Portugal dominated the slow-paced game with striker Cristiano Ronaldo twice threatening to score. He shot just past the left post from a narrow angle in the 38th minute, and then forced goalkeeper Wojciech Szczesny to save his long-range free kick in the 69th.
Poland clearly missed injured star striker Robert Lewandowski, who has been riding high with his German club Borussia Dortmund, earning the nickname “Lewangoalski”.
The second half saw the hosts up the pace, with Obraniak latching onto a cross from Lukasz Piszczek but firing over the bar in the 48th minute, before beating a string of defenders three minutes later only to see Rui Patricio save his shot.
The arena took more than three years to build at a cost of 1.7 billion zlotys ($583million; â‚¬426million) and is situated at the site of a communist-era stadium, which in its final years was used as a giant market.