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:
9. Marcus Tavernier - 4
Beavered away in midfield but looked out of his depth against his skilful Leeds counterparts. 4 Photo: Frank Reid
10. Ashley Fletcher - 5
Made some decent runs into the channels but received little support as Boro failed register a shot on target. 5 Photo: Jan Kruger
11. Britt Assombalonga - 4
Held the ball up a couple of times but didn’t look fully fit as Leeds regularly played out from the back. 4 Photo: Getty Images
12. Ben Liddle - 5
(for Wing, 70) A difficult game to make his debut but gave a decent account of himself during his brief cameo. 5 Photo: George Wood