A superb strike from Harry Forrester helped Brentford claim victory and move to within a point of Sheffield United.
Clayton Donaldson put the home side ahead from close range in the third minute, before Forrester drilled in a terrific effort to double the lead.
Home keeper Simon Moore pulled off a number of fine saves after the break, while Marcello Trotta had an effort ruled out for offside for the Bees.
The Blades slip to fourth in the table, while Brentford move up to fifth.
VIEW FROM THE DRESSING ROOM
Brentford boss Uwe Rosler told BBC London 94.9:
"Today we played the best team in the league.
"The way we played in the first half was unbelievable but we got a little bit tired in the second half.
"The average age of our team today was twenty two and a half.
"I have so much respect for my players and what they showed this week and today."
Sheffield United boss Danny Wilson talking to BBC Radio Sheffield :
"If you look at the opportunities we had today we could have won two or three games.
"We conceded a poor goal but we started the game off well.
"The second goal was good from their point of view. We had a lot of chances but we didn't take them.
"You can't have that many chances in the game and at least not have a couple of goals on the score sheet."
Live Text Commentary
Full Time The referee blows his whistle to end the game.90:00 +4:44
Matthew Hill is ruled offside. Simon Moore takes the free kick.90:00 +0:42
Darryl Westlake gives away a free kick for an unfair challenge on Clayton Donaldson. Indirect free kick taken by Jake Bidwell.90:00 +0:15 Booking
Booking The referee shows Sam Saunders a yellow card.88:18 Booking
Booking Kevin McDonald is shown a yellow card.88:05 Booking
Booking Neill Collins is shown a yellow card.86:10
Corner from the right by-line taken by Nick Blackman, Shaun Miller takes a shot. Blocked by Clayton Donaldson. Corner taken left-footed by Nick Blackman, clearance by Adam Forshaw. Kevin McDonald takes a shot.85:46
Matthew Hill takes a shot. Tony Craig gets a block in.85:22
Nick Blackman takes the outswinging corner, Jake Bidwell manages to make a clearance.82:34
Free kick taken by Sam Saunders.82:34 Booking
Booking Harry Maguire is given a yellow card.81:54
Free kick awarded for an unfair challenge on Clayton Donaldson by Harry Maguire.80:29 Substitution
Substitution Lee Hodson joins the action as a substitute, replacing Marcello Trotta.79:13
Harlee Dean takes a shot. Save made by George Long. The assistant referee signals for offside against Sam Saunders. George Long takes the free kick.77:34
Unfair challenge on Ryan Flynn by Clayton Donaldson results in a free kick. Matthew Hill takes the free kick.76:14
Clayton Donaldson is flagged offside by the assistant referee. Indirect free kick taken by George Long.74:46
Paul Hayes takes a shot. Save by George Long.73:27
Unfair challenge on Marcello Trotta by Michael Doyle results in a free kick. Free kick taken by Sam Saunders.71:22
Nick Blackman has an effort at goal from outside the penalty box missing to the wide left of the goal.70:19
Nick Blackman takes the outswinging corner, Harry Maguire takes a shot. Simon Moore makes a save.
Free kick awarded for a foul by Shaleum Logan on Ryan Flynn. Ryan Flynn takes the free kick.69:17
Unfair challenge on Darryl Westlake by Sam Saunders results in a free kick. Harry Maguire takes the free kick.65:50
Ryan Flynn takes the direct free kick.65:50 Substitution
Substitution (Brentford) makes a substitution, with Paul Hayes coming on for Rob Kiernan.65:50
Free kick awarded for an unfair challenge on Nick Blackman by Adam Forshaw.64:39 Substitution
Substitution Richard Cresswell replaces Chris Porter.63:30
Free kick taken by Ryan Flynn.63:30 Booking
Booking The referee shows Shaleum Logan a yellow card for unsporting behaviour.63:20
Shaleum Logan challenges Ryan Flynn unfairly and gives away a free kick.60:01
Simon Moore takes the indirect free kick.60:01 Substitution
Substitution Darryl Westlake is brought on as a substitute for Tony McMahon.60:01
Nick Blackman takes a shot. Save by Simon Moore. Clayton Donaldson fouled by Shaun Miller, the ref awards a free kick.59:32
Ryan Flynn fouled by Adam Forshaw, the ref awards a free kick. Matthew Hill takes the free kick.58:35 Substitution
Substitution Sam Saunders on for Harry Forrester.58:35
Chris Porter has an effort at goal from deep inside the area missing to the right of the target.57:15
Jake Bidwell challenges Nick Blackman unfairly and gives away a free kick. Kevin McDonald takes the direct free kick.56:33
Nick Blackman takes a shot. Harlee Dean gets a block in.54:00
Marcello Trotta takes a shot. George Long makes a save. The referee blows for offside. George Long restarts play with the free kick.52:33
Clayton Donaldson challenges Matthew Hill unfairly and gives away a free kick. Matthew Hill takes the indirect free kick.51:25
Shaun Miller takes a shot. Save made by Simon Moore. Ryan Flynn decides to take a short corner.49:10
Shot from just outside the box by Harry Maguire misses to the right of the goal.45:01
The referee blows his whistle to start the second half.45:00 +0:31 Half time
Half Time The match has reached half-time.44:18
Shaun Miller is penalised for handball and concedes a free kick. Indirect free kick taken by Simon Moore.43:28
Michael Doyle fouled by Adam Forshaw, the ref awards a free kick. Free kick taken by George Long.42:25
The offside flag is raised against Marcello Trotta. Indirect free kick taken by Michael Doyle.41:35
Clayton Donaldson challenges Matthew Hill unfairly and gives away a free kick. Indirect free kick taken by Matthew Hill.39:36
Free kick awarded for an unfair challenge on Shaun Miller by Tony Craig. Tony McMahon restarts play with the free kick.34:45
Kevin McDonald fouled by Toumani Diagouraga, the ref awards a free kick. Indirect free kick taken by Tony McMahon, Header from close range by Neill Collins misses to the right of the goal.33:42
Shaleum Logan fouled by Michael Doyle, the ref awards a free kick. Harlee Dean restarts play with the free kick.33:00
Shot from long range by Adam Forshaw goes wide of the left-hand post.31:39
Handball by Shaun Miller. Free kick taken by Simon Moore.30:30
Corner taken by Harry Forrester, Neill Collins makes a clearance.28:43
The assist for the goal came from Tony Craig.28:43 Goal scored
Goal! - Harry Forrester - Brentford 2 - 0 Sheff Utd A goal is scored by Harry Forrester from outside the penalty area to the bottom left corner of the goal. Brentford 2-0 Sheff Utd.27:04
Chris Porter concedes a free kick for a foul on Tony Craig. Simon Moore takes the indirect free kick.24:36
Foul by Tony McMahon on Harry Forrester, free kick awarded. Adam Forshaw takes the free kick. Adam Forshaw has an effort at goal from outside the penalty box which goes wide right of the target.21:59
Marcello Trotta takes a shot. Blocked by Neill Collins.19:23
Harry Forrester takes a shot. Save by George Long. Outswinging corner taken by Harry Forrester from the right by-line, Close range header by Clayton Donaldson misses to the right of the target.17:52
Foul by Shaleum Logan on Ryan Flynn, free kick awarded. Tony McMahon takes the free kick. Chris Porter takes a shot. Save made by Simon Moore.15:02
Foul by Matthew Hill on Clayton Donaldson, free kick awarded. Harry Forrester takes the free kick.13:45
Corner taken by Nick Blackman from the left by-line. The offside flag is raised against Chris Porter. Indirect free kick taken by Simon Moore.11:05
Nick Blackman takes the outswinging corner, clearance made by Harlee Dean.10:30
Jake Bidwell challenges Chris Porter unfairly and gives away a free kick. Tony McMahon takes the indirect free kick.8:36
Shaun Miller takes a shot. Save made by Simon Moore. Nick Blackman takes the outswinging corner, Harry Forrester makes a clearance.7:49
Michael Doyle gives away a free kick for an unfair challenge on Adam Forshaw. Harlee Dean restarts play with the free kick.6:34
Unfair challenge on Harry Forrester by Tony McMahon results in a free kick. Harry Forrester takes the free kick.5:15
Foul by Tony McMahon on Marcello Trotta, free kick awarded. Free kick taken by Simon Moore.2:54
Toumani Diagouraga provided the assist for the goal.2:54 Goal scored
Goal! - Clayton Donaldson - Brentford 1 - 0 Sheff Utd Clayton Donaldson scores a goal from close in to the bottom right corner of the goal. Brentford 1-0 Sheff Utd.0:00
The match has kicked off.
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