What a ball in that is! Ryan Donaldson with a peach of a cross - corner. You know where this is going. Brace yourselves...

Well played David De Gea. League Two giants around his earlobes and he makes a fine punch, 30 yards.

George Thorpe: This has got replay written all over it now.

NathB: I could swear the clock is frozen! Come on Cambridge!

DT: Who is this wonderkid Luke Chadwick? Getting a lot of airtime. Hope Manchester United won't rue letting him go!

Get in touch at #bbcfacup, external, or text us on 81111 (UK only) - don't forget to say who you are and where you are texting from.

Adnan Januzaj puts over a teasing cross - but there's nobody there! A poacher would have had a tap-in. Where's Andy Cole when they need him?

Manchester United passes attempted - 526, Cambridge passes attempted - 157.

Passes don't win you matches though...

Former Cambridge United striker Steve Claridge
BBC Sport

"Great defending from Cambridge (see 78 mins) - a fantastic example of why they are still in this game. We've seen some great attacking play from Manchester United but Cambridge have been defending brilliantly. The chairman will be having a heart attack with so many players going forward though."

Image source, Getty Images

You can have your say on who should win the FA man of the match award by voting at the top of the page now. BBC One co-commentator Martin Keown has given you three options to choose from and the vote closes on 90 minutes.

Terms and conditions can be found here.

The best spell from Cambridge since the half-hour mark as Harrison Dunk weaves his way down the left. They could be caught between holding out for a lucrative replay and trying to win it here...

Phil McNulty
BBC Sport chief football writer

"First real anxiety from the home fans here at Manchester United turn up the pressure. Cambridge United have given so much here - will those tired legs bee a factor in these closing stages?"

Steve Wilson
BBC Match of the Day commentator at the Abbey Stadium

"Luke Chadwick's wife was happy he joined the club he supports, because it meant for the time in his career she didn't have to buy him a Cambridge United shirt for his birthday."

Tremendous noise still inside the Abbey Stadium, but the intensity and bounce in the stands is not being echoed by the multi-millionaires in white. having said that, there is a chance as Angel Di Maria plays a neat one-two and cuts it back, but great defending again to clear it away!

Image source, Reuters

A few of you on social media have drawn comparison between Phil Jones - taking the corners for Manchester United tonight - and former England captain David Beckham, who had rather more success as a set-piece taker.

Kane Tobias Wilson: 'Scuff It Like Jones' - the new movie celebrating the cultured right foot and legendary set-pieces of Phil Jones...

Get in touch at #bbcfacup, external, or text us on 81111 (UK only) - don't forget to say who you are and where you are texting from.

Still not one slip or lapse in concentration from the Cambridge back four and you have to admire that. They have defended their penalty area brilliantly.

And what a story this would be. Ex-Manchester United man Luke Chadwick is on for the final 15 minutes. He gets a huge ovation as he replaces Liam Hughes.

Former Cambridge United striker Steve Claridge
BBC Sport

"Cambridge have offered very little in this second half. I think there has been about three long balls forward, that's about it. But let me tell you, if they get anything out of this game they will have earned it."

That's two good chances for Manchester United now. Cambridge may not get a third life.

They are 18 minutes away from a money-spinning replay but if they are to survive that long they need to push out and try and retain the ball a bit.

Easier said than done! Obviously. But seeing out another 20 minutes of this siege looks a long shot.

Image source, Getty Images

Former Cambridge United striker Steve Claridge
BBC Sport

"Robin van Persie just didn't get his bearings right- he hit it with far too much pace when he only had to tickle it over the onrushing 'keeper. He's probably still cold- he's only been on five minutes. But what an opportunity that was."

Martin Keown
BBC Sport at the Abbey Stadium

"You expect more from Robin van Persie and a striker of his quality. He has to keep that down. Manchester United are starting to show those flashes, but they have to take those chances."

Ah it's a great chance for Manchester United. Angel Di Maria with the moment of class, had the time and space to loft a through-ball over the top to free Robin van Persie. The ball takes an awkward bounce and he is wide on the left of the goal but he hurries his shot and fires well over the bar.

Had to hit the target really.

Corner taker, playmaker, now Phil Jones shoots on the run from 30 yards. It ends up in the stands and Robin van Persie gives him a filthy look.

Image source, Empics

We are approaching the time when those huddled in the Abbey Stadium press box will be filing their first takes for tomorrow's early editions. A brave man to write his intro yet.

Surely this level of Manchester United possession must yield another clear opening?

Martin Keown
BBC Sport at the Abbey Stadium

"Manchester United will miss Fellani from the set-pieces. It could come down to that."