Danny Welbeck struck twice as Arsenal defeated Brentford 3-1 in their Carabao Cup tie.
The striker headed in Matteo Guendouzi's cross after five minutes before poking home a brilliant move before half-time at Emirates Stadium.
Brentford's Alan Judge curled a superb 20-yard free-kick into the top corner after the break.
Substitute Alexandre Lacazette scored a third for Arsenal in stoppage time.
The Frenchman pounced on a loose ball and slotted home, before Mohamed Elneny had a goal ruled out for offside.