Uruguay's players were left looking at each other in bemusement prior to their Copa America clash with Mexico when the wrong national anthem was played.
Instead of "Orientales, la Patria o la Tumba", organisers played the national anthem of Chile.
Tournament officials apologised to the "people of Uruguay" and blamed human error for the mistake.
To compound matters, Uruguay, missing the injured Luis Suarez, conceded two late goals to lose the match 3-1.
The Copa America is being held in United States for the first time.
|Copa America 2016 results|
|6 June, Group C: Mexico 3-1 Uruguay|
|5 June, Group B: Haiti 0-1 Peru|
|5 June, Group B: Brazil 0-0 Ecuador|
|5 June, Group C: Jamaica 0-1 Venezuela|
|4 June, Group A: USA 0-2 Colombia|
|4 June, Group A: Costa Rica 0-0 Paraguay|
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