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Diego Godin and Co. appeared dumbfounded and the players stood silently throughout, while injured star Luis Suarez was spotted speaking to a teammate on the sidelines.
Goalkeeper Fernando Muslera offered the most confusion, looking around awkwardly during the anthem.
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Copa America later apologized for the error.
“This evening during the pre-match ceremony, due to human error, we inadvertently played the incorrect national anthem,” its statement read. “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.”
