Argentine midfielder Fernando Belluschi's fourth-minute corner was deflected by Benfica's Carlos Martins and flew straight to Rolando, whose unchallenged header gave last season's cup-winners Porto an early lead.
Benfica took some time to react and only approached the Porto box consistently in the final fifteen minutes of the half, though without creating clear chances.
It was Porto who almost scored a second just before halftime. Benfica keeper Roberto palmed away a Hulk's cross and the ball fell to Joao Moutinho whose first-time shot was cleared off the line by Brazilian defender Luisao.
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Porto's well-organised midfield dominated the start of the second half and the northern side doubled their lead on 67 minutes when impressive winger Silvestre Varela beat Luisao on the left flank and crossed for the incoming Falcao to fire in.
Benfica rarely threatened and only came close to pulling one back five minutes from the final whistle with Paraguay international Oscar Cardoso putting Javier Saviola through but Helton made a fine save to deny the Argentine forward.
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