Goals from former Boro striker Patrick Bamford, Helder Costa and a brace from Mateusz Klich condemned the Teessiders to their heaviest defeat of the season. Our Boro writer Joe Nicholson has dished out his player ratings following the match. Scroll down and flick through our gallery to see his marks:
5. Paddy McNair - 4
Moved back into defence. Turned his back for the fourth goal and was visibly struggling in the latter stages. 4 Photo: Getty Images
6. Marc Bola - 4
Had a difficult task on the left, especially in the first half when Costa and Klich were combining well for the hosts. 4 Photo: Frank Reid
7. Lewis Wing - 3
Allowed Costa to get the better of him for the third goal and was a passenger for most of the match. 3 Photo: Getty Images
8. George Saville - 4
Returned from suspension but the game passed him by as Leeds dominated the midfield battle. 4 Photo: George Wood