Everton, Southampton and Plymouth through after extra time in day's late games
League One Cambridge Utd stun Newcastle - arguably day's biggest shock
National League North Kidderminster bridge four-division gap to beat Reading
National League Boreham Wood beat AFC Wimbledon
Championship side Huddersfield win 2-1 at Burnley
Every goal across the weekend available on BBC Sport app
Leicester 3-1 Watford
Watford building a bit of pressure in the last few moments. This goal from Harvey Barnes has made their task much harder though.
Harvey Barnes goal given by VAR to restore Leicester two-goal advantage
West Brom 1-0 Brighton
Another change for West Brom. Zac Ashworth is on for Taylor Gardner-Hickman.
Leicester 3-1 Watford
Ken Sema almost bundles his way through a load of bodies in the box but it's hastily cleared by Leicester just as he's about to shoot.
Ollie Banks
Ten-man Barrow are back in it!
And it's a screamer from Ollie Banks, who thunders a free-kick into the top corner.
Game on.
Boreham Wood 1-0 AFC Wimbledon
Marsh puts National League side Boreham Wood ahead
Could this be the goal to send Boreham Wood into the fourth round?
West Brom 1-0 Brighton
Still very tight. The Baggies make a change. Grady Diangana is on for Matt Phillips.
Newcastle 0-1 Cambridge
Tackles flying in now. Cambridge are breaking up Newcastle attacks, but not always legally...
Bryan Mbeumo (66 mins)
Ah, football.
Brentford catch Port Vale out with a swift counter attack and it's substitute Bryan Mbeumo - who has been on the pitch around four minutes - who finishes it off with a low finish past Aidan Stone.
A long way back for Port Vale from here.
Port Vale 0-1 Brentford
This is much better from Port Vale - and the home support are loving it! Brentford looked relatively comfortable, keeping the ball nicely at the start of the second half, but Vale are beginning to create some openings...
Newcastle 0-1 Cambridge
Jonathan Woodgate
Former England defender on BBC Radio 5 Live
Eddie Howe will want momentum but Newcastle are not moving the ball quick enough. They need to move it quicker and get it to Allan Saint-Maximin
Bali Mumba (Peterborough, 62 mins)
Debutant Mumba puts Peterborough 2-1 up with 'majestic' goal
Peterborough retake the lead and it comes after a fine passing move that ends with substitute Bali Mumba firing the ball into the net for a goal on his debut.
Leicester 3-1 Watford
Yay! The lights are on!
It took five minutes and 40 seconds for them to get working again so we'll have some decent stoppage time.
Watford have made three changes too. Juraj Kucka, Ken Sema and Dan Gosling are on for Ashley Fletcher, Tom Cleverley and Ozan Tufan.
Kidderminster Harriers 0-1 Reading
Omari Sterling-James has the chance to equalise for Kidderminster Harriers after stealing possession but his shot is saved by Rafael Cabral's feet.
The hosts keep plugging away.
Port Vale 0-1 Brentford
Good defending from Kristoffer Ajer! The Brentford defender beats Ben Garritty to a cross following a nice Port Vale move down the right.
It looks like Ajer may have picked up a problem in doing so, as he's replaced by Mads Roerslev. Bryan Mbeumo is also on, for Yoanne Wissa.
Boreham Wood 1-0 AFC Wimbledon
A golden chance for Boreham Wood to add to their lead and seal an upset as Tyrone Marsh plays Josh Rees through but he takes one touch too many inside the box and in the end his shot is blocked and trickles behind.
Leicester 3-1 Watford
Image source, Getty ImagesOkay this 'lights off' thing is still not sorted.
Tom Cleverley is having a chat with Brendan Rodgers. The coaches have got the balls out so the players can have a kickabout in the meantime.
Newcastle 0-1 Cambridge
Allan Saint-Maximin pick it up on the left and drives across the top of the box, David Ginola style, but then flashes a shot wide of the far post.
Max Power (Wigan)
Wigan are level. Max Power with a speculative effort from 25-30 yards out and it’s in the net.
Blackburn goalkeeper Aynsley Pears will be unhappy and think he should have saved it, but Wigan won’t care and it’s 1-1.
Newcastle 0-1 Cambridge
Stephen Warnock
Former England defender on Final Score
Image source, ReutersIt's a brilliant finish from Ironside. The turn to spin and keep if down makes it a really good finish.
It also shows the frailties of Newcastle United again. Put them under pressure and they suffer, really struggle.
Wigan 0-1 Blackburn
Ben Brereton Diaz goes for the spectacular with an overhead kick - and so nearly nails it, but his effort is just a few yards wide to deny Blackburn a second goal.