Emil Riis scored his 13th goal of the season - and his first since 23 November - to secure a point for Preston
Emil Riis' 89th-minute goal saw Preston North End come from 2-0 down with 10 men to draw with Sheffield United.
Jayden Bogle gave the Blades an early lead with a low shot through a crowded penalty area after John Egan's header from a corner had been beaten away by Daniel Iversen.
The Blades doubled the lead through a Billy Sharp penalty after Andrew Hughes was controversially sent off for a foul on Rhian Brewster.
Alan Browne pulled a goal back from close range before Riis popped up at the far post to slot in Ched Evans' cross.
Despite dropping two points, Sheffield United move up to 11th and into the top half of the table on 33 points, ahead of 13th-placed Preston on goal difference.
- Relive Tuesday's EFL action as it happened
Preston should have gone ahead after 12 minutes when Riis broke through and fed the recalled Scott Sinclair, but the winger blasted against the legs of Wes Foderingham.
The Blades broke immediately from Foderingham's save as Iliman Ndiaye forced Iversen to push his low shot past the far post, and it was not long before Bogle put the visitors ahead with an effort that beat the unsighted Preston keeper.
Billy Sharp scored his 121st Championship goal to equal the record since the second tier was rebranded in 2004 - his first came for Sheffield United 5,061 days ago
The visitors began to up the pressure, but Preston coped well until conceding what appeared to be a soft penalty.
Bogle's pass was flicked to Brewster by Sharp and the former Liverpool forward broke through before going down under a tangle of legs with Hughes. Referee David Webb pointed to the spot and sent the defender off for denying a goal scoring opportunity.
Sharp's penalty saw the 35-year-old equal former Preston forward David Nugent's record of 121 goals in the Championship since the second tier was renamed in 2004. The striker got his first at this level in March 2008 in a 2-1 win over Coventry City.
Iversen made a good save from Ndiaye soon after the restart before Foderingham made an even better one two minutes later when he tipped over Browne's header.
Brewster should have had the game out of sight after missing three good chances in the opening 20 minutes of the second half - his third saw the club's record signing drag a shot inches wide of the far post from six yards out.
Daniel Johnson and Riis had chances in quick succession before Browne's powerful side-footed finish got Preston back into it after Johnson had cut the ball back.
And those earlier misses came back to haunt Paul Heckingbottom's side as Riis sealed the win before Sepp van den Berg did well to block a stoppage-time effort from United's Conor Hourihane.
- Line-upsMatch StatsLive Text
Line-upsPreston
Formation 3-4-1-2
12Iversen2van den Berg5Bauer16Hughes44Potts4Whiteman8Browne29Barkhuizen11Johnson19Riis Jakobsen31Sinclair
- 12Iversen2van den Berg5Bauer16HughesBooked at 38mins44PottsSubstituted forRaffertyat 45'minutes4Whiteman8Browne29BarkhuizenSubstituted forEvansat 65'minutes11Johnson19Riis Jakobsen31SinclairSubstituted forCunninghamat 40'minutesBooked at 82mins
Substitutes
- 3Cunningham6Lindsay9Evans13McCann15Rafferty24Maguire25Ripley
Sheff Utd
Formation 3-4-1-2
18Foderingham6Basham12Egan19Robinson20Bogle16Norwood24Hourihane3Stevens29Ndiaye7Brewster10Sharp
- 18Foderingham6Basham12Egan19Robinson20BogleBooked at 80mins16Norwood24HourihaneBooked at 60mins3StevensSubstituted forNorrington-Daviesat 84'minutes29NdiayeSubstituted forBergeat 84'minutes7BrewsterSubstituted forMcGoldrickat 70'minutes10Sharp
Substitutes
- 8Berge14Burke17McGoldrick28Slater31Eastwood33Norrington-Davies34Gordon
Referee:David WebbAttendance:12,954Match StatsHome TeamPrestonAway TeamSheff UtdPossessionHome38%Away62%ShotsHome12Away18Shots on TargetHome8Away7CornersHome4Away11FoulsHome6Away8Live TextPost update
Match ends, Preston North End 2, Sheffield United 2.
90'+6'Full Time
Second Half ends, Preston North End 2, Sheffield United 2.
90'+5'Post update
Corner, Sheffield United. Conceded by Patrick Bauer.
90'+4'Post update
Corner, Preston North End. Conceded by John Egan.
90'+1'Post update
Attempt blocked. Conor Hourihane (Sheffield United) left footed shot from the centre of the box is blocked.
89'goalGoal!
Goal! Preston North End 2, Sheffield United 2. Emil Riis Jakobsen (Preston North End) left footed shot from very close range to the bottom left corner. Assisted by Ched Evans with a cross.
87'Post update
Offside, Sheffield United. David McGoldrick tries a through ball, but Billy Sharp is caught offside.
87'Post update
Offside, Preston North End. Benjamin Whiteman tries a through ball, but Ched Evans is caught offside.
86'Post update
Offside, Preston North End. Joseph Rafferty tries a through ball, but Emil Riis Jakobsen is caught offside.
84'Substitution
Substitution, Sheffield United. Rhys Norrington-Davies replaces Enda Stevens because of an injury.
84'Substitution
Substitution, Sheffield United. Sander Berge replaces Iliman Ndiaye.
82'Booking
Greg Cunningham (Preston North End) is shown the yellow card for a bad foul.
82'Post update
David McGoldrick (Sheffield United) wins a free kick on the right wing.
82'Post update
Foul by Greg Cunningham (Preston North End).
80'Booking
Jayden Bogle (Sheffield United) is shown the yellow card.
76'Post update
Foul by Iliman Ndiaye (Sheffield United).
76'Post update
Alan Browne (Preston North End) wins a free kick in the defensive half.
76'Post update
Attempt blocked. Conor Hourihane (Sheffield United) left footed shot from a difficult angle and long range on the right is blocked.
75'Post update
Jayden Bogle (Sheffield United) wins a free kick on the right wing.
75'Post update
Foul by Greg Cunningham (Preston North End).
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Source: bbc.com