matches across 11 competitions in our database. Career disciplinary totals: 73 yellow cards and 2 red cards, averaging 4.29 yellows and 0.118 reds per match. 2 penalties awarded. Competitions include WC 1999 u20, 2002 FIFA Men's World Cup, Pan American Games 2003. William Mattus is a FIFA World Cup referee.
| Copa America 2004 | |||||||
| group stage | Venezuela | vs | Bolivia | 1 - 1 | 2004-06-12 | 3 | |
| WC 2006 qualifiers - Am/Caribbean | |||||||
| 2nd stage | Jamaica | vs | USA | 1 - 1 | 2004-08-18 | 1 | |
| 1st stage | Dominican Republic | vs | Anguilla | 0 - 0 | 2004-03-19 | 3 | |
| Olympic qualifiers 2004 | |||||||
| 2nd round | USA OT | vs | St Kitts and Nevis OT | 4 - 0 | 2003-11-19 | 4 | |
| Pan American Games 2003 | |||||||
| 1st round | Brazil OT | vs | Cuba OT | 2 - 1 | 2003-08-09 | 5 | |
| 1st round | Mexico OT | vs | Guatemala OT | 1 - 1 | 2003-08-02 | 51 | |
| WC 2002 | |||||||
| group stage | Ecuador | vs | Croatia | 1 - 0 | 2002-06-13 | 3 | |
| group stage | Japan | vs | Belgium | 2 - 2 | 2002-06-04 | 5 | |
| 2002 FIFA Men's World Cup | |||||||
| group stage | Ecuador | vs | Croatia | 1-0 | 2002-06-13 | 3 | |
| group stage | Japan | vs | Belgium | 2-2 | 2002-06-04 | 5 | |
| WC 2002 play-offs | |||||||
| 2nd leg | Iran | vs | Ireland | 1 - 0 | 2001-11-15 | 4 | |
| friendly | |||||||
| Mexico | vs | Brazil | 3 - 3 | 2001-03-07 | |||
| WC 2002 qualifiers - Am/Caribbean | |||||||
| 1/2 finals | Mexico | vs | Canada | 2 - 0 | 2000-08-15 | 7 | |
| Club World Cup 00 | |||||||
| group stage | Real Madrid | vs | Corinthians | 2 - 2 | 2000-01-07 | 7 | |
| WC 1999 u20 | |||||||
| 1/4 finals | Spain u20 | vs | Ghana u20 | 1 - 1 | 1999-04-18 | 111 | |
| group stage | Cameroon u20 | vs | England u20 | 1 - 0 | 1999-04-08 | 5 | |
| group stage | Cameroon u20 | vs | Japan u20 | 2 - 1 | 1999-04-05 | 2 | |
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