A goal in either half from Darren Bent and Will Hughes put Derby County in to the next round of the FA Cup - but it was far from comfortable against Chesterfield.
The Spireites gave their supporters plenty to shout about with a determined display from the first to the last whistle against their Championship opponents.
Paul Cook’s Blues were far from second best in the fourth round tie but were undone by a lapse of concentration from a set piece that allowed the Rams in.
A couple of superb stops by Tommy Lee when left one-on-one with ex-England international, Bent, kept Chesterfield in the game before Hughes killed it late on.
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