Adam Phillips scored twice as Barnsley came from behind to beat promotion rivals Derby 2-1.
Sonny Bradley put the visitors ahead in the Sky Bet League One contest but the hosts responded impressively.
Derby were the first to threaten when Conor Hourihane capitalised on a defensive error from Donovan Pines and fired in a shot which was deflected wide.
The resulting corner saw Eiran Cashin’s header cleared off the line and then Hourihane’s 18th-minute corner was met by Bradley, whose header found the net.
Barnsley equalised 15 minutes later when an attempted clearance fell to Phillips, who chested the ball down and hammered a volley just inside Joe Wildsmith’s right-hand post from the edge of the area.
Barnsley’s Nicky Cadden had a shot comfortably saved soon after the restart but Phillips was on target again to score the winner in the 66th minute, meeting Cadden’s corner with a near-post header.
Max Bird fired in a shot which flashed wide as the visitors looked for a quick response – but they were unable to find a leveller.
The result takes Barnsley to within three points of second-placed Derby following a run of just one defeat in their last 15 games.