Patrick van Aanholt came off the bench to snatch a late equaliser for Sunderland as they looked to be heading to defeat against West Brom.
The Baggies took the lead after record transfer signing Nacer Chadli continued his fine form and raced clear to finish cooly past Black Cats' goalkeeper Jordan Pickford.
Pickford found himself in the thick of the action throughout the tie, and struggled to hide his frustration with the Sunderland defence as West Brom continued to surge forward.
But the Black Cats' stopper was able to keep his side in the match long enough for Van Aantholt to send a powerful header past Ben Foster on 83 minutes to grab a valuable point for David Moyes' side.