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:
. BIRMINGHAM, ENGLAND - DECEMBER 19: George Saville of Middlesborough celebrates after scoring their sides second goal during the Sky Bet Championship match between Birmingham City and Middlesbrough at St Andrew's Trillion Trophy Stadium on December 19, 2020 in Birmingham, England. The match will be played without fans, behind closed doors as a Covid-19 precaution. (Photo by Laurence Griffiths/Getty Images)
George Saville of Middlesborough celebrates after scoring. Photo: Laurence Griffiths
. 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
. 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
. 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
. 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
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