The 2009 Copa Sudamericana semi-finalists will have two away goals to their advantage when they host Uruguay's Rentistas next week, after Oscar Romero and Julio Dos Santos struck either side of half-time for Cerro Porteno.
Romero produced a smart volley in the 28th minute for the visitors, finishing off Jose Maria Ortigoza's speculative cross from a throw-in, while Dos Santos significantly increased Cerro Porteno's advantage in second-half stoppage time, stabbing Carlos Bonet's cutback into the net.
Huachipato also started strongly in the Copa Sudamericana's first round with a double from Andres Vilches handing them a 3-1 victory over Bolivia's San Jose.
Vilches gave Huachipato the lead in just the second minute in Talcahuano with a header, while Leandro Delgado doubled the hosts' advantage three minutes after half-time with a crunching strike from just outside the area.
Mauro Bustamante dragged San Jose back into the contest in the 52nd minute with a penalty but Vilches confirmed Huachipato's victory with 17 minutes remaining, poking a loose ball past visiting goalkeeper Carlos Lampe after a free-kick was allowed to bounce around in the box.
It was better news for San Jose's compatriots Club Universitario as they trumped Deportes Iquique of Chile 2-0 with Alejandro Bejarano and Martin Palavicini scoring for the home side.
In other first-round first-leg results, Venezuela's Deportivo Anzoategui and Ecuador's Emelec both claimed 1-1 draws on the road at Ecuadorian club Universidad Catolica and Aguilas Doradas of Colombia respectively.
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