With Saudi Arabia creating a seismic World Cup moment with their stunning victory, it leaves this group wide open and all four sides will now harbour hopes of reaching the last 16.
A tremendous atmosphere at Stadium 974, built using that number of shipping containers, was let down by a poor spectacle on the pitch.
Napoli forward Lozano had their best chances, but a strike from range and flicked header were both kept out by Szczesny, while Uriel Antuna cut in from the right but strangled a shot straight at the goalkeeper late on.