Bottom club Plymouth stunned promotion-chasing Cardiff with a smash-and-grab raid at the Cardiff City Stadium.
Gary Sawyer struck six minutes from time with a deflected effort after Paul Quinn's poor clearance.
Cardiff had chances to take all three points but missed chances through Peter Whittingham, Michael Chopra, Jay Bothroyd and Joe Ledley late on.
Argyle keeper Romain Larrieu also denied Mark Hudson's header as the visitors ended a run of five defeats.
It was new boss Paul Mariner's first win in his third game in charge and his side's first goal in over 500 minutes of football.
Cardiff keeper David Marshall had no chance with the goal though after Sawyer's shot deflected off Hudson.
He did also keep Cardiff in it in the first half denying Alan Judge, but was the quieter of the two keepers as Cardiff blew the chance to close the gap on the Championship's top two.
Frenchman Larrieu turned Hudson's header over the bar and then sent Whittingham's 20-yard effort to safety.
Bothroyd then narrowly put the ball over the bar from inside the box before Chopra wasted a good chance.
Cardiff piled on further pressure after Sawyer's goal, but Ledley drove just wide from 12 yards as Plymouth held on for a vital win as they climbed off the bottom and attempt to reach Championship safety.
Cardiff City manager Dave Jones
Cardiff manager Dave Jones:
"These are the type of games you have to see out and we had the chances to do that yet we never showed the creativity we are capable of and we have been caught by a sucker punch.
"This division is a difficult one but we should still have been good enough to win and it is very disappointing to lose a game like this.
"You could see it coming and three individual errors led to the goal. They were waiting for one opportunity and when it came they took it.
Plymouth manager Paul Mariner
Plymouth manager Paul Mariner:
"We worked very hard for that result but the signs have been there for a couple of weeks.
"The players want to get this club out of the mess we are in and we knew we would get a resilient performance from them but three points is a wonderful result.
"To keep a clean sheet against such a high powered attacking force as Cardiff have is a magnificent effort.
"We haven't scored for a long time but you have to go back to the basics and that is what we have done today."
90:00+5:59 The referee brings the game to a close.
90:00+4:59 Handball decision goes against Ashley Barnes. David Marshall takes the indirect free kick.
90:00+3:44 Foul by Ross McCormack on Kari Arnason, free kick awarded. Indirect free kick taken by Romain Larrieu.
90:00+2:57 Substitution Ashley Barnes comes on in place of Rory Fallon.
90:00+2:00 Reda Johnson gives away a free kick for an unfair challenge on Ross McCormack. The ball is swung over by Ross McCormack, Shot
by Joe Ledley from deep inside the penalty area misses to the right of the goal.
90:00+0:28 Outswinging corner taken from the right by-line by Luke Summerfield, clearance by Anthony Gerrard.
89:43 Short corner taken by Luke Summerfield from the right by-line.
86:16 Corner taken by Ross McCormack, clearance by Rory Fallon.
84:43 Peter Whittingham produces a drilled left-footed shot from 18 yards. Save by Romain Larrieu.
84:43 Substitution Adam Matthews is brought on as a substitute for Paul Quinn.
84:43 Kari Arnason is penalised for handball and concedes a free kick.
83:28 GOAL - Gary Sawyer:Cardiff 0 - 1 Plymouth Gary Sawyer scores a goal from inside the area to the bottom right corner of the goal. Cardiff 0-1 Plymouth.
82:55 Jamie Mackie fouled by Anthony Gerrard, the ref awards a free kick. Karl Duguid takes the free kick.
81:22 Jay Bothroyd fouled by Kari Arnason, the ref awards a free kick. Ross McCormack produces a strike on goal direct from the
80:42 Rory Fallon challenges Anthony Gerrard unfairly and gives away a free kick. David Marshall takes the indirect free kick.
77:05 Free kick awarded for an unfair challenge on Ross McCormack by Kari Arnason. Gavin Rae takes the direct free kick.
76:01 Corner from the left by-line taken by Ross McCormack, Effort on goal by Paul Quinn from deep inside the penalty area misses
to the right of the goal.
74:23 Effort from outside the penalty box by Ross McCormack goes wide right of the target.
71:23 Substitution Yoann Folly is brought on as a substitute for Alan Judge.
71:23 The official flags Ross McCormack offside. Romain Larrieu takes the indirect free kick.
71:02 Substitution Michael Chopra leaves the field to be replaced by Ross McCormack.
70:03 The ball is delivered by Kelvin Etuhu.
68:37 The ball is crossed by Peter Whittingham, Romain Larrieu makes a save.
66:57 Booking Carl Fletcher goes into the referee's book.
66:48 Carl Fletcher gives away a free kick for an unfair challenge on Joe Ledley. Indirect free kick taken by Mark Hudson.
66:19 Foul by Anthony Gerrard on Rory Fallon, free kick awarded. Alan Judge restarts play with the free kick.
65:45 Anthony Gerrard delivers the ball, Close range shot by Jay Bothroyd goes wide of the right-hand upright.
64:53 Foul by Kari Arnason on Michael Chopra, free kick awarded. Peter Whittingham delivers the ball from the free kick left-footed
from right wing, save by Romain Larrieu.
63:30 Substitution Chris Burke leaves the field to be replaced by Kelvin Etuhu.
63:30 The referee blows for offside. Kari Arnason takes the free kick.
62:39 Peter Whittingham takes the inswinging corner, Anthony Gerrard has a headed effort at goal from close range which goes wide
of the left-hand post.
62:29 The ball is swung over by Chris Burke, Kari Arnason makes a clearance.
59:51 The ball is crossed by Gary Sawyer.
58:13 The ball is delivered by Michael Chopra.
57:42 Luke Summerfield produces a right-footed shot from just outside the penalty box that misses to the left of the goal.
56:03 The offside flag is raised against Jay Bothroyd. Kari Arnason restarts play with the free kick.
53:35 Free kick awarded for a foul by Luke Summerfield on Chris Burke. David Marshall takes the indirect free kick.
52:01 Outswinging corner taken from the right by-line by Alan Judge, Header on goal by Rory Fallon from inside the box goes harmlessly
over the target.
51:00 Free kick awarded for a foul by Joe Ledley on Alan Judge. Alan Judge crosses the ball from the free kick right-footed from
right wing, clearance made by Anthony Gerrard.
49:40 Foul by Rory Fallon on Anthony Gerrard, free kick awarded. Indirect free kick taken by Anthony Gerrard.
48:12 Booking The referee cautions Romain Larrieu for dissent.
47:53 Effort on goal by Michael Chopra from just outside the area goes harmlessly over the target.
46:45 Effort on goal by Jay Bothroyd from just inside the area clears the bar.
46:07 Michael Chopra takes a shot. Kari Arnason gets a block in.
45:01 The match restarts for the second half.
45:00+5:01 The ref blows to signal half-time.
45:00+3:39 Carl Fletcher fouled by Jay Bothroyd, the ref awards a free kick. Romain Larrieu takes the free kick.
45:00+1:58 Rory Fallon concedes a free kick for a foul on Kevin McNaughton. Free kick taken by Anthony Gerrard.
45:00+0:02 Inswinging corner taken left-footed by Peter Whittingham.
44:26 Peter Whittingham takes a inswinging corner to the near post, Karl Duguid manages to make a clearance.
42:15 Free kick awarded for an unfair challenge on Michael Chopra by Kari Arnason. Peter Whittingham shoots direct from the free
40:44 The ball is crossed by Chris Burke.
39:47 The referee gives a free kick against Alan Judge for handball. Free kick taken by Kevin McNaughton.
38:34 Alan Judge takes a outswinging corner from the right by-line to the near post, clearance by Mark Hudson.
37:55 Chris Burke gives away a free kick for an unfair challenge on Chris Clark. Direct free kick taken by Gary Sawyer.
35:34 Unfair challenge on Chris Burke by Gary Sawyer results in a free kick. Peter Whittingham crosses the ball in from the free
kick, clearance made by Karl Duguid.
35:02 Alan Judge takes a shot. Save made by David Marshall.
34:46 The ball is crossed by Kari Arnason, Kevin McNaughton makes a clearance.
33:53 Michael Chopra is ruled offside. Free kick taken by Romain Larrieu.
32:36 Booking The referee shows Jay Bothroyd a yellow card.
32:13 Jay Bothroyd challenges Karl Duguid unfairly and gives away a free kick. Free kick taken by Karl Duguid.
29:23 Unfair challenge on Gavin Rae by Rory Fallon results in a free kick. Anthony Gerrard takes the direct free kick.
28:18 Booking Rory Fallon is shown a yellow card for unsporting behaviour.
27:37 Rory Fallon concedes a free kick for a foul on Anthony Gerrard. Indirect free kick taken by David Marshall.
27:02 Centre by Chris Burke, free kick awarded for an unfair challenge on Kari Arnason by Jay Bothroyd. Romain Larrieu restarts
play with the free kick.
24:12 Peter Whittingham takes a inswinging corner to the near post, Romain Larrieu makes a save.
24:05 Centre by Chris Burke, blocked by Gary Sawyer.
18:50 The referee penalises Jamie Mackie for handball. Free kick taken by David Marshall.
17:09 Booking Reda Johnson receives a caution.
16:40 Foul by Reda Johnson on Michael Chopra, free kick awarded. Peter Whittingham takes the direct free kick.
16:04 Gavin Rae takes a shot. Save by Romain Larrieu.
15:34 Short corner taken by Jay Bothroyd, Chris Burke delivers the ball, clearance made by Reda Johnson.
14:59 Peter Whittingham takes a shot. Save by Romain Larrieu.
12:22 Peter Whittingham delivers a pass corner to short.
12:08 Mark Hudson takes a shot. Save by Romain Larrieu.
11:39 Unfair challenge on Jay Bothroyd by Kari Arnason results in a free kick. Direct free kick taken by Peter Whittingham.
Correction - 4:52 Gavin Rae gives away a free kick for an unfair challenge on Rory Fallon. Kari Arnason crosses the ball, Effort on goal by
Reda Johnson from deep inside the penalty area misses to the right of the goal.
4:52 Rory Fallon fouled by Gavin Rae, the ref awards a free kick. The ball is swung over by Kari Arnason, Reda Johnson has an effort
at goal from deep inside the area missing to the right of the goal.
3:35 Free kick awarded for a foul by Jay Bothroyd on Gary Sawyer. Free kick taken by Romain Larrieu.
2:35 Foul by Rory Fallon on Kevin McNaughton, free kick awarded. Free kick taken by Mark Hudson.
1:59 Jamie Mackie handles the ball and concedes a free kick. Free kick taken by David Marshall.
1:31 The referee blows for offside. Kari Arnason takes the indirect free kick.
1:02 Unfair challenge on David Marshall by Rory Fallon results in a free kick. Free kick taken by David Marshall.
0:00 The referee gets the game started.
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