His delightful top-corner chip caught MLS starting goalkeeper Roman Bürki by surprise as he watched the floated effort hit his net.
Leandro Trossard doubled the visitors’ advantage in the 23rd minute, launching home a powerful blast that evaded Bürki after the Belgian used some nifty dribbling to set up the shot.
Hopes of an MLS comeback lessened almost immediately after the second half began, when center back Tim Parker was whistled for a handball in the box. Jorginho stepped up for the 47th-minute penalty kick and coolly slotted it past goalkeeper Tyler Miller.
The Gunners put the game to bed with two goals in the final portion, first when club captain Martin Ødegaard sent Gabriel Martinelli through on goal for a curled-home finish (84′). Summer signing Kai Havertz then capped the scoring after collecting a cross at the back post, lashing home a left-footed volley to settle the 5-0 scoreline (89′).