Final Score - red button, online & BBC One
Will Grigg scores twice as Wigan beat 10-man West Ham
Notts County take Swansea to a replay, Southampton beat Watford
Football's frightening mascots
Image source, Getty ImagesHow did you sleep last night?
Well? Really? Well, you clearly did not look into the unblinking eyes of Yeovil's Jolly Green Giant.
We want your nominations for the most disturbing mascots in football today.
Hit us up on #bbcfacup, external or 81111 on text.
Notts County v Swansea (15:00 GMT)
Football Focus
Notts County Chairman Alan Hardy: "This is what dreams are made of - it's great having teams like Swansea come to Meadow Lane - let's just hope we can give them a good game and hopefully get a result."
Notts County assistant manager Mark Crossley: "It's been great working with Kevin Nolan - he's got a real aura around him. He was a real leader on the pitch, and you know when he steps in that dressing room, the players really sit up and listen.
"We've had are normal preparations throughout the week, but we're going to have a real go. We know Swansea are going to have a lot of the ball, but there will always be a black and white shirt in their face."
Mark Lawrenson usually just has 10 Premier League games to get his head around.
This week he has been working predictions overtime - all 16 FA Cup fourth-round ties, weighed, measured and dispatched.
His opponents? Only Copa90 stalwarts Vuj and Poet.
Old-school punditry versus the new breed.
Peterborough 1-3 Leicester
There is one game already up and running this afternoon.
And Kelechi Iheanacho's white-hot streak in the FA Cup has continued.
The Leicester striker, who scored both goals in the Foxes' win over Fleetwood in the previous round, has hit another double to take the Premier League side out into a 3-0 lead away to Peterborough.
He has nine goals in nine FA Cup games across his career so far.
Posh have just nicked one back though. Half an hour left. Could they?
Head across to Patrick Jennings' live text over here. But come right back here by return of post.
#FAPeoplesCup
Fancy a bit of (potential) giant killing yourself?
Why not sign up for the FA People's Cup - the nation's most inclusive five-a-side competition.
It's free and there are 18 different categories so something for everybody.
Find up all the details here and give it a go!
FA People's Cup 2018: Sign up for the nation's most inclusive five-a-side competition
BBC Radio 5 live
Image source, RexYou have landed right in the epicentre of an FA Cup fever outbreak.
The oldest club competition in the world is coming at you at every modern angle this afternoon with the BBC's television, radio and online coverage.
Here is the full listing, which is practically half a Radio Times. Fortunately all of this goodness will flow seamlessly in at the top of this page.
All times GM to the T.
Final Score
BBC Red Button, 14:30 and BBC One, 16:30.
Wigan v West Ham
BBC Radio 5 live sports extra, 14:55.
Notts County v Swansea
BBC Radio 5 live, 15:00.
FA Cup goals
BBC Red Button, 17:25.
Newport County v Tottenham
BBC Radio 5 live, 17:30.
Liverpool v West Brom
BBC Radio 5 live, 19:45.
#bbcfacup or 81111 on text
Dave: Waiting for Dad in the pouring rain at Milton Keynes Central.This is the magic of the cup!
Image source, Getty ImagesThese are this afternoon's kick-offs, all 15:00 GMT unless otherwise mentioned.
There is plenty to get your teeth into there with Nottingham Forest, conquerors of Arsenal in the last round, heading to fellow Championship side Hull while Javi Gracia makes his managerial bow for Watford away to Southampton.
Click through for all the early team news, manager thoughts and pre-match stats.
Image source, RexYep, if you are still in it at this stage, it is time to start thinking about the FA Cup long haul.
Manchester United and Sheffield Wednesday - winners of the big pot 15 times between them - booked their place in the last 16 last night.
Who will join them this afternoon?
Four games to Wembley.
Image source, GettyFive games to the final.
Image source, Getty ImagesSix games from unthinkable glory.
Image source, Reuters