MEXICO CITY, July 26 (Reuters) - Sao Paulo goalkeeper Rogerio Ceni converted a late penalty to give the defending champions a precious 1-0 win away to Guadalajara in the first leg of their Libertadores Cup semi-final on Wednesday.
Rogerio scored in the 85th minute to put the Brazilians in command after substitute Aloisio was hauled down by Francisco Rodriguez.
Guadalajara goalkeeper Oswaldo Sanchez tried to put his counterpart off by wobbling at the knees and jumping up and down, but the Sao Paulo captain sent him the wrong way and slotted the kick into the bottom left-hand corner.
It was the third goal in the competition for the free kick and penalty specialist.
The goal came after Sao Paulo survived some fierce pressure from the Mexicans, who fell to Brazil's Atletico Paranaense at the same stage last year.
Adolfo Bautista wasted an excellent chance in the 65th minute when he met Omar Esparza's cross with a weak header at the far post, then Ramon Morales chipped over from 20 metres.
Nine minutes later, Esparza crashed a right-foot shot against the crossbar from the edge of the penalty area.
Guadalajara, whose team included five members of Mexico's World Cup squad, ran out of ideas after falling behind.
Sao Paulo, beaten twice by the same opponents in the group stage, had the better of the first half, despite completing a 15-hour flight from Brazil less than 36 hours before kick-off.
The visitors had the ball in the net in the 19th minute when Ricardo Oliveira rose to deflect home Danilo's free kick.
But television replays clearly showed he used his arm rather than his head and the goal was disallowed amid furious Sao Paulo protests.
The first leg of the other semi-final will be played on Thursday when Paraguay's Libertad host Internacional, another Brazilian team, in Asuncion.