Man City started the second half on the front foot and pinned last year’s finalists, PSG, inside their own half.
And City found themselves level with a slice of luck.
A Man City corner was worked across the edge of PSG’s penalty area and to De Bruyne.
The Belgian shifted the ball onto his right foot and delivered what looked like a cross toward the far post, catching out Navas to draw City level.
PSG looked a different team to the team that played so well in the first half.
And Parades conceded a sloppy free-kick in the 71st minute.
De Bruyne shaped up to shoot, but left it to Mahrez who bent the free-kick through the wall and into the bottom-left corner.
PSG lost all composure, and minutes later, Gueye was sent off for a reckless challenge on Gundogan.
Still all to play for in the second leg next Tuesday, but Man City have a massive, massive, two away goal advantage.