Lionel Messi came to the Copa America looking to end Argentina's 22-year trophy drought, but he was bitterly disappointed after his team were reeled in by Paraguay for a 2-2 draw in their opening match on Saturday.
Argentina overran Paraguay in the first half and took a two-goal lead through Sergio Aguero and Messi's penalty, only for their opponents to hit back with a goal from Nelson Haedo Valdez on the hour and Lucas Barrios's 90th-minute equaliser.
"We were at fault in that we should have had more of the ball in the second half and controlled the match, not they," said Messi, who left the field head bowed after the Group B match at La Serena.
Meanwhile, defending champions Uruguay made a winning start to their campaign as they laboured to a 1-0 win over Jamaica in Antofagasta.
Cristian Rodriguez's close-range finish early in the second half proved to be the only goal of the game as La Celeste stuttered their way to victory.
Elsewhere, Mexico made an underwhelming start to their campaign as they were held to a goalless draw by Bolivia, while central defender Rafael Marquez will miss their two remaining group games through injury.