Mbaye Diagne got The Baggies off to a dream after just 80 seconds before United drew level through Bruno Fernandes’ stunning effort, with Harry Maguire seeing a last-gasp header superbly turned on to a post by Sam Johnstone as a scrappy clash ended 1-1.
The second period was more open and eventful.
Referee Craig Pawson overturned his decision to award a penalty for a Semi Ajayi foul on Maguire after reviewing the footage on the pitchside monitor.
Johnstone denied Mason Greenwood before Darnell Furlong cleared a Scott McTominay effort off the line, while at the other end David De Gea prevented Diagne securing a shock win with a superb double save.
Maguire went on his knees after former United goalkeeper Johnstone tipped his stoppage-time header on to a post.
Having been top of the Premier League just 19 days ago, Ole Gunnar Solskjaer’s side are now seven points behind Manchester City.
This article was most recently revised and updated 2 years ago