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And hopes would have been boosted further for the visitors by the absence from the team sheet of the injured Wayne Rooney, while van Persie was only fit enough for the bench, where he sat alongside former Sunderland loanee Welbeck.
The home team continued to dominate with Ashley Young looking a constant danger on the right flank.
Standing on the right, 15 yards out, was Seb Larsson, completely unmarked, and he drove a low right foot shot across United keeper David de Gea and into the bottom corner Skechers Go Walk Mens
And then Nani fired just over the crossbar from United's next attack before Patrice Evra went closest so far to opening the scoring when he nodded a left wing corner goalwards from six yards out and Mannone held on to the ball on his goal line.
Giggs made five changes to the side which beat Norwich City 4 0 in his first game as interim manager but he retained the same 4 2 3 1 formation, with Hernandez the lone striker.
That series of attacks had Gus Poyet on his feet shouting instructions as Sunderland dropped deeper but they remained disciplined and started to probe.
saw Sunderland's bid narrow from a four horse to a two horse race with Cardiff losing 3 0 to Newcastle United and Fulham 4 1 to Stoke City to confirm their relegation.
Victory Vans Galaxy
United predictably responded and Alonso was booked in the 31st minute for chopping down the troublesome Young.
Although Sunderland had not won at Manchester United in the league since 1968, their last visit to Old Trafford had ended in penalty shoot out triumph in the Capital One Cup semi final in January.
With quarter of an hour gone, Sunderland were in danger of looking comfortable but at that point nerves were set jangling when John O'Shea almost clipped Michael Carrick's low cross from the right into his own goal.
But it was still completely against the run of play when Sunderland took the lead on the half hour.
Poyet and his players had gone into the game with confidence rightly high after notching back to back league victories and unsurprisingly the head coach named an unchanged side, with Santiago Vergini once again keeping Phil Bardsley out of the starting line up.
It was his first league goal of the season and only his second of the campaign, having scored against Southampton in the Capital One Cup in November.
Then a delightful glanced ball forward by Juan Mata in the 14th minute played in Nani down the left but his run was ended by a well timed tackle from Lee Cattermole who set up a Sunderland counter Johnson driving his side's first shot of the game across the target from the right.
The home side had much of the ball, and much of it around the Sunderland area in the minutes that followed.
But the Black Cats could have won by more both Fabio Borini and Emanuele Giaccherini hit the woodwork in the second half.
But Vito Mannone's goal was not troubled further as Juan Mata thrashed wide and the Black Cats successfully negotiated the opening 10 minutes.
After their first bit of real pressure of the game, the Black Cats kept hold of the ball on the right before Connor Wickham pulled a low ball back across the box.
With results going their way it meant that when the half time whistle went, Sunderland were all but safe with Fulham and Cardiff losing their games staring relegation in the face.
But Hernandez was particularly profligate in front of goal and substitutes Robin van Persie and Danny Welbeck were unable to make anything of the scraps they fed on.
But they produced little of note until a long range grass cutter from Darren Fletcher in the 43rd minute which Mannone saw coming from a long way out.
Man United kicked off under blazing sunshine in front of a typically massive crowd and kept possession before earning a third minute corner which April Player of the Month Connor Wickham headed clear.
It means only Norwich City who are three points behind Sunderland with two games remaining but a far inferior goal difference and Chelsea at Stamford Bridge still to play can get above the Black Cats.
Sunderland got a glimmer of a chance in the 11th minute when Adam Johnson nodded on Santiago Vergini's long ball but couldn't direct it to the lurking Wickham.
United captain Nemanja Vidic was lucky to escape a booking when he shoved Fabio Borini in the back as Sunderland countered in the 24th minute. But Carrick was not so lucky a couple of minutes later when he clattered through the back of the Italian and received a yellow.
Sunderland were gradually prospering a little more going forward and Marcos Alonso drove wide following a set piece in the 27th minute.
Super Seb takes Cats to brink of safety
Victory was achieved through Seb Larsson's first league goal of the season and some tremendously well disciplined and dogged defending from Gus Poyet's men.
It is an amazing turnaround but it was one Vans Gray Black
Sunderland fully deserved on the back of Herculean efforts at Old Trafford where they stuck to their task to produce an amazing result.
Not that United were Mbt Shoes Canada in any way pushovers under interim manager Ryan Giggs with the home side dominating the possession stats and they could easily have won the game had they made the most of their chances.
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