United's unbeaten run in the Premier League was extended to six games, following a fascinating six-goal encounter at Bramall Lane in front of the Sky Sports cameras.
The Blades looked set to claim all three points against Manchester United, before a devastating spell of three-goals in seven minutes put the visitors in front, only for substitute Oli McBurnie to rescue a deserved draw for United at the death.
For the clash against the Red Devils, boss Wilder made two enforced changes, with Moore and Jagielka replacing the ineligible Henderson and injured Egan.
After a quiet opening ten minutes, the Blades had two chances within a matter of seconds. Firstly, De Gea saved from Lundstram's left-footed volley from Norwood's centre, before the Spanish stopper produced an even better save to deny McGoldrick with a header from point-blank range from Stevens inch perfect cross from the left.
It was becoming a feisty affair, with tackles flying in from all angles, with Jones and Norwood competing for a loose ball, before Lundstram was harshly adjudged to have committed a foul. But the sound level inside S2 literally hit the roof in the 19th minute as the Blades deservedly went in front. Mousset chased hard and forced Jones into a mistake, De Gea was equal to Lundstram's initial effort, saving with his legs, but was powerless to deny FLECK on the rebound.
On 29 minutes, Moore was called into action for the first time, saving comfortably from Martial. But it was the home side, continuing to force the issue and after a prolonged spell of position, Fred was forced to concede a corner to prevent Baldock's low cross picking out a runner.
The visitors looked a threat on the break, with O'Connell twice called into action to halt the danger, firstly at the expense of a corner, before acrobatically clearing to stop the ball reaching the onrushing Fred and that was the last action of note in the first-half.
The opening action of the second period saw Rashford fashion an opportunity out of nothing, but his shot sailed harmlessly into the Kop. At the other end, Lundstram freed Baldock down the right and Williams was carded by referee Marriner following a reckless lunge that gave the Blades a free kick in a promising position, but unfortunately it came to nothing and Lundstram was then booked for halting a potential counter attack.
United took a firmer grip of the game in the 52nd minute and it was that man MOUSSET who delightfully slotted an effort past De Gea from outside the area, having been freed by a clever ball by Fleck, as the Blades won the ball high and broke quickly. In response, the visitors enjoyed a prolonged spell which ended with Maguire firing just wide, when trying to pick out the run of Martial.
Wan-Bissaka saw yellow for a mistimed challenge on McGoldrick, before Moore showed assured handling to collect a dangerous low cross from James, the United stopper then got his angles inch perfect as he let Rashford's shot go wide of his near post. Mousset pulled up when chasing down Lindelof and was subsequently replaced by McBurnie.
With 18 minutes, the visitors gave themselves hope as James got the better of Stevens and despite clearing the initial cross, the ball fell kindly for WILLIAMS who fired home a right-footed half-volley that gave Moore no chance and five minutes later they restored parity, as GREENWOOD applied the finishing touch from the middle of the six-yard from Rashford's centre.
The visitors had clearly been buoyed by the two quick goals and lightening quick pace helped them take an undeserved lead. James combined with Martial down the left and his cut back found RASHFORD who calmly side-footed into an empty net with Moore already committed.
Sharp and Robinson were introduced as the Blades looked to mount a comeback and as four minutes of added time were signalled, MCBURNIE volleyed home the equaliser from Robinson's chip across the box, despite a very, very anxious wait while VAR checked a possible handball and to the delight of the majority inside the Lane, that was the final action of a thrilling contest.
Blades: Moore, Baldock, Stevens, Fleck, O'Connell, Basham (Robinson 83), Lundstram, Jagielka, Norwood, McGoldrick (Sharp 78), Mousset (McBurnie 68).
Subs: L. Freeman, Verrips, Osborn, Bešić.
Man Utd: De Gea, Jones (Lingard 45), Maguire, Lindelof, Wan-Bissaka, Andreas (Greenwood 73), Fred, Williams, James, Martial (Tuanzebe 85), Rashford.
Subs: Grant, Young, Garner, Mata.
As it happened...
Baldock raiding down the right as the Blades start well, he heads to the by-line before crossing but the ball rebounds back off the wing back for a goal kick.
First corner of the game won by the Blades but Norwood sails it too deep and out of play.
Great combination of challenges from Baldock and Basham stop a promising break by Rashford. 0-0.
Double-save from De Gea.
Firstly, Norwood chips the ball to Lundstram who volleys first time and De Gea saves low to his right.
The follow up cross then finds McGoldrick whose header is saved from eight yards out.
Some tough challenges going in from Jones and Norwood.
Lundstram then commits a foul, but the volume has certainly gone up!
Mousset attempts to sprint into the area. Challenging with Phil Jones, the Man Utd defender goes down when Mousset felt he was fouled, and the free-kick goes to the visitors. 0-0.
Blades take the lead when Mousset out-muscles Jones, he squares it for Lundtram who shoots. De Gea saves and then the rebound is bundled in by Fleck. 1-0.
Fleck free-kick whistles into the area, takes a nick off a Man Utd defender and goes just wide.
The visitors defend the resulting corner. 1-0.
Surging run forward from McGoldrick. He gets to the edge of the area and shoots, but straight at De Gea. 1-0.
Simon Moore makes his first save. Anthony Martial with the strike and Moore makes a comfortable hold diving to his left. 1-0.
Brilliant build-up play by the Blades with Lundstram at the heart of it, a dangerous low cross then by Baldock is turned behind for a corner. 1-0
Blades take the corner short, and Baldock wins another on the near side.
Corner goes deep this time and Maguire heads clear. 1-0.
O'Connell puts a low cross behind for a corner.
The visitors take it short, but when the cross comes in it sails away for a throw. 1-0.
One added minute
Blades 1 - 0 Man Utd
John Fleck's goal gives the Blades the half-time advantage.
Second half underway...
Half-time change for Man Utd. Phil Jones replaced by Jesse Lingard
Man Utd hit the Blades on the counter attack, but Rashford's run is halted by Jagielka who clears. 1-0.
Rashford takes aim from 25 yards but sails his effort over the bar. Brighter though from the visitors. 1-0.
Brandon Williams into the book for a late challenge on Baldock.
Lundstram quickly joins him in the book for taking down Lingard as the visitors countered from a poor Blades free-kick. 1-0.
2-0 Blades and it is Lys Mousset who scores. The visitors lose the ball on half-way. Mousset plays it short to Fleck who returns it, and the Frenchman finds the bottom corner with a low shot from 20 yards. 2-0.
Prolonged spell of possession for Man Utd ends with a low cross from Maguire which Moore watches past the post for a goal kick. 2-0.
Yellow for Wan-Bissaka for a lunge on McGoldrick. 2-0.
Teasing low cross from Dan James which is well held by Moore. 2-0.
Shot from distance by Martial is just wide with Moore diving to his right. 2-0.
Mousset pulls up chasing a long ball. He has to be replaced, so on comes Oli McBurnie.
O'Connell finds McGoldrick who cuts in from the left wing, drops his shoulder and shoots, but he doesn't get hold of it and De Gea makes a comfortable save.
Goal for Man Utd.
James takes on Stevens and crosses into the area. It is headed clear only as far as Williams who drills a low shot into the bottom corner. 2-1.
Change for Man Utd as Mason Greenwood replaces Andreas Pereira.
Goal for Man Utd.
Rashford with a brilliant low cross and Greenwood stabs in for 2-2.
Change for the Blades.
Billy Sharp replaces McGoldrick.
Goal for Man Utd.
Great work down the left as James cuts the ball back for Rashford and the visitors take the lead.
Another swift move by the visitors but this time Lingard lifts it over from just inside the area. 2-3
Callum Robinson replaces Ollie Norwood for the Blades.
Martial is replaced by Tuanzebe.
Corner to the Blades following a Wan-Bissaka challenge,
Cross goes in but it is glanced wide by O'Connell under pressure.
GOAL FOR BLADES.
VAR check though...
Robinson crossed for McBurnie who controls it and sticks it away.
After a check for handball by VAR, the goal is given and it is 3-3.
Four added minutes.
Blades 3 - 3 Man Utd
Incredible game. Blades 2-0 through Fleck and Mousset. The visitors score three in seven minutes to lead. McBurnie earns Blades a point at the death.