Silva and Fernandes scored, with Akaydin's own goal, as Portugal secured a decisive 3-0 victory over Turkey in Dortmund, securing the top spot in Group F.
With Lewandowski, who had mesmerized Germany for years while representing Bundesliga giant Bayern Munich, starting on the bench, Austria were rewarded for a positive start inside ten minutes.
Denmark kicked off with high motivation on their home turf, nearly scoring 11 minutes into the game when Jonas Wind's powerful header inside the box was skillfully handled by Slovenia's goalkeeper Jan Oblak.