BUENOS AIRES, Nov 30 (Reuters) - Ayrton Costa's early goal earned Boca Juniors a 1-0 home victory over Argentinos Juniors at La Bombonera on Sunday, sending them into the semi-finals of Argentina's Clausura tournament.

Leandro Paredes delivered a corner in the fifth minute, and although Miguel Merentiel's shot from the centre of the area was saved by Argentinos goalkeeper Gonzalo Siri, Costa pounced on the rebound to put Boca in the lead.