- Jesse Lingard brace seals comfortable victory for United at the Liberty Stadium.
- The midfielder opened the scoring after 21 minutes, producing an accurate finish after a clever flick through from Marcus Rashford.
- He doubled his tally with a sumptuous header from the edge of the box on the hour.
- United will learn their quarter-final opponents on Thursday.
United ease their way into the last eight of this competition thanks to a couple of sublime finishes from the Jesse Lingard. Greater tests lie ahead but that was exactly the sort of performance Jose Mourinho will have been looking for after Saturday 's defeat to Huddersfield; polished and professional.
That's it for our coverage, thanks for stopping by.
Full-time: Swansea City 0-2 Manchester United
Brilliant from Romero! The Argentine produces a stunning reaction save to keep out Fer's point blank effort and keep his clean sheet intact. Swansea throw another corner in but this time the Argentine comes out to claim. That should be that.
A deflected effort from Naughton forces Romero to scamper across goal but the deflection takes it out for a corner in what should be the last action of this contest.
This game is easing it's way to an uneventful conclusion; United are satisfied with two goals and Swansea seem fine with that arrangement too. Three minutes of time added on.
Here comes that change; Martial makes way and Luke Shaw is on for the final five minutes.
Luke Shaw is getting ready to come on now.
Lingard wants that hat-trick. Darmian shifts the ball inside to him and runs towards the byline looking for the return but Lingard understandably fancies a crack at goal, driving a low effort on target that is kept out by the Swansea goalkeeper.
Daley Blind now picks up a yellow card for cynically stepping across Routledge who was looking to break down the right flank.
Ayew curls the free kick over the wall but straight into Romero's arms.
The resulting corner is overhit but Abraham keeps the ball in play, knocking it back across goal where Routledge is cleaned out by a late challenge from Tuanzebe. It's a Swansea free kick and the United teenager is shown a yellow card.
Tammy Abraham has already improved Swansea, immediately holding the ball up well for his side before waking Romero up with a distant effort from range that the Argentine has to palm over the bar.
Paul Clement makes his final change, throwing on Tammy Abraham for McBurnie.
McTominay is growing in confidence now; he coolly carries the ball out from defence, side-stepping a challenge before being clipped by Ki who earns himself a booking.
McTominay almost scampers through on goal but is made to settle for a corner. The midfielder wins the header, drawing a save out of Nordfeldt with Tuanzebe getting to the rebound, but he fires over the bar from yards out.
Here's Swansea's second change of the evening too with Leroy Fer on for Mesa.
Here's a couple of changes from United; not two you would have expected, mind. Romelu Lukaku and Nemanja Matic are on for the final 25 minutes with the game effectively over, replacing Rashford and Herrera.
Here's Jesse Lingard finding the back of the net with a header from a couple of yards inside the Swansea box. Yes, you read that right.
Lingard in for a hat-trick! Blind plays a clever ball down the inside left channel for his teammate to run onto and he takes the shot on. It's from a very tough angle however and he can;t find the target, firing across the face of goal.
That's two finishes of the very highest quality from Jesse Lingard tonight.
Brillliant from Lingard! Tuanzebe starts the move, shifting the ball wide to Darmian who whips an inviting ball towards the box. Lingard has already started his run and meets the cross right on the edge of the box, guiding a stunning header past the Swansea goalkeeper! That's an outrageous finish.
Goal! Swansea City 0-2 Manchester United (Jesse Lingard, 59)
Rashford, who has popped up out on the right, fizzes a wonderful ball across goal but Martial is the only United player in the box and isn't quite able to scamper onto the end of it.
Clucas now clatters into Rashford, wiping out the United forward about 40 yards out from goal. That challenge earns him a yellow card.