| Copa América 2004 Peru - Appearances as Referee |  |
 |
 |
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| 12/07/2004 | Venezuela | - | Bolivia | 1:1 | 3 | - | - |
| Copa América 2004 Peru - Appearances as Referee | |
|
|
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| 12/07/2004 | Venezuela | - | Bolivia | 1:1 | 3 | - | - |
| Complete name: | William Mattus Vega |
| Born: | 17/04/1964 |
| Place of birth: |
Costa Rica |
| Nationality: |
Costa Rica |
| Height: | 169 cm |
| Weight: | 75 kg |