BUENOS AIRES, July 20 (Reuters) - Mexico's Guadalajara completed a miserable week for Argentina in the Libertadores Cup on Thursday when they beat Velez Sarsfield 2-1 away to reach the semi-finals.
Guadalajara, held 0-0 at home in the first leg, joined Brazilian pair Sao Paulo and Internacional and Paraguay's Libertad in the last four after winning the quarter-final tie 2-1 on aggregate.
Argentina's interest in the tournament ended as Velez became their third team this week to get knocked out.
River Plate were beaten 3-1 by Libertad on Tuesday, going out 5-3 on aggregate, and Estudiantes lost on penalties to Sao Paulo on Wednesday after their tie ended 1-1 on aggregate.
Velez, previously unbeaten in the competition, sorely missed injured striker Lucas Castroman.
His replacement Mauro Zarate wasted an excellent early chance when he was left alone in the penalty area but chipped his shot over the crossbar.
Guadalajara went ahead in the 27th minute when Ramon Morales, one of five members of Mexico's World Cup squad in their line-up, converted a penalty awarded for handball by Marcelo Bustamante.
The goal rattled Velez's young team, who looked increasingly vulnerable on the counter-attack, Morales and Adolfo Bautista both having shots saved by Gaston Sessa after halftime.
Despite having defender Diego Martinez sent off for a second bookable offence, Guadalajara increased their lead when Bautista scored with a deflected shot following a corner in the 73rd minute.
Substitute Pablo Batalla set up a dramatic finale by pulling a goal back with a long-range shot in the 83rd minute.
Leandro Somoza had another long-range shot superbly turned away by Guadalajara goalkeeper Oswaldo Sanchez before Velez ran out of steam.
Guadalajara face defending champions Sao Paulo in the semi-finals while Libertad meet Internacional.