Full-time: James O'Connor and Nathan Tyson on target as Derby County beat Barnsley 2-0
DERBY County made it back-to-back home wins with a 2-0 victory over Barnsley at Pride Park Stadium.
James O'Connor's first goal for the club put the Rams ahead after 68 minutes and substitute Nathan Tyson sealed the three points with a late strike.
Rams boss Nigel Clough named an unchanged starting line-up following Saturday's 4-1 victory over Blackpool.
Jake Buxton returned to the squad after serving a one-match ban but had to settle for a place on the bench, so O'Connor kept his place at the heart of the defence.
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Former Derby forward Tomasz Cywka started for Barnsley, whose manager Keith Hill made four changes to the side that lost 1-0 at Hull City.
The Rams created some early pressure, with Conor Sammon sending an improvised flick over the bar from Gareth Roberts' cross.
John Brayford's throw then released Paul Coutts down the right but his low centre arrived too quickly for Theo Robinson in the middle and the striker failed to make meaningful contact with the ball.
The visitors went close in the 14th minute when centre-back Scott Wiseman nicked possession off Robinson, then beat Coutts and Richard Keogh before delivering a low cross which Chris Dagnall turned wide at the near post.
Eight minutes later, Stephen Dawson's cut-back from the right reached Jacob Mellis but the Barnsley midfielder could not keep his shot down.
Moments later, space opened up through the middle for Jeff Hendrick but his firmly-struck drive was straight at keeper Luke Steele.
Keogh fired wide from the edge of the area, while Sammon could not connect with Brayford's ball in from the right.
Adam Legzdins had to tip over a rising effort from Cywka, who then shot wide after latching on to a punch from the Rams keeper.
Mellis cleared the bar again from a decent position following a swift break from Kelvin Etuhu.
A nice build-up from Derby in the 42nd minute ended with a sweet hit from Will Hughes 20 yards out, which was beaten away by Steele.
Cywka had the first chance of the second half, his angled drive deflected into the side-netting.
Derby were pressing hard but were becoming frustrated in the final third.
Barnsley threatened on the break and, after another surging run from Wiseman, Dagnall's fierce strike was beaten away by Legzdins.
Coutts' free kick from just outside the area was seen late by Steele but the keeper managed to palm the ball away from danger.
The Rams took the lead from a set piece in the 68th minute.
Hughes delivered a teasing free kick from the left and Keogh's header clipped the inside of the far post.
The ball broke loose and O'Connor was on hand to force it in from virtually on the line.
While the visitors pushed for an equaliser, Derby might have added to their lead.
Tyson, with his first touch after replacing Sammon, saw a shot deflected on to the roof of the net.
The resulting corner, taken by another substitute, Michael Jacobs, flashed across goal, just evading the run of Keogh.
Derby had a let-off in the 89th minute when Tom Kennedy's corner found Stephen Dawson unmarked at the far post but he volleyed over.
The hosts made sure of the win soon after when Craig Bryson found Tyson, whose 20-yard screamer flew past Steele.
DERBY COUNTY: Legzdins, Brayford, Keogh, O'Connor, Roberts, Coutts (Freeman, 90+2), Hendrick, Bryson, Hughes, Robinson (Jacobs, 76), Sammon (Tyson, 84). Other subs: Deeney (gk), M O'Brien, Buxton, Davies.
BARNSLEY: Steele, Kennedy, Wiseman, McNulty, Golbourne, Cranie, Etuhu (J O'Brien, 79), Dawson, Mellis (Harewood, 79), Cywka (Done, 72), Dagnall. Other subs: Alnwick (gk), Hassell, Foster, Silva.
REFEREE: D Coote (Nottingham).