Albion made it back-to-back wins for the first time this season as they brushed aside Southampton at The Hawthorns.
The Baggies came flying out of the block after last week's 5-2 victory at Stamford Bridge with first half goals from Matheus Pereira and Matt Phillips.
Mbaye Diagne also had a goal controversially ruled out by VAR, despite replays showing him to be onside.
Saints came back into the game in the second half but Sam Johnstone was largely untested. Callum Robinson then put the game out of reach when he fired home in the second half.
Johnstone then saved a late penalty from for fellow England international James Ward-Prowse.
Watch all of the highlights below: