League top scorer Jonas struck once in each half and Renato Sanches bagged a goal as the reigning champions continued their fine recent run of form.
The hosts largely dominated the first half hour and opened the scoring in the 35th minute when goalkeeper Pedro Trigueira needlessly brought down Nicolas Gaitan in the area, even though the Argentine forward appeared to be chasing a lost cause.
Jonas sent Trigueira the wrong way from the spot, before converting a second penalty in the 69th minute which was his 10th goal of the season.

Renato Sanches after scoring a goal
Sanches added a spectacular third in the 85th minute as Benfica, the division's highest scorers cruised to victory.

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