Isaiah Jones put the hosts ahead in the 10th minute when he converted Chuba Akpom’s low cross.
Boro could have doubled their lead in the first half but were pegged back after the break when John Swift converted from Jed Wallace’s cutback.
The Teessiders will now prepare for next weekend’s trip to QPR.
Here’s how each Boro player fared at the Riverside Stadium against West Brom:
The Teessiders will now prepare for next weekend’s trip to QPR.
5. Isaiah Jones - 7
Scored the opener after arriving at the far post. Was a driving force on the right, yet his crossing was erratic. 7 Photo: Getty Images
6. Jonny Howson - 7
Made several interceptions in the first half as Boro pressed high up the pitch and pinned West Brom back. Provided extra cover when the visitors broke forward. 7 Photo: Robbie Jay Barratt - AMA
7. Matt Crooks - 6
Created some good overloads on the right in the first half when Boro were on the front foot. A few loose passes in midfield. 6 Photo: Robbie Jay Barratt - AMA
8. Ryan Giles - 8
Created the opening goal for Jones and was a constant threat on the left, delivering immediate crosses into the box. 8 Photo: Tony Marshall