Aaron Webster's early goal gave Burton Albion victory and extended League Two leaders Chesterfield's winless run to four games.
Webster stunned the visitors by curling home his ninth goal of the season from 20 yards in the fifth minute.
Spirites goalkeeper Tommy Lee had to twice deny Calvin Zola before Burton's Adam Legzdins saved from Dwayne Mattis.
Zola and Webster had further chances after the break, while Chesterfield's Jordan Bowery fired wired late on.
The win sees Burton climb out of the relegation zone, while Chesterfield remain five points ahead of second-placed Wycombe, who have two games in hand.
Burton Albion manager Paul Peschisolido told BBC Radio Derby: "We looked like the only side who were going to win the game.
"We've done it against other teams too but if you don't score at the right times they can get one opportunity, the ball goes over the top and they get one in.
"This time it went in the side netting, but we've got to start to kill teams off."
90:00+3:31 Close range shot by Jordan Bowery goes wide of the left-hand post.
87:24 Foul by Scott Boden on John McGrath, free kick awarded. Free kick taken by Adam Legzdins.
86:58 Substitution Greg Pearson on for Calvin Zola.
86:20 Calvin Zola takes a shot.
85:01 Free kick awarded for an unfair challenge on Drew Talbot by Paul Boertien. Dean Holden restarts play with the free kick.
85:01 Booking Aaron Webster goes into the referee's book.
84:08 A cross is delivered by Deane Smalley, Jordan Bowery has a headed effort at goal from close in which goes wide left of the goal.
Correction - 83:14 Substitution (Burton Albion) makes a substitution, with Darren Moore coming on for Nathan Stanton.
83:14 Substitution Darren Moore comes on in place of Nathan Stanton.
80:30 Dean Holden produces a cross, save made by Adam Legzdins.
79:49 Jordan Bowery takes a shot. Nathan Stanton gets a block in.
79:10 Sam Winnall gives away a free kick for an unfair challenge on Dean Holden. Tommy Lee takes the free kick.
77:51 Inswinging corner taken right-footed by Danny Whitaker from the left by-line, Tony James manages to make a clearance.
77:16 Sam Winnall takes a shot. Simon Ford gets a block in.
75:59 Jacques Maghoma delivers the ball.
71:54 The referee blows for offside. Scott Griffiths takes the indirect free kick.
71:18 Danny Whitaker takes a outswinging corner from the right by-line played to the near post, save by Adam Legzdins.
70:13 Effort from the edge of the box by Sam Winnall goes wide of the right-hand upright.
67:58 Jacques Maghoma takes a shot. Simon Ford gets a block in. Andrew Corbett takes a shot. Ian Breckin gets a block in. Calvin Zola takes a shot. Save by Tommy Lee. Aaron Webster has an effort at goal from just inside the box that misses to the right of the goal.
66:40 Unfair challenge on Scott Griffiths by Sam Winnall results in a free kick. Direct free kick taken by Tommy Lee.
65:27 Substitution Scott Boden comes on in place of Derek Niven.
62:58 Substitution Sam Winnall joins the action as a substitute, replacing Russell Penn.
61:48 Nathan Stanton gives away a free kick for an unfair challenge on Jordan Bowery. Free kick taken by Danny Whitaker.
61:11 Adam Bolder takes a shot. Blocked by Ian Breckin. Outswinging corner taken from the left by-line by John McGrath, Mark Allott makes a clearance.
59:49 Substitution Craig Davies goes off and Jordan Bowery comes on.
56:30 Centre by Adam Bolder.
54:21 The ball is swung over by Andrew Corbett.
53:08 Foul by Ian Breckin on Calvin Zola, free kick awarded. John McGrath takes the free kick.
50:57 The official flags Craig Davies offside. Indirect free kick taken by Adam Legzdins.
49:36 Shot by John McGrath. Simon Ford gets a block in.
49:01 The ball is crossed by Danny Whitaker, Deane Smalley has a header from close range and clears the crossbar.
48:44 Mark Allott takes a shot. Tony James gets a block in.
47:32 Ian Breckin challenges Calvin Zola unfairly and gives away a free kick. John McGrath takes the free kick.
47:32 Booking Ian Breckin is given a yellow card.
47:01 The offside flag is raised against Calvin Zola. Tommy Lee takes the free kick.
46:41 Dean Holden concedes a free kick for a foul on Paul Boertien. Paul Boertien restarts play with the free kick.
Correction - 45:25 The offside flag is raised against Calvin Zola. Ian Breckin restarts play with the free kick.
45:25 The referee blows for offside against Calvin Zola. Tommy Lee takes the free kick.
Correction - 45:01 Substitution Ian Breckin replaces Dwayne Mattis.
45:01 The referee blows his whistle to start the second half.
45:01 Substitution Ian Breckin joins the action as a substitute, replacing Dwayne Mattis.
Half Time
45:00+1:58 The first half comes to an end.
45:00+1:21 Drew Talbot crosses the ball, save by Adam Legzdins.
43:53 Corner taken by John McGrath from the right by-line, save by Tommy Lee.
43:17 Inswinging corner taken left-footed by John McGrath played to the near post.
40:36 Russell Penn takes a shot. Blocked by Dwayne Mattis.
39:54 Adam Bolder concedes a free kick for a foul on Mark Allott. Free kick taken by Simon Ford.
39:20 Shot by Calvin Zola from deep inside the penalty area misses to the left of the target.
38:27 Effort from outside the penalty area by Russell Penn goes wide left of the target.
35:51 Aaron Webster takes a shot. Danny Whitaker gets a block in. Calvin Zola produces a right-footed shot from deep inside the penalty box which goes wide of the left-hand post. Corner from the left by-line taken by John McGrath, clearance made by Danny Whitaker. The ball is crossed by Russell Penn, Calvin Zola takes a shot.
35:07 Andrew Corbett fouled by Craig Davies, the ref awards a free kick. Adam Legzdins takes the free kick.
33:42 Aaron Webster gives away a free kick for an unfair challenge on Drew Talbot. Direct free kick taken by Derek Niven. Deane Smalley produces a header from inside the area that goes over the bar.
30:40 John McGrath concedes a free kick for a foul on Derek Niven. Direct free kick taken by Mark Allott.
29:41 Dwayne Mattis takes a shot. Save made by Adam Legzdins. Drew Talbot takes the outswinging corner, clearance by Tony James.
29:18 Corner taken right-footed by Danny Whitaker from the right by-line, clearance made by Tony James.
28:33 Drew Talbot decides to take a short corner.
27:52 Calvin Zola takes a shot. Save by Tommy Lee.
26:57 Effort from the edge of the area by Drew Talbot goes wide of the left-hand post.
26:17 Craig Davies challenges Tony James unfairly and gives away a free kick. Tony James takes the free kick.
23:52 Foul by Russell Penn on Scott Griffiths, free kick awarded. Direct free kick taken by Mark Allott.
23:11 Jacques Maghoma produces a right-footed shot from the edge of the area and misses to the left of the target.
20:02 The referee blows for offside against Craig Davies. Nathan Stanton takes the indirect free kick.
18:50 Scott Griffiths delivers the ball, Craig Davies takes a shot. Save by Adam Legzdins.
18:15 Calvin Zola gives away a free kick for an unfair challenge on Simon Ford. Direct free kick taken by Simon Ford.
18:01 The referee blows for offside. Free kick taken by Adam Legzdins.
15:39 Calvin Zola takes a shot. Save by Tommy Lee.
15:07 Craig Davies concedes a free kick for a foul on Tony James. Adam Legzdins takes the direct free kick.
10:28 Unfair challenge on Russell Penn by Scott Griffiths results in a free kick. Free kick taken by Adam Bolder.
7:48 Jacques Maghoma concedes a free kick for a foul on Dean Holden. Tommy Lee restarts play with the free kick.
6:12 Free kick awarded for an unfair challenge on Danny Whitaker by Adam Bolder. The free kick is delivered right-footed by Danny Whitaker from left wing, Aaron Webster makes a clearance. Short corner taken by Drew Talbot.
4:41 The assist for the goal came from Jacques Maghoma.
4:41 GOAL - Aaron Webster:Burton Albion 1 - 0 Chesterfield A goal is scored by Aaron Webster from just outside the penalty area to the bottom left corner of the goal. Burton Albion 1-0 Chesterfield.
4:04 The ball is delivered by Danny Whitaker, Craig Davies produces a header from inside the six-yard box that clears the bar.
3:34 Corner from the left by-line taken by Danny Whitaker, Tony James manages to make a clearance.
2:36 Effort from the edge of the area by Jacques Maghoma goes wide of the left-hand upright.
0:40 Paul Boertien gives away a free kick for an unfair challenge on Deane Smalley. Drew Talbot takes the direct free kick.
0:19 Nathan Stanton concedes a free kick for a foul on Deane Smalley. Free kick taken by Simon Ford.
0:00 The ref blows the whistle to begin the match.
Live text and data provided by The Press Association.
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