RIO DE JANEIRO, Feb 9 (Reuters) - A late goal by Ramon Morales gave Mexico's Guadalajara a 1-0 win at Cienciano on Wednesday in the opening game of Group 1 of the Libertadores Cup.
In Group 4, Chile's Universidad Catolica overcame Mexico's UANL in a thriller that ended 3-2.
Guadalajara's attempts to take the game to the Peruvian club failed to provide a spectacle and a goalless draw seemed on the cards until a midfield tussle resulted in a free kick in the dying seconds.
Morales's left-footed effort floated beyond the outstretched arms of Oscar Ibanez.
Cienciano, the club based in the ancient Inca capital of Cusco at an altitude of 3,300 metres, failed to make home advantage count in an error-strewn game.
Brazil's Sao Paulo travel to Caracas FC next week for the second Group 1 encounter.
Any late arrivals to the clash between Universidad Catolica and UANL would have missed a flurry of early action that put the home club into a 2-1 lead with seven minutes on the clock.
Chilean Sebastian Gonzalez latched on to a perfect ball from Julio Cesar Santos to put the Mexican club ahead but Jose Pedro Fuenzalida finished off a fine move to equalise and Jorge Quinteros gave Universidad the lead.
Argentine striker Quinteros added a second goal which, like his first, was served up by compatriot Dario Conca.
UANL did not give up the battle and Aldo de Negris raised Tigres's hopes with an angled shot from outside the area.
Universidade coach Jorge Pellicer reshuffled to defend the home club's lead and UANL were kept at bay.
Group 4 has been dubbed the champions' group because Universidad Catolica, Cienciano, Brazilian club Corinthians and Colombia's Deportivo Cali are title holders in their countries.
In Montevideo, Uruguay's Nacional notched up a solid 2-0 win over Mexican club UNAM to make an ideal start in Group 6.
Gonzalo Castro fired Nacional into a first-half lead, and scored a second from a second-half penalty awarded for pushing.
Argentine referee Hector Baldassi sent off Nacional's Dario Veron for a second bookable offence.
Brazilian club Internacional and Venezuela's Union Atletico meet in the second game in Group 6.