PABLO HERNANDEZ settled a bruising Yorkshire derby clash with a dramatic late winner, following a howler by Blades keeper Dean Henderson.
Spanish midfielder Hernandez claimed his seventh goal of the season to win it for Leeds after Henderson's blunder eight minutes from time.
Reuters0 Hernandez claimed his seventh goal of the season
Henderson mishit an intended clearance straight to the feet of Leeds wide-man Jack Clarke, who then teed-up Hernandez for the chance to slot into an empty net.
The Blades have been cutting opponents to shreds in their Bramall Lane fortress, and they went into this showdown unbeaten in eight games on home turf.
It didn't take them long to put the frighteners on their White Rose rivals.
Inside the opening 10 minutes Chris Basham saw a looping header from John Fleck's corner cleared off the line by Ezgjan Alioski, and then David McGoldrick had a blistering drive from range brilliantly saved by keeper Bailey Peacock-Farrell.
Reuters0 Henderson attempted to clear the ball but a weak pass sent it to Clarke
Reuters0 Henderson desperately tries to get down to the ball which he gave away, but Clarke sent it to Hernandez who was ready and waiting to fire the ball in
The visitors suffered a numbing blow on 21 minutes when skipper Liam Cooper was force to hobble out of the action with what appeared to be a knee problem.
He was replaced in centre-defence by Finnish under-21 international Aapo Halme, who quickly came close to giving his side the lead with a low 12-yard drive which was magnificently kept out by Henderson.
Blades boss Chris Wilder had predicted a lively encounter, and it certainly lived up to his pre-match billing with flowing football and crunching tackles on show in equal measures.
Wilder's side had conjured up the better chances in a pulsating opening 45 minutes, with the best of the lot falling to skipper Billy Sharp a minute before the break.
Reuters0 Leeds celebrated their goal at Bramall Lane
Reuters0 Dean Henderson's howler allowed Leeds to take the lead
McGoldrick whipped over a cross which unhinged the Leeds back line and found Sharp at the far post.
But the former Elland Road striker somehow contrived to hoist his header over the bar from four yards out.
Clarke came on as a second-half sub for the out-of-sorts Alioski, and the promising young winger almost broke the deadlock on 55 minutes with a fierce low 20-yard drive which was well held on the line by Henderson.
Henderson, on loan from Manchester United, distinguished himself again five minutes later with another superb stop to deny the visitors eight-goal top scorer Kemar Roofe.
Not the be outdone, Peacock-Farrell produced an equally smart save with his outstretched right foot to keep out McGoldrick's 63rd minute drive.
Then came Henderson's clanger to send the points up the M1 to Leeds.