Boro fell behind to Maxime Colin’s opener but took the lead after first-half goals from Britt Assombalonga and George Saville. Lewis Wing then scored twice in the second half to complete the scoring.
Our Middlesbrough writer Joe Nicholson has dished out his marks from the match – scroll down and flick through the pages of our picture gallery to see them:
1. Marcus Bettinelli - 7
Didn’t have much to do but made an important low save with his foot to deny Scott Hogan at 1-0. 7 Photo: Alex Pantling
2. Anfernee Dijksteel - 6
Struggled against the lively Jereme Bela in the first half but settled after the break as Boro’s defence stood firm. 6 Photo: Getty Images
3. Paddy McNair - 8
Swept up danger at the back and won the free-kick which led to Boro’s equaliser. Comfortable stepping out from the back. 8 Photo: Alex Pantling
4. Dael Fry - 7
Won the majority of his headers and stayed tight to Hogan when the ball was played into the Birmingham striker’s feet. 7 Photo: PA