| Copa Libertadores 1999 - Appearances as Referee |  |
 |
 |
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| 08/04/1999 | Blooming | - | LDU Quito | 3:1 | - | - | - |
| 20/04/1999 | Nacional | - | Cerro Porteño | 2:1 | - | - | - |
| Copa Libertadores 1999 - Appearances as Referee | |
|
|
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| 08/04/1999 | Blooming | - | LDU Quito | 3:1 | - | - | - |
| 20/04/1999 | Nacional | - | Cerro Porteño | 2:1 | - | - | - |
| Complete name: | Guido Augustin Aros Alvarado |
| Born: | 23/11/1965 |
| Place of birth: |
Chile |
| Nationality: |
Chile |