Rotherham United claimed back-to-back away wins in the Championship for the first time under Paul Warne.
Debutant, Ryan Giles capped off a great showing from Rotherham after a Matt Crooks half volley and a Michael Smith penalty.
Rotherham last beat Middlesbrough on home spoil in 1965, back at the old Ayresome Park.
Middlesbrough has chances of their own throughout the game, but bodies on the line and a commanding performance from Jamal Blackman in the Millers goal carried the three points back home.
Crooks opened the scoring and became the first Millers player to score in Middlesbrough since Emlyn Hughes all those years ago. The ball was initially cleared by Paddy McNair, but the foot of ‘Tree’ caught it on the half volley for the only goal of the first half.
Michael Smith has one of the games of his career in the first half and, after Michael Ihiekwe was felled in the area in the final stages the second half, scored from the spot, sending Bettinelli the wrong way.
A slight hiccup in communication between Captain Richard Wood and Blackman nearly left egg on the faces, but luckily ball trickled agonisingly wide.
With two minutes left of normal time, new boy Giles replaced Jamie Lindsay. A smart break out saw Wiles with the ball and Giles to his left, the two combined and Giles placed the ball through the legs of the ‘Boro keeper.
Agent Warnock. That is all.
Teams:
Middlesbrough: Bettinelli, Morsy, Assombalonga© (Akpom 67), N Wood, Howson (Johnson 82), McNair, Watmore, Roberts (Coulson), Saville, Bola (Fletcher), Spence (Wing 67)
(Unused Subs: Archer, Hall, Hackney)
Rotherham: Blackman, S MacDonald (Hirst 67), Wood©, Wiles, Lindsay (Giles 88), Harding, Ihiekwe, A MacDonald, Olosunde, Smith, Crooks (Robertson 84)
(Unused Subs: Johansson, Thompson, Tilt, Clarke, Ladapo)
Goals: (Crooks 43), (Smith 78P), (Giles 90+1)
Referee: Michael Sailsbury
The Wandering Yorkshireman 