Leeds earned a place in the Capital One Cup quarter-finals as they beat a disappointing Southampton side.
A second-string Saints hardly mustered a chance and should have been behind when Luke Varney missed an open goal.
But after he hit the bar, his run and cross helped set up Michael Tonge, who fired in from the edge of the area.
El-Hadji Diouf tucked in two minutes from the end after Rodolph Austin's shot was saved and Luciano Becchio hit the third via an injury-time penalty.
The victory for the Championship team meant they reached the last eight of the competition for the first time since 1996.
The last time Saints were a Premier League side, during the 2004-05 campaign, they were also knocked out by a Championship side - Watford.
And it puts Leeds boss Neil Warnock on the way to replicating a run to the semi-finals while in charge of Sheffield United 10 years ago.
Southampton manager Nigel Adkins chose a completely changed team following defeat by Tottenham on Sunday, but the decision backfired and his side's poor form continued as they slipped to a third consecutive defeat.
With their next Premier League game not until next Monday, Saints could have fielded some of their best players. Instead, the teamsheet would have been of little comfort to their travelling supporters and they missed a golden opportunity to earn their fourth win of the season.
Despite their lacklustre showing, the fact it was only 1-0 at half-time was down to Leeds' profligacy rather than anything else.
Varney registered a rock-solid nomination for miss of the season when he could not find the target from two yards out following Diouf's cross, with goalkeeper Kelvin Davis nowhere to be seen.
Varney went close soon after and also hit the bar after a Southampton mix-up, but his embarrassment was partially relieved when his run and cross down the right eventually fell for Tonge to score his third goal of the season after 35 minutes.
The visitors lacked cohesion throughout and for large parts of the first half Emmanuel Mayuka was isolated up front on his first start for the club.
Guly Do Prado was pushed up after the break to try and remedy that situation, but Leeds were still the game's aggressors with Varney drawing another stop from Davis.
While there was one goal between the teams the game was still in the balance, but Warnock's side eventually settled their fans' nerves when Diouf tucked in following Davis's stop.
And Becchio's spot-kick after Tonge was brought down led the Leeds fans to taunt Adkins with "you're getting sacked in the morning" at the final whistle.
- 12 Ashdown
- 02 Peltier (Pugh - 90' )
- 04 Lees
- 05 Pearce
- 08 Austin
- 11 Varney (Becchio - 90' )
- 14 White
- 17 Brown
- 18 Tonge
- 25 Byram
- 21 Diouf (Gray - 90' )
- 01 Kenny
- 03 Drury
- 07 Green
- 16 Pugh
- 19 Norris
- 10 Becchio
- 20 Gray
- 01 K Davis
- 05 Hooiveld
- 25 Seaborne Booked
- 29 Reeves Booked
- 32 Butterfield
- 16 Ward-Prowse
- 21 Guly
- 27 Chaplow
- 33 De Ridder (Isgrove - 67' )
- 19 Lee (Shaw - 67' )
- 24 Mayuka
- 12 Gazzaniga
- 23 Shaw
- 26 Stephens
- 28 Chambers
- 39 Isgrove
- 35 Hoskins
- 36 Sinclair
Live Text Commentary
Full Time The referee blows for the end of the match.90:00 +3:16 Substitution
Substitution Andy Gray is brought on as a substitute for El-Hadji Diouf.90:00 +3:10
The assist for the goal came from Michael Tonge.90:00 +2:53 Goal scored
Goal! - Luciano Becchio - Leeds 3 - 0 Southamp'n Luciano Becchio scores a placed penalty. Leeds 3-0 Southampton.90:00 +1:43
Luke Shaw concedes a Penalty for a foul on Michael Tonge.90:00 +1:14
Michael Tonge decides to take the corner short.89:38 Substitution
Substitution Luciano Becchio on for Luke Varney.89:24 Substitution
Substitution Danny Pugh comes on in place of Lee Peltier.88:17
Richard Chaplow takes a shot. Save made by Jamie Ashdown.87:27 Goal scored
Goal! - El-Hadji Diouf - Leeds 2 - 0 Southamp'n Goal scored by El-Hadji Diouf from close range low into the middle of the goal. Leeds 2-0 Southampton.86:43
Rodolph Austin takes a shot. Kelvin Davis makes a save.84:32
Emmanuel Mayuka takes a shot. Blocked by Jason Pearce.83:40
Danny Butterfield delivers the ball, save made by Jamie Ashdown.83:15
Emmanuel Mayuka takes a short corner, Centre by Richard Chaplow, clearance by Tom Lees.83:08
The ball is swung over by Richard Chaplow, clearance by Tom Lees.80:54
El-Hadji Diouf takes a short corner.80:37
Corner taken by Michael Tonge from the left by-line, clearance by Jos Hooiveld.80:26
Centre by Michael Brown, clearance made by Jos Hooiveld.79:38
Danny Butterfield concedes a free kick for a foul on Luke Varney. Michael Tonge takes the direct free kick.77:28
Free kick awarded for a foul by Richard Chaplow on El-Hadji Diouf. Jamie Ashdown takes the direct free kick.
Shot by Guly Do Prado. Blocked by Jason Pearce.75:53
Jamie Ashdown restarts play with the free kick.75:53 Booking
Booking Ben Reeves is booked.75:28
Ben Reeves concedes a free kick for a foul on Samuel Byram.73:34
Guly Do Prado concedes a free kick for a foul on Rodolph Austin. Free kick taken by Jamie Ashdown.71:52
Michael Brown concedes a free kick for a foul on Richard Chaplow. Direct free kick taken by Kelvin Davis.71:14
The referee blows for offside against Luke Varney. Free kick taken by Daniel Seaborne.70:00
Emmanuel Mayuka has an effort at goal from deep inside the area missing to the left of the target.68:46
Corner from left by-line taken by Michael Tonge.68:17
Free kick awarded for a foul by Danny Butterfield on El-Hadji Diouf. Michael Tonge delivers the ball from the free kick right-footed from left by-line, clearance made by Daniel Seaborne.67:10
The assistant referee signals for offside against Emmanuel Mayuka. Indirect free kick taken by Jamie Ashdown.66:00
Jamie Ashdown restarts play with the free kick.66:00 Substitution
Substitution Steve De Ridder leaves the field to be replaced by Lloyd Isgrove.66:00 Substitution
Substitution Luke Shaw joins the action as a substitute, replacing Tadanari Lee.66:00
Free kick awarded for a foul by Tadanari Lee on Aidan White.64:52
Free kick awarded for a foul by El-Hadji Diouf on Richard Chaplow. Daniel Seaborne restarts play with the free kick.64:25
The ball is sent over by Danny Butterfield, Tom Lees makes a clearance.63:34
Rodolph Austin concedes a free kick for a foul on Ben Reeves. Free kick taken by Jos Hooiveld.63:06
Luke Varney takes a shot. Save by Kelvin Davis.60:07
James Ward-Prowse challenges Michael Brown unfairly and gives away a free kick. Jamie Ashdown takes the free kick.59:29
The offside flag is raised against El-Hadji Diouf. Free kick taken by Kelvin Davis.59:07
El-Hadji Diouf crosses the ball.57:07
Michael Tonge produces a shot on goal direct from the free kick, blocked by Daniel Seaborne.57:07 Booking
Booking Daniel Seaborne receives a yellow card.57:00
Free kick awarded for an unfair challenge on Luke Varney by Daniel Seaborne.55:17
The ball is crossed by Danny Butterfield, clearance made by Tom Lees.53:21
Michael Tonge has a shot on goal from outside the area which misses right.52:17
Luke Varney is flagged offside by the assistant referee. Daniel Seaborne restarts play with the free kick.46:43
Jos Hooiveld concedes a free kick for a foul on Luke Varney. El-Hadji Diouf produces a shot on goal direct from the free kick.46:02
Lee Peltier delivers the ball.45:01
The second half kicks off.45:00 +1:07 Half time
Half Time The referee blows for half time.42:41
Daniel Seaborne challenges Luke Varney unfairly and gives away a free kick. Michael Tonge crosses the ball in from the free kick, save by Kelvin Davis.42:18
Luke Varney concedes a free kick for a foul on Ben Reeves. Free kick taken by Jos Hooiveld.39:16
The ball is swung over by Ben Reeves.37:57
The ball is crossed by Emmanuel Mayuka, save by Jamie Ashdown.36:34
Rodolph Austin concedes a free kick for a foul on Guly Do Prado. Ben Reeves takes the direct free kick.34:03 Goal scored
Goal! - Michael Tonge - Leeds 1 - 0 Southamp'n Goal scored by Michael Tonge from the edge of the penalty box to the bottom right corner of the goal. Leeds 1-0 Southampton.32:48
Samuel Byram delivers the ball, Header by Rodolph Austin from deep inside the penalty area misses to the left of the target.32:23
Emmanuel Mayuka gives away a free kick for an unfair challenge on Samuel Byram. Free kick taken by El-Hadji Diouf.30:14
Outswinging corner taken right-footed by Michael Tonge, Headed effort from inside the area by Luke Varney misses to the left of the target.30:01
A cross is delivered by Michael Tonge, clearance by Jos Hooiveld.28:38
Effort from just outside the box by Luke Varney strikes the post.26:20
Luke Varney has an effort at goal from just inside the box that misses to the right of the target.24:35
The ball is sent over by Danny Butterfield.24:15
Foul by Lee Peltier on James Ward-Prowse, free kick awarded. Free kick taken by Jos Hooiveld.23:54
Corner taken right-footed by Michael Tonge from the left by-line, Richard Chaplow manages to make a clearance.23:42
Centre by Michael Tonge, Ben Reeves makes a clearance.22:11
Guly Do Prado gives away a free kick for an unfair challenge on Aidan White. The free kick is swung in right-footed by Michael Tonge.21:54
The ball is crossed by Steve De Ridder, clearance by Jason Pearce.20:31
Outswinging corner taken right-footed by Michael Tonge from the right by-line, Jos Hooiveld makes a clearance.19:51
Outswinging corner taken right-footed by Michael Tonge from the right by-line.19:20
The ball is swung over by Danny Butterfield, clearance by Jason Pearce.17:39
Rodolph Austin concedes a free kick for a foul on Jos Hooiveld. Jos Hooiveld takes the free kick.17:28
Richard Chaplow crosses the ball.16:43
Steve De Ridder fouled by Aidan White, the ref awards a free kick. Ben Reeves takes the direct free kick.15:36
Corner taken left-footed by Richard Chaplow from the right by-line, clearance by Jason Pearce.15:16
Shot from close range by El-Hadji Diouf misses to the right of the goal.14:36
Effort from close range by Luke Varney goes wide left of the target.14:07
The ball is swung over by Aidan White.13:00
Free kick awarded for a foul by Guly Do Prado on Samuel Byram. Free kick crossed right-footed by Michael Tonge, clearance by Ben Reeves.10:54
Tom Lees fouled by Emmanuel Mayuka, the ref awards a free kick. Jamie Ashdown takes the free kick.9:02
Danny Butterfield crosses the ball, clearance by Jason Pearce.8:06
The ball is crossed by Rodolph Austin, Danny Butterfield makes a clearance.7:50
The ball is delivered by Samuel Byram, clearance by Daniel Seaborne.7:19
James Ward-Prowse delivers the ball.6:52
Free kick awarded for a foul by Lee Peltier on Emmanuel Mayuka. Tadanari Lee restarts play with the free kick.5:29
The offside flag is raised against Luke Varney. Free kick taken by Kelvin Davis.3:01
The assistant referee flags for offside against Emmanuel Mayuka. Jamie Ashdown restarts play with the free kick.1:46
Free kick awarded for an unfair challenge on Luke Varney by Daniel Seaborne. The free kick is delivered right-footed by Michael Tonge from left channel, Tom Lees gives away a free kick for an unfair challenge on Kelvin Davis. Kelvin Davis restarts play with the free kick.0:11
Aidan White sends in a cross, clearance made by Jos Hooiveld.0:00
The referee starts the match.
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