Dave Nugent is on now for Boro as we tick into the last five minutes. Will it be extra-time?

Image source, PA

All over! City ease through. 

Still 10 minutes (at the very least) left at Old Trafford. Dave Nugent is warming up for Boro as Chris Smalling heads wide at the other end. 

A huge, trademark grin on the face of Jurgen Klopp as he strides out onto the Anfield pitch to celebrate with his players. He seems to single out Joe Allen for some specific, lengthy advice...

Yep, there it is!

Image source, Reuters

Too little too late for Villa.

Sinclair's penalty was almost the last kick of the game and Saints march on into the quarter-finals.

Into added time at Anfield. Jurgen Klopp's first win?

Jordan Ayew tripped. Scott Sinclair to take for Villa.

Into added time at Anfield. (Some) Liverpool fans on our social media channels have a new scapegoat...

Tim Purcell: I 'd like to copyright the hashtag #havingadivock, external as I suspect we might see it quite a lot in future   

Chris Bevan
BBC Sport at Etihad Stadium

The scoreline is harsh on Palace, who have had some decent openings in an open game but they missed their best chance when Joe Ledley fired over a gaping goal at 2-0 and they have never seriously looked like getting back in this game since.

Their fans, many of whom left south-east London on club coaches this morning, face a long journey home but at least they have a chance of some revenge against Manchester this weekend - United come to Selhurst Park on Saturday.

Anthony Martial is on for United and straight away takes two men on down the left. Can anyone find a winner or are we heading to extra time?

Bournemouth sub Tokelo Rantie has not scored for over a year - what a time it would be to break his duck now. The South African looks up, sets his sights on the Liverpool goal, but puts a bit too much beef into his shot from 18 yards. Over the bar. Into the final five minutes...

Adam Williams
BBC Sport at St Mary's

Villa fans begin to file out as Ashley Westwood flashes a shot well over from distance.

There's been plenty of huff and puff from the visitors tonight, but not a lot of end product.

Some of that contingent of away supporters have been chanting, "We want our Villa back" at times this evening.

Ten minutes for Bournemouth to rain on Klopp's parade. And they hope South African striker Tokelo Rantie can help them spoil the German's evening. He replaces Junior Stanislas, who has been the Cherries' most potent attacking threat tonight.

Image source, Reuters

Another moment of calamity at the back for Manchester United as keeper Sergio Romero completely miskicks a Daley Blind backpass, Bryan Gunn style, and the ball drifts just wide!

Boro then have another effort as Grant Leadbitter calls Romero into action at his near post. 

Chris Bevan
BBC Sport at Etihad Stadium

Just before City's fourth goal, the home fans gave a standing ovation to their £54m man Kevin de Bruyne as he left the pitch, to be replaced by 18-year-old winger Patrick Roberts for his first appearance at Etihad since his £12m summer move from Fulham.

A goal and an assist for the Belgian tonight, which is fast becoming his expected return.

Bournemouth's Shaun MacDonald sees his name taken by referee Mike Jones for a cynical bodycheck on Joe Allen. "Me?" says MacDonald as he pleads innocence. Yes you Shaun.

Joao Carlos Teixeira licks his lips as he hovers over the set-piece, curling a delicious shot towards the bottom corner. But away keeper Adam Federici is equal to it.