Here is why Uruguay players were left bemused before their Copa America match

Copa America organisers were left red-faced on Sunday after playing the wrong national anthem for Uruguay before their match against Mexico in Arizona.

The Uruguay players lined up on the pitch for their anthem, "Orientales, la Patria o la Tumba", ahead of their tournament opener but were greeted instead by the national anthem of Chile at University of Phoenix Stadium in Glendale.

Most of the Uruguay players were expressionless at first, before their poker faces gave way to some looks of bemusement.

Organisers quickly sent out an apology.

"We sincerely apologize to the Uruguayan Federation, the Uruguay National Team, the people of Uruguay and to the fans for this mistake. We will work with all parties involved to ensure such an error does not occur again," the statement said.

The mistake capped off an ignominious opening weekend to the tournament, which the United States is hosting for the first time, with few goals, some mediocre games and, in some cases, sparse crowds.

Uruguay's day did not get better as they were beaten 3-1 by the Mexicans.

Image: Uruguay's Jose Gimenez reacts on the field during the 2016 Copa America Centenario Group C match against the Mexico at University of Phoenix Stadium in Glendale, Arizona, on Sunday

Photograph: Jennifer Stewart/Getty Images