An own-goal helped Chile seal top spot in Group C of the Copa America, with Uruguay and Peru joining them in the quarter-finals.
Chile's 1-0 win over Peru in Mendoza on Tuesday means they will now face Group B's second-placed side in the last eight, to be determined in Wednesday's matches.
Peru finished below Chile and Uruguay but qualify as one of the best-ranked third-placed nations, and avoided a quarter-final meeting with tournament hosts Argentina in the process.
That fate falls to Uruguay, who spurned numerous chances before edging Mexico 1-0 in Tuesday's later game.
With Chile and Peru having already qualified for the quarter-finals before their clash at Mendoza's Estadio Malvinas Argentinas, both managers elected to make wholesale changes to their starting XIs.
Peru alone made nine changes and - while the game remained entertaining - it took a 92nd-minute own-goal from Peru substitute Andre Carillo to separate the two nations at the final whistle.
While both sides did not hold back, clear chances were rare and composed finishing virtually non-existent.
Chile striker Esteban Paredes was somehow unable to convert Jean Beausejour's cross from point-blank range midway through the first half, while Michael Guevara passed up a similar chance for Peru at the other end shortly before the half-time whistle.
The odd strong challenge had kept things willing throughout the match, and tempers eventually boiled over on the hour mark.
Alexis Sanchez wasted little time in proving a nuisance after his 58th-minute substitution, and the Barcelona-bound midfielder drew a cynical booking from Peru defender Christian Ramos.
The ensuing push-and-shove between Beausejour and Giancarlo Carmona resulted in straight red cards for both players, meaning they will miss their nation's quarter-final matches.
Carillo's unfortunate contribution put Chile in front as the seconds dwindled away, with a bicycle kick from Peru midfielder Renzo Revoredo straight at goalkeeper Miguel Pinto the game's last chance of note.
In La Plata, Alvaro Pereira's 15th-minute tap in proved the difference, though Uruguay's errant finishing in their only win of the tournament so far will come as a concern to manager Oscar Tabarez.
Striker Diego Forlan - who otherwise impressed with his workrate and vision - spurned the best of the chances, hitting the upright with the goal at his mercy in the first half and prodding over from just yards out in the second.
Luis Suarez's finishing also left plenty to be desired, no more so than when he pushed his shot wide after getting on the end of Forlan's superb dink over the defence.
Mexico nearly stole a point when striker Rafael Marquez Lugo bundled the ball home in the 81st minute, but the linesman had raised his flag for an offside call in the build-up.