Plymouth Argyle beat Albion 2-1 at Home Park in the Sky Bet Championship on Saturday afternoon.
Ryan Hardie’s late brace overturned Jayson Molumby’s effort, earning the Pilgrims all three points.
The Baggies return to The Hawthorns next weekend, hosting Sheffield Wednesday.
Tony Mowbray named an unchanged XI for the Devon trip, though there were three alterations to the bench as Kyle Bartley, Jayson Molumby and Harry Whitwell replaced Caleb Taylor (loaned out), Uros Racic (loan terminated) and Oliver Bostock.
Despite plenty of intent from both teams, chances did not begin to properly arrive until midway through the first period. Alex Mowatt fired an Albion opportunity over, while Argyle’s Callum Wright saw a header well blocked by Mason Holgate down the other end.
The Baggies created further openings before the interval, but Callum Styles and John Swift could only shoot wide, and Mikey Johnston’s deflected shot was comfortably stopped, leaving us level at half-time.
Straight after the restart former Plymouth loanee Alex Palmer had to halt Matthew Sorinola when he raced in on goal - the visiting No.1 gathering the ball bravely around six yards out.
Then it was Argyle’s goalkeeper, Conor Hazard, who kept proceedings goalless, pulling off an excellent double save and denying Torbjorn Heggem’s overhead kick as well as Johnston’s follow-up.
Albion even netted in the 62nd minute when Grady Diangana tucked home, however the assistant referee correctly judged him to be narrowly offside.
Finally, though, the Baggies went ahead. Captain Jed Wallace brilliantly drove into the area and pulled back for substitute Molumby to tap in.
However, Plymouth responded almost instantly - winning a penalty for an alleged Styles handball, which Hardie converted.
And they won it two minutes from time. Hardie’s initial attempt was blocked, yet he finished the rebound, leaving them to claim the spoils.
Albion: Palmer; Furlong, Holgate, Heggem, Styles; Swift (Molumby 63), Mowatt; Fellows (Price 63), Diangana (Cole 90+1), Johnston (Grant 63); Wallace (Diakite 84).
Substitutes: Wildsmith, Bartley, Frabotta, Whitwell.