An early header from Sean Morrison and Josh Murphy’s brace handed the Bluebirds victory at the Riverside Stadium, with Britt Assombalonga’s free-kick merely a consolation.
But who caught the eye for Boro? Joe Nicholson has dished out his marks from the defeat - and you can scroll down to see how he rated the individual displays:
5. George Friend
Booked early on for a foul on Glatzel. Vocal throughout yet Boro’s defence was picked apart on several occasions. 5 Photo: Gareth Copley
6. George Saville
Made a few important blocks but struggled to get to grips with the game in midfield against Joe Ralls and Will Vaulks. 5 Photo: COPYRIGHT (C) FRANK REID 20187
7. Jonny Howson
Covered plenty of ground in midfield on a tough afternoon against a well-balanced Cardiff side. Sent off for a late challenge in the closing stages. 4 Photo: James Chance
8. Djed Spence
A few early flashes in an advanced wide right position. Faded after switching flanks in the first half. 5 Photo: Justin Setterfield