FULL-TIME: Bristol City 0, Derby County 2
Bristol City's Ashton Gate woes continued as they suffered yet another npower Championship defeat on home soil.
First-half goals from Jeff Hendrick and Craig Bryson earned Derby all three points and left the Robins languishing in the relegation zone.
City have now failed to win in BS3 in nine attempts since beating Cardiff in August and their poor home form is preventing them moving clear of trouble.
Substitute Steven Davies and centre-back Liam Fontaine had City's best chances after the break, but both were foiled by Rams keeper Adam Legzdins.
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The only positive for City was the return to action of left-back Greg Cunningham, who came on as a substitute shortly before the break to make his first appearance in three months.
Derby's poor away record of eight points from a possible 30 exactly mirrored City's meagre return from 10 games played at Ashton Gate this season.
Beaten in their last four outings on the road, the Rams nevertheless made the better start and almost went in front in the sixth minute, Michael Jacobs meeting Bryson's deep cross with a flick that drew a fine one-handed save from Tom Heaton.
City were slow out of the blocks, but gathered some momentum when Sam Baldock beat Derby's offside trap and tested Legzdins with a low drive that came back off the keeper's legs.
Ryan Taylor's ability to hold the ball up was causing the visitors problems and his neat set-up invited Albert Adomah to try his luck from inside the penalty area. But the winger's shot went high and wide.
Derby proved just as wasteful, Paul Coutts electing to pass to Bryson instead of shooting when he only had Heaton to beat.
But the Rams made no mistake when opportunity came knocking 11 minutes before the break. Jacobs swung a cross over from the left flank and Hendrick was allowed a free run to turn the ball in at the near post from six yards.
Derby doubled their lead in identical circumstances two minutes later. Gareth Roberts sent over a cross from the left and Bryson left red-shirted defenders trailing in his wake to beat Heaton with a close-range header at the front post.
City tried to respond and Adomah played in Sam Baldock, only for the striker to direct his shot straight at Legzdins, who made a smart save.
Derby looked the more likely to score and right-back John Brayford cut inside and sent a venomous left-footed drive inches wide of Heaton's upright.
Robins boss Derek McInnes made a change shortly before half-time, withdrawing the ineffectual Matthew Bates, moving Liam Fontaine to centre-back and sending on left-back Cunningham for his first appearance since September.
And another change came at the start of the second period, Steven Davies coming on for Taylor to face his former club.
But City were still unable to penetrate a well-organised Rams defence and Legzdins scarcely had a save to make as the home side huffed and puffed.
Instead, it was Derby who came closest to scoring, Coutts surging into the penalty area and finding Jacobs, whose shot looped inches wide with Heaton struggling to make his ground.
McInnes played his final roll of the dice 19 minutes from time, sending on Jon Stead for Bryan and switching to a 4-3-3 system.
Davies tested Legzdins with a curling shot and the keeper then displayed sharp reactions to palm away Fontaine's header at the back post.
City (4-4-2): Heaton; Foster, Bates (Cunningham 44), McManus, Fontaine; Adomah, Elliott, Danns, Bryan (Stead 71); Baldock, Taylor (Davies 47).
Derby (4-4-1-1): Legzdins; Brayford, Keogh, O'Brien (Freeman 87), Roberts; Coutts, Hendrick, Hughes, Jacobs; Bryson (Davies 66); Sammon.
Referee: Andy D'Urso (Essex)