Derby’s promotion hopes were dealt a major blow as they suffered a narrow 1-0 League One defeat at midtable Northampton.

The Cobblers’ first win in six games – and their first ever over Derby – came thanks to Sam Hoskins’ first-half strike, his 15th goal of the season.

Derby dominated possession early on and they should taken a 20th-minute lead but Martyn Waghorn side-footed the ball over with the goal at his mercy.

Northampton struck against the run of play midway through the first half when Louis Appere chased down a long ball and showed brilliant vision to pick out Hoskins, who volleyed first time into the bottom corner.

The visitors responded well but they could not find a leveller before half-time despite Ebou Adams twice going close, first denied by Sam Sherring’s goal-line clearance and then heading over when well placed.

Nathaniel Mendez-Laing almost converted Kane Wilson’s cross after the restart before Manny Monthe hit the post at the other end.

Derby applied plenty of late pressure but could find no way through Northampton’s resilient rearguard and their misery was compounded by a straight red card for Sonny Bradley in stoppage-time.