Chile took neighbourly bragging rights at the Copa America, winning their Pacifico clasico with Peru to top Group C, while Uruguay edged Mexico to book a quarterfinal with hosts Argentina.
Four-time finalists Chile have been playing some of the best football at the championship and deservedly saw off two-time champions Peru --- though it took an injury-time own goal from Peruvian defender Andre Carrillo to settle the encounter at Mendoza.
Both sides went into the game with the pressure largely off as they had garnered four points from their opening two games.
A flare-up between Jean Beausejour of Chile and Peru's Giancarlo Carmona proved a low-point, both men sent off on the hour by Brazilian referee Salvio Fagundes --- to the fury of Peru coach Sergio Markarian, who contested the wisdom of Fagundes.
Uruguay meanwhile snapped out of their insipid early tournament form with Alvaro Pereira netting on the quarter-hour against the Mexicans at La Plata following an error by Mexico keeper Luis Michel.
Veteran Uruguayan striker Diego Forlan ran the show, having a hand in the goal while winning a record-equalling 79th cap for his country to go level with former keeper Rodolfo Rodriguez.
Another two goals and Forlan will also share the national scoring record with Hector Scarone, who netted 31 times between 1920 and 1930.
Saturday's quarterfinal against the Lionel Messi-inspired Argentinians, will be eagerly anticipated as both the hosts and the Uruguayans have won a joint record 14 continental titles.