BUENOS AIRES, April 26 -- Keno and Lucas Lima scored either side of halftime as Brazil's Palmeiras defeated six-time champions Boca Juniors 2-0 in their Copa Libertadores Group H match on Wednesday.

Keno put the visitors ahead at the Bombonera stadium by meeting a Marcos Rocha cross with a bullet header that flew into the bottom right corner.

Lima lobbed in Palmeiras' second goal from 30 yards after Boca goalkeeper Augustin Rossi was caught in no man's land, having rushed out of his area seconds earlier for a clumsy clearance.

With 10 points from four matches, Palmeiras are now guaranteed of a berth in the first knockout round of South America's top club competition. Boca are second in the group with five points, two points ahead of Colombia's Junior, who have a game in hand.

In other matches on Wednesday, Monagas beat Defensor Sporting 1-0, Atletico Tucuman overcame The Strongest 3-0, Flamengo drew 0-0 at Santa Fe and Club Nacional routed Real Garcilaso 4-0.