Derby twice came from behind to overcome Sheffield Wednesday 3-2 at the iPro Stadium and move two points clear at the top of the Sky Bet Championship.
Defender Jake Buxton twice headed the Rams level from corners after Lewis McGugan and Will Keane had put the Owls ahead.
And Darren Bent completed the comeback with a penalty after goalkeeper Kieren Westwood was sent off for bringing down Tom Ince.
Wednesday head coach Stuart Gray was disappointed at letting good positions slip away and the sending-off of Westwood, saying: “We have been doing very well in our own box so to concede three goals from set plays was very disappointing.
“Derby are a good side and I think they will get promoted and because they put you under so much pressure we have got lads making decisions with tired minds, but to get ourselves 2-1 up gave us something to build on.
“The disappointing thing in the dressing room was we know how well we have defended our 18-yard box and it’s very rare for us to conceded goals from set plays. And then for Westy (Westwood) to get sent off, I think that was a bit harsh.”