Man Utd will play Everton in last four
West Ham have late goal disallowed for offside
West Ham XI: Randolph, Antonio, Tomkins, Ogbonna, Cresswell, Kouyate, Noble, Valencia, Lanzini, Payet, Carroll
Man Utd XI: De Gea, Fosu-Mensah, Smalling, Blind, Rojo, Carrick, Fellaini, Lingard, Herrera, Martial, Rashford
West Ham 0-2 Man Utd
Image source, ReutersMark Noble is a diminutive chap but he produces an impressive display of strength as he picks up Ander Herrera, who was slowly hobbling towards the touchline after injuring his foot, and carries him over.
Time running out for West Ham, Noble knows it.
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Stephen Cummins: This is what happens when we play players in their best positions, brilliant stuff.
Ashic Mahtab: Two goals... One of impossible talent, one off an ugly knee. They all count.
Seth Gogo Egoeh: Wasn't Slaven so confident of West Ham progressing to the semis after the first leg against Man. United? Arrogance and pride!
Danny Mills
Former Man City defender on BBC Radio 5 live
"David Gold said before the tie he would prefer an FA Cup win than fourth place. The occasion has got to West Ham."
West Ham 0-2 Man Utd
Ander Herrera catches Mark Noble with a stray leg and he is booked.
West Ham then make another change as Emmanuel Emenike replaces Manuel Lanzini.
West Ham 0-2 Man Utd
Martin Keown
Former Arsenal defender on BBC One
Image source, Getty Images"These Manchester United players are on the top of their game. This has to be their best performance of the season surely."
West Ham 0-2 Man Utd
Image source, .Plenty of singing in the stands, but it is coming from the away end. Manchester United are striding into the semi-finals here. West Ham look disjointed and unable to get a foot on this game.
Credit where credit is due for Louis van Gaal. Whenever you think he is down and out, he finds a way to respond.
Danny Mills
Former Man City defender on BBC Radio 5 live
Image source, Reuters"It hit Fellaini in the midriff area and rebounded in from two or three yards out.
"West Ham came from 2-0 down at the weekend and they are going to need something just as spectacular to get back into this. It just hasn't happened for them."
West Ham 0-2 Man Utd
Martin Keown
Former Arsenal defender on BBC One
Image source, Reuters"There can be no complaints by West Ham. The ball is whipped in and Fellaini doesn't switch off, he's looking for it to come back across goal and he does well, I think it comes off his knee."
Marouane Fellaini
A second for Manchester United and it is the player some love to hate who bags it.
Marouane Fellaini both made and scored the goal as he chested down Daley Blind's cross for Jesse Lingard, who played the ball across to Anthony Martial. The forward's shot is wayward but Fellaini reacts instinctively to poke home from close range.
West Ham 0-1 Man Utd
Martin Keown
Former Arsenal defender on BBC One
Image source, AFP"There have been some great goals in this stadium but that's up there with all of them. The quality of the movement, two goalkeepers wouldn't have stopped that.
"It's great news for their club and academy. I'm sure they are all proud of what he's achieving"
West Ham 0-1 Man Utd
The Daily Telegraph's Sam Wallace is stirring it up in reference to the 'does Rooney play for England' dilemma...
West Ham 0-1 Man Utd
Phil McNulty
BBC Sport chief football writer at The Boleyn Ground
Image source, Getty ImagesWest Ham fans have been getting increasingly impatient and anxious here as Manchester United make their control count.
There has been a sense around The Boleyn Ground all season that West Ham's name is on the FA Cup in their last season here - not at the moment it isn't.
West Ham 0-1 Man Utd
"Run at their defence" is what I imagine were the words Slaven Bilic whispered into Victor Moses' ear before he sent him on.
He picks up the ball midway inside the Manchester United half and immediately charges at a retreating defence, but whacks his shot straight into a white shirt.
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West Ham 0-1 Man Utd
Slaven Bilic decides it is time for a change and Victor Moses is introduced to the action, replacing Enner Valencia. Fresh legs and pace injected into the West Ham attack.
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Image source, Getty ImagesAndrew Priestley: Forget the calls for Andy Carroll to go to the Euros, there's your wildcard choice, Marcus Rashford.
Dan Wilcox: Commentators asking if Roy Hodgson should take Rashford to the Euros. Absolutely not, he's far too young, so much to learn yet.
Josh Hammond: I don't like Van Gaal, but even i will say that his policy of giving youth a chance is excellent (and is paying off at times).
West Ham 0-1 Man Utd
The dragon has woken from its slumber. West Ham had looked ponderous after a strong start but they are alive and kicking now as Antonia wriggles past his marker on the right and he is away. Andy Carroll charges into the box but Antonio dithers long enough for Manchester United to regroup and the chance is gone.
Danny Mills
Former Man City defender on BBC Radio 5 live
"First look I think that is a penalty. There is no contact with the ball whatsoever. Daley Blind came in and took him out."
West Ham 0-1 Man Utd
West Ham are immediately on the offensive as Dimitri Payet squeezes into the area. He tumbles under the attention of a Manchester United defender, the home fans roar for a penalty but the referee waves play on.
We have an FA Cup tie on our hands now.