| U20 World Cup 1997 Malaysia - Appearances as Referee |  |
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| 19/06/1997 | Morocco | - | Belgium | 1:1 | 2 | 1 | - |
| 22/06/1997 | Malaysia | - | Belgium | 0:3 | 3 | 2 | - |
| 25/06/1997 | Mexico | - | France | 0:1 | 5 | - | - |
| 29/06/1997 | Japan | - | Ghana | 1:2 aet | 2 | - | - |
| U20 World Cup 1997 Malaysia - Appearances as Referee | |
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| 19/06/1997 | Morocco | - | Belgium | 1:1 | 2 | 1 | - |
| 22/06/1997 | Malaysia | - | Belgium | 0:3 | 3 | 2 | - |
| 25/06/1997 | Mexico | - | France | 0:1 | 5 | - | - |
| 29/06/1997 | Japan | - | Ghana | 1:2 aet | 2 | - | - |
| Complete name: | Ubaldo Aquino Valenzano |
| Born: | 02/05/1958 |
| Place of birth: |
Paraguay |
| Nationality: |
Paraguay |
| Height: | 179 cm |
| Weight: | 77 kg |