| U20 World Cup 2011 Colombia - Appearances as Assistant | ||||
| 31/07/2011 | Costa Rica | - | Spain | 1:4 |
| 04/08/2011 | Croatia | - | Nigeria | 2:5 |
| 14/08/2011 | France | - | Nigeria | 3:2 aet |
| U20 World Cup 2011 Colombia - Appearances as Assistant | ||||
| 31/07/2011 | Costa Rica | - | Spain | 1:4 |
| 04/08/2011 | Croatia | - | Nigeria | 2:5 |
| 14/08/2011 | France | - | Nigeria | 3:2 aet |
| Complete name: | William Casavieja |
| Born: | 22/10/1973 |
| Place of birth: |
Uruguay |
| Nationality: |
Uruguay |