Chile produced a second-half comeback to beat Mexico 2-1 and claim the early top spot in Group C in the Copa America.
Mexico had taken the lead through Nestor Aurajo just before half-time, but goals from substitute Esteban Paredes and Arturo Vidal got Chile off to a winning start.
Having never lifted the trophy before, Claudio Borghi's men gave an impressive demonstration of their credentials to do so this time around as they became just the second side to register a win so far.
Mexico were on the back foot from the off, but had an early opening when Giovani Dos Santos went on a weaving run that resulted in him having a shot blocked.
Chile remained the better side, though, especially with Alexis Sanchez, one of world football's most wanted players, looking dangerous.
They did not expect to fall behind to Aurajo's looping header in the 40th minute, but they did, although they need not have worried.
Paredes came off the bench on the hour and seven minutes later he was at full stretch at the far post to bundle home on the line after four players had all gone for the same ball in the box.
Then, Vidal got a start on his marker at the near post and planted a header into the opposite corner to win it, although it required some late indecision in the box from Edgar Pacheco to cement the points.