Dominant Albion were pegged back and held to a 1-1 draw by Millwall at The Hawthorns the last time the two teams met in the league.
The Baggies took a deserved lead when Kyle Bartley met an inswinging Matt Phillips free-kick just before the hour mark in their first home league game under Slaven Bilić.
However, Millwall substitute Matt Smith converted from close range in the 75th minute to snatch a point for the visitors.
Watch the video above to see how the game unfolded.