Derby piled pressure on Nottingham Forest manager Steve McClaren with a 2-1 victory over their East Midlands rivals despite playing almost the entire match at the City Ground with 10 men.
Rams teenager Jeff Hendrick hit the winning goal midway through the second half to leave former England boss McClaren still searching for his first home win in the npower Championship.
Frank Fielding's second-minute red card provided a dramatic start as he felled Ishmael Miller and Andy Reid scored the resulting penalty before Jamie Ward equalised.
Referee Scott Mathieson had little choice but to send off the England Under-21 goalkeeper. Miller latched on to a flick inside the Derby box and was clattered by the onrushing Fielding as he bore down on goal just six yards out.
There was a delay before Reid could take the penalty while Derby reorganised. Adam Legzdins came on in goal for his first league appearance of the season. Tomasz Cywka, on his first league outing and first start of the campaign, was the unlucky man to be sacrificed.
Legzdins was sent the wrong way from the spot by Reid who claimed his first goal since rejoining Forest in the summer.
The manner of Derby's equaliser in the 29th minute was just as dramatic.
As Forest full-back Chris Cohen lay injured on the ground midway inside the Derby half, following an innocuous-looking clash with Mark O'Brien, the visitors worked the ball out to Ward on the left wing amid a chorus of boos from the home supporters, calling for play to stop.
Ward evaded a challenge from Radoslaw Majewski to reach the byline, where he knocked the ball around Wes Morgan and collected it on the other side of the burly centre-half before squeezing a low shot past Lee Camp from an acute angle.
Hendrick then blasted home the winning goal after 72 minutes. Forest failed to clear a corner and the ball broke to the teenager who fired a right-footed shot into the bottom of the net from 25 yards.
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