Underdog Penarol of Uruguay had a 1-0 home win over Argentina's Velez Sarsfield in Thursday's first leg of their Copa Libertadores semifinal.

Dario Rodriguez headed a looping corner kick behind Velez keeper Marcelo Barovero with only 30 seconds left in the first half to give the Uruguay side the decisive goal.

Brazil club Santos also had a 1-0 home win against Paraguay's Cerro Porteno on Wednesday in the other semifinal first leg. Santos and Velez are favorites to progress when the second-leg matches are played next week in South America's top club tournament.