The 18-year-old striker made a real impact in his first appearance for the Gunners
Arsenal’s pre-season tour of the United States got off to a fine start as they ran out 3-0 winners over Colorado Rapids.
A youthful team were in fine fettle as they put their MLS opponents to the sword at Dick’s Sporting Goods Park.
Starlets Bukayo Saka and James Olayinka got on the scoresheet in the first-half, with the latter capitalising on some dodgy play by the Americans.
But there was a great moment for new signing Gabriel Martinelli too as he grabbed the third goal, guiding home a firmly struck cross from Dominic Thompson just after the hour-mark.
And the Brazilian wonderkid, 18, impressed many supporters who stayed up to watch the match, which kicked off at 2am BST, as you can see from the reaction on Twitter below.
Every Premier League club’s confirmed pre-season fixtures