Blackpool strengthened their position in the Championship play-off places as Angel Martinez's first goal for the club gave them victory over Leeds.
The midfielder pounced on a loose ball to sink a spirited United side that finished with 10 men after Darren O'Dea was sent off for a second yellow card.
The home side were a more consistent threat throughout, although Leeds had their chances, largely from set-pieces.
The win leaves Blackpool four points ahead of seventh-placed Middlesbrough.
With only two games left to play, Ian Holloway's side are firm favourites to secure a place in the play-offs that would give them a chance of an instant return to the Premier League.
They were made to work hard for this win, though, by a hard-working and well-organised Leeds side, who came into the game off the back of a confidence-boosting 4-1 home win over Peterborough on Saturday.
Blackpool had the better of the first half, with Matt Phillips clipping a shot into the side-netting and Lomano Lua Lua thwarted by a superb save from United keeper Andy Lonergan, although Ross McCormack had a penalty shout waved away after he tumbled after getting the better of Stephen Crainey.
The visitors grew as a threat after the break and Robert Snodgrass had Matthew Gilks at full-stretch from a 67th-minute free-kick before substitute Luciano Becchio headed over from Adam Clayton's cross.
However, Blackpool won the game when Tom Ince failed to fully control a cross and Martinez was on hand to stab home.
Leeds' quest for an equaliser was ended when O'Dea saw red following a second bookable offence.
Blackpool boss Ian Holloway:
"I'm absolutely delighted, I'm on top of the world. That was as tough a game as you'll ever have, as tense a game as you'll ever have and I thought Leeds came here and made it really difficult.
"We showed a lot of belief when we needed to. I'm very, very pleased with everybody concerned.
"I don't care about Middlesbrough's result. It's about us, we've got Burnley next. We have to win. If we win one of our last two games we're guaranteed it."
Leeds boss Neil Warnock:
"I couldn't fault the effort, the effort was fantastic. It's just a matter of being patient really.
"I thought it was a penalty [for the McCormack incident] The ref said 'there was something not quite right' - I don't know what that means.
"We are lacking in certain areas and we can't do anything about that until the summer, so roll on the summer."
Live Text Commentary
Full Time The referee blows his whistle to end the game.90:00 +3:54
Ross McCormack takes a shot. Save by Matthew Gilks.90:00 +3:38
Robert Snodgrass takes a shot. Neal Eardley gets a block in.90:00 +1:51 Substitution
Substitution (Leeds) makes a substitution, with Paul Connolly coming on for Adam Clayton.90:00 +1:01
Barry Ferguson takes the free kick.90:00 +1:01 Booking
Booking Adam Clayton receives a yellow card for unsporting behaviour.90:00 +0:53
Adam Clayton concedes a free kick for a foul on Nouha Dicko.90:00 +0:36
Centre by Ross McCormack, save made by Matthew Gilks.89:43 Substitution
Substitution Robert Harris replaces Thomas Ince.89:06
Inswinging corner taken from the right by-line by Thomas Ince.88:53
The ball is delivered by Thomas Ince, clearance by Leigh Bromby.88:26
Unfair challenge on Martinez Angel by Mikael Forssell results in a free kick. Direct free kick taken by Alex Baptiste.87:36
Robert Snodgrass sends in a cross.85:07
Neal Eardley restarts play with the free kick.85:07 Dismissal
Dismissal Darren O'Dea receives a red card for second bookable offence.84:49
Free kick awarded for a foul by Darren O'Dea on Nouha Dicko.83:49 Substitution
Substitution Mikael Forssell is brought on as a substitute for Danny Webber.83:34
The ball is crossed by Robert Snodgrass, Danny Webber has a headed effort from close range and clears the crossbar.82:26
Thomas Ince challenges Ross McCormack unfairly and gives away a free kick. Andy Lonergan takes the free kick.80:05
Danny Webber is ruled offside. Matthew Gilks restarts play with the free kick.
Assist by Nouha Dicko.78:47 Goal scored
Goal! - Martinez Angel - Blackpool 1 - 0 Leeds Goal scored by Martinez Angel from deep inside the penalty box to the top left corner of the goal. Blackpool 1-0 Leeds.78:45
A cross is delivered by Nouha Dicko,78:21
The ball is swung over by Thomas Ince, clearance by Darren O'Dea.78:06
Inswinging corner taken from the left by-line by Matt Phillips.77:53
Nouha Dicko takes a shot. Save made by Andy Lonergan.76:56
Free kick awarded for a foul by Ian Evatt on Luciano Becchio. Free kick taken by Robert Snodgrass.75:15
Nouha Dicko is ruled offside. Free kick taken by Andy Lonergan.71:50
Free kick taken by Andy Lonergan.71:50 Substitution
Substitution Gary Taylor-Fletcher goes off and Ludovic Sylvestre comes on.71:50
Paul Robinson fouled by Thomas Ince, the ref awards a free kick.71:20
The official flags Luciano Becchio offside. Matthew Gilks takes the indirect free kick.70:05
Paul Robinson restarts play with the free kick.70:05 Substitution
Substitution Nouha Dicko on for Lomana Tresor LuaLua.70:05
Foul by Gary Taylor-Fletcher on Adam Clayton, free kick awarded.68:21
Adam Clayton produces a cross, Luciano Becchio has a header from close in and clears the crossbar.67:57
Outswinging corner taken left-footed by Robert Snodgrass, Alex Baptiste makes a clearance.67:34
Corner taken by Robert Snodgrass from the left by-line. The ball is crossed by Adam Clayton, Gary Taylor-Fletcher makes a clearance.67:19
Adam Clayton takes a shot. Blocked by Alex Baptiste.67:06
Outswinging corner taken from the left by-line by Robert Snodgrass.66:23
Strike on goal comes in from Ross McCormack from the free kick, save made by Matthew Gilks.66:23 Booking
Booking Barry Ferguson receives a yellow card.66:03
Barry Ferguson gives away a free kick for an unfair challenge on Robert Snodgrass.64:37
Martinez Angel challenges Ross McCormack unfairly and gives away a free kick. Ross McCormack crosses the ball in from the free kick, Alex Baptiste makes a clearance.64:15
The ball is delivered by Stephen Crainey, save made by Andy Lonergan.62:09
Luciano Becchio challenges Thomas Ince unfairly and gives away a free kick. Direct free kick taken by Matthew Gilks.60:58
The ball is delivered by Lomana Tresor LuaLua.60:35
Inswinging corner taken from the right by-line by Thomas Ince, clearance made by Luciano Becchio.60:21
Lomana Tresor LuaLua takes a shot. Andy Lonergan makes a save.54:51
Neal Eardley produces a cross, save by Andy Lonergan.54:38
Free kick awarded for an unfair challenge on Barry Ferguson by Adam Clayton. Barry Ferguson restarts play with the free kick.53:48
A cross is delivered by Robert Snodgrass, Ian Evatt manages to make a clearance. Centre by Paul Robinson, Alex Baptiste manages to make a clearance.51:07 Substitution
Substitution Luciano Becchio comes on in place of Billy Paynter.50:22
Barry Ferguson fouled by Billy Paynter, the ref awards a free kick. Stephen Crainey restarts play with the free kick.47:23
Thomas Ince fouled by Paul Robinson, the ref awards a free kick. Matthew Gilks restarts play with the free kick.46:21
Free kick awarded for a foul by Adam Clayton on Lomana Tresor LuaLua. Direct free kick taken by Matthew Gilks.46:06
Ross McCormack takes a shot. Blocked by Ian Evatt.45:01
The match restarts for the second half.45:00 +1:35 Half time
Half Time It is the end of the first-half.45:00 +0:53
Corner taken by Ross McCormack played to the near post.45:00 +0:42
Danny Webber takes a shot. Save by Matthew Gilks.45:00 +0:17
Corner taken left-footed by Thomas Ince, Billy Paynter manages to make a clearance.44:23
Direct effort from the free kick comes in from Lomana Tresor LuaLua, save by Andy Lonergan.44:23 Booking
Booking Darren O'Dea is shown a yellow card.43:43
Unfair challenge on Gary Taylor-Fletcher by Darren O'Dea results in a free kick.42:48
Shot from just outside the box by Ross McCormack misses to the right of the goal.41:01
The ball is delivered by Lomana Tresor LuaLua, Matt Phillips has a header from inside the six-yard box and clears the crossbar.40:26
Short corner taken by Thomas Ince from the right by-line, Martinez Angel takes a shot. Leigh Bromby makes a clearance.39:46
Free kick awarded for an unfair challenge on Matt Phillips by Tom Lees. Free kick crossed by Stephen Crainey, Billy Paynter makes a clearance.39:23
Tom Lees sends in a cross, Ian Evatt manages to make a clearance.38:37
The official flags Billy Paynter offside. Direct free kick taken by Alex Baptiste.35:59
Centre by Ross McCormack, Ian Evatt manages to make a clearance.34:41
Barry Ferguson concedes a free kick for a foul on Billy Paynter. Free kick taken by Darren O'Dea.32:52
Danny Pugh concedes a free kick for a foul on Barry Ferguson. Free kick taken by Alex Baptiste.32:39
Free kick awarded for an unfair challenge on Ian Evatt by Billy Paynter. Stephen Crainey takes the free kick.32:05
Lomana Tresor LuaLua produces a cross, save by Andy Lonergan.30:44
Thomas Ince challenges Danny Pugh unfairly and gives away a free kick. Andy Lonergan takes the direct free kick.29:51
Thomas Ince takes a inswinging corner from the right by-line played to the near post, clearance made by Leigh Bromby.29:43
The ball is sent over by Matt Phillips, blocked by Paul Robinson.29:30
Thomas Ince takes a shot. Save made by Andy Lonergan.27:13
Thomas Ince challenges Paul Robinson unfairly and gives away a free kick. Andy Lonergan takes the free kick.26:59
Thomas Ince takes a shot. Blocked by Darren O'Dea.26:23
Thomas Ince takes a inswinging corner from the right by-line to the near post.24:15
Foul by Billy Paynter on Stephen Crainey, free kick awarded. Direct free kick taken by Ian Evatt.23:30
The referee blows for offside against Robert Snodgrass. Matthew Gilks restarts play with the free kick.23:10
Robert Snodgrass crosses the ball, clearance made by Martinez Angel.22:15
Corner taken left-footed by Robert Snodgrass from the right by-line to the near post, Stephen Crainey manages to make a clearance.21:08
Centre by Adam Clayton, clearance made by Neal Eardley. Ross McCormack takes a inswinging corner from the left by-line played to the near post.19:39
Matt Phillips takes a inswinging corner from the left by-line played to the near post.19:33
The ball is swung over by Lomana Tresor LuaLua, Darren O'Dea manages to make a clearance.19:05
Inswinging corner taken by Matt Phillips, clearance made by Billy Paynter.15:45
Lomana Tresor LuaLua is penalised for handball and concedes a free kick. Tom Lees takes the direct free kick.14:58
Foul by Billy Paynter on Ian Evatt, free kick awarded. Matthew Gilks restarts play with the free kick.14:29
Lomana Tresor LuaLua concedes a free kick for a foul on Robert Snodgrass. Robert Snodgrass restarts play with the free kick.13:41
The official flags Thomas Ince offside. Andy Lonergan takes the free kick.13:35
Neal Eardley sends in a cross.12:12
Effort on goal by Thomas Ince from just inside the penalty area goes over the target.11:58
A cross is delivered by Robert Snodgrass, Matthew Gilks makes a save.11:23
Free kick awarded for an unfair challenge on Adam Clayton by Martinez Angel. Tom Lees restarts play with the free kick.10:45
Matt Phillips has an effort at goal from deep inside the area missing to the left of the goal.9:31
Shot from just outside the box by Lomana Tresor LuaLua goes over the target.9:26
The ball is crossed by Matt Phillips.7:33
Paul Robinson produces a cross, Darren O'Dea has a header from close in and clears the crossbar.7:00
Robert Snodgrass takes a outswinging corner to the near post.6:05
The ball is swung over by Robert Snodgrass, Matthew Gilks makes a save.4:49
Neal Eardley sends in a cross, Tom Lees makes a clearance.3:51
Inswinging corner taken left-footed by Thomas Ince from the right by-line, clearance made by Darren O'Dea.2:39
Effort on goal by Adam Clayton from just outside the penalty area goes harmlessly over the target.1:23
The referee blows for offside against Ross McCormack. Free kick taken by Matthew Gilks.0:42
The ball is crossed by Neal Eardley.0:00
The match gets underway.
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