| Copa Libertadores 1998 - Appearances as Referee |  |
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 |
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| 19/03/1998 | CF América | - | Vasco da Gama - RJ | 1:1 | 6 | 1 | 1 |
| 14/04/1998 | Nacional | - | Grêmio Porto Alegre | 1:1 | - | - | 3 |
| Copa Libertadores 1998 - Appearances as Referee | |
|
|
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| 19/03/1998 | CF América | - | Vasco da Gama - RJ | 1:1 | 6 | 1 | 1 |
| 14/04/1998 | Nacional | - | Grêmio Porto Alegre | 1:1 | - | - | 3 |
| Complete name: | Ubaldo Aquino Valenzano |
| Born: | 02/05/1958 |
| Place of birth: |
Paraguay |
| Nationality: |
Paraguay |
| Height: | 179 cm |
| Weight: | 77 kg |