Porto will be delighted with the draw they got at the Apostolos Nikolaidis Stadium in Athens.
The home side squandered numerous chances where Michael Konstantinou was at the centre of most of their attacking moves.
However poor finishing ensured the points were shared and Porto left with four yellow cards for Paredes, Costinho, Pena and Paulo Sousa.
Full-time: Panathinaikos 0, Porto 0