Gunners skipper Pierre-Emerick Aubameyang scored a hat-trick to help Arsenal secure the first win of the season as they beat a young West Bromwich Albion side to reach the third round of the Carabao Cup.
Aubameyang marked his first start of the season with two solid first-half tap-ins and a curling finish after the break
He also acrobatically set up Nicolas Pepe for the third, with Bukayo Saka slotting in the fourth goal.
Alexandre Lacazette came off the bench to fire in the sixth.
The win could have been even bigger too, with Martin Odegaard hitting the outside of the post from a tight angle and Pepe striking the bar with a chip.
His third was much harder to execute, but he did so with aplomb, curling in from 18 yards after cutting into the box.
With him among the goals again, Pepe and Saka opening their accounts for the season and Lacazette adding to the competition up front, Gunners boss Mikel Arteta can be more optimistic about facing Manchester City in the Premier League this coming weekend.
Watch the highlights below: