Middlesbrough recorded their sixth successive home victory with a win against struggling Derby that moved them into the Championship play-off spots.
The home side took the lead when Isaiah Jones' low cross was turned into his own net by Lee Buchanan but Max Bird levelled with a crisp volley from distance after Boro failed to clear a set-piece.
Chris Wilder's men took the game away from the Rams with two quick-fire goals before the break from Aaron Connolly and Matt Crooks, with the in-form Jones instrumental in the creation of both.
Folarin Balogun teed up substitute Duncan Watmore to wrap up the points late on.