The Frenchman received the ball just inside the penalty area from Aaron Ramsey in the 56th minute.
A deft first touch moved the ball into a pocket of space on his right foot, wrong-footing defender Jonjoe Kenny.
Lacazette then arrowed a curling finish into the very top corner of Jordan Pickford's net, giving the England goalkeeper no chance at all.
The goal came against the run of play, as Arsenal had made a poor start to the game.
Lacazette now has 19 goals in 44 appearances for the Gunners.
September 23, 2018