Championship side Bournemouth knocked out by non-league Boreham Wood
National League side will travel to Everton in fifth round
FT: Forest 4-1 Leicester -
FT: Liverpool 3-1 Cardiff
We've got two hours to build up to the 16:00 GMT kick-off between Midlands rivals Nottingham Forest and Leicester.
We'll have analysis from that game, plus reaction from Liverpool's win over Cardiff.
Hopefully some video will drop for you to watch as well. I'm hoping they've cut the penalty incident so you can have a proper look at it.
FT: Liverpool 3-1 Cardiff
Lovely day for Harvey Elliott, returning from a long injury lay-off with a well taken goal.
He might have been thinking whether he would actually play again after suffering that injury at Leeds.
I was doing that game and the incident looked horrific.
Good to see him back at 100%.
FT: Liverpool 3-1 Cardiff
Pat Nevin
Former Scotland winger on BBC Radio 5 Live
They now know this is the business end of the FA Cup and there is a real confidence about this group. They needed a bit more and they have got more now. Jurgen Klopp will be very happy, it was almost the dream scenario.
Liverpool 3-1 Cardiff
Liverpool get the job done in the second half and seal a place in the fifth round of the FA Cup where they will face Norwich at Anfield.
Liverpool 3-1 Cardiff
We'll do a, select your combined Liverpool and Manchester City XI when the top two go head to head in April.
That will get your little grey cells ticking. How do you fit them all in?
Liverpool 3-1 Cardiff
And goalscorer Takumi Minamino and Divock Origi are further attacking options for Jurgen Klopp.
Embarrassment of riches now?
Liverpool 3-1 Cardiff
Diogo Jota looking for a second of the game but a thumping shot is blocked by Aiden Flint.
Liverpool 3-1 Cardiff
Liverpool popping the ball around, seeing the game out.
#bbcfootball
Johnnymetal: Delighted Elliot has bagged a goal because before he got injured I felt his end product was lacking. Big future ahead for him.
Image source, Getty ImagesLiverpool 3-1 Cardiff
Thankfully for the Reds, Luis Diaz seems OK after treatment from the physio.
Liverpool 3-1 Cardiff
Hold on, this is a concern for Liverpool as Luis Diaz hits the deck following an aerial challenge, then Cardiff skipper Aiden Flint lands on the Colombian's right knee.
A painful one for the new man and Jurgen Klopp looks on wide mouthed from the touchline.
Liverpool 3-1 Cardiff
Pat Nevin
Former Scotland winger on BBC Radio 5 Live
The only question asked about Liverpool is do they have the depth of others? They are begunning to add it now. Some of it has been bought and some of it has been brought through the youth. It is very encouraging for Liverpool.
Rubin Colwill
One to tell the grandkids about.
On the counter, Cardiff pull a goal back.
The Liverpool defenders cannot deal with the pace of Isaak Davies, who finds Rubin Colwill.
The teenage Wales international controls the ball inside the box, looks up and fires a low finish past the reach of Caoimhin Kelleher.
Liverpool 3-0 Cardiff
And suddenly Liverpool's attacking options look rather good.
Mohamed Salah and Sadio Mane to come back from Afcon, to go alongside the reliable Diogo Jota, new signing Luis Diaz and impressive teenager Harvey Elliott.
Not to mention Roberto Firmino and Alex Oxlade-Chamberlain.
Liverpool 3-0 Cardiff
Pat Nevin
Former Scotland winger on BBC Radio 5 Live
There is always doubt when you are coming back from injury, there are a number of things you have to get over and a number of questions you need to answer. They are all answered within 15 minutes of being on the park.
Harvey Elliott
Terrific goal to seal the tie.
Cardiff fail to properly clear and Andrew Robertson has time to collect the ball towards the left.
The Scotland skipper sends a cross into the box which Harvey Elliott traps expert, lets the ball bounce before smashing an unstoppable finish low into the net in front of the Kop.
What a return from injury for the 18-year-old.
Liverpool 2-0 Cardiff
Could have bean a delightful third for Liverpool.
New man Luis Diaz involved again, finding Harvey Elliott, who lays it back for Jordan Henderson.
The Liverpool skipper looks to find - I think - Diogo Jota at the far post but sails wide.
Maybe he was going for goal, trying to swing one over Dillon Phillips and into the corner of the net?
#bbcfootball
Toby Bassett: Diaz with an assist and his first nutmeg, not bad.
Liverpool 2-0 Cardiff
Cardiff looking to pull one back but Jordan Hugill cannot quite connect and sends his effort wide.
#bbcfootball
Peter: Understand the Cardiff fans frustration, but to win games you have to score goals ... not indulge in "coulda, woulda, shouda"