Pablo Mouche's goal in the 52nd minute lifted Boca Juniors to a 1-0 victory over a 10-man Fluminense in a first-leg quarter-final of the Copa Libertadores.
Mouche scored from a sharp-angled, left-footed shot from 10 meters (yards) that sneaked inside the far post behind keeper Diego Cavalieri.
The Rio de Janeiro club played with 10 men after Carlinhos was shown a red card in the 34th following a bruising tackle.
"We needed to win at home and after the first goal we were hopeful of getting another," Juniors midfielder Juan Roman Riquelme said. "But we lacked finishing. We didn't bother them as much as we should have."
With former star and Manchester City forward Carlos Tevez watching at Boca's La Bombonera stadium, the home side started slowly but was in control by the time Carlinhos was sent off.
Boca began to press and came up with a chance in the 18th when Cavalieri stopped Facundo Roncaglia on a close-in shot. Minutes later, Dario Cvitanich sailed a shot over the crossbar.
Boca had all the possession with the man advantage.
Cavalieri sprawled to stop Mouche in the 41st. A minute later, Riquelme shot just wide of the near post, and seconds later Cavalieri came up with a save on Rolando Schiavi.
Referee Hernan Buitrago missed a penalty late in the first half with replays showing Roncaglia stopped a shot in the area with his outstretch arm.
Boca Juniors had most of the chances in the second half, but failed to get a second goal to give them a strong edge in the second leg. Fluminense was the more threatening club in the final minutes.In another match between Argentinian and Brazilian sides,