Costa added late Chelsea second to Pedro opener
Lincoln produce huge upset to win at Burnley
Imps first non-league side to reach quarter-finals since 1914
Ten-man Millwall beat Leicester 1-0 with late Cummings goal
Middlesbrough 3-2 Oxford - Stuani scores late winner for Boro
Oxford had come back from 2-0 down
Huddersfield hold Man City to goalless draw
Huddersfield v Man City (15:00 GMT)
Sergio Aguero starts for Manchester City at Huddersfield, who have Kevin de Bruyne and Raheem Sterling on the bench. In total, Pep Guardiola makes eight changes.
Huddersfield make seven changes of their own.
Burnley 0-0 Lincoln
Joey Barton 'raised his hands' and as we all know, you can't do that. So he probably should have seen red. Lincoln now have a penalty appeal waved away for handball, that was never going to be given.
Image source, Reuters#bbcfacup
RegularJon: How on earth does Barton continue to get employed as a footballer? As anything? His and Burnley's behaviour very poor today
Marc Evans: Joey Barton can never keep his cool can he, another yellow. Just calm down!
Thomashollern: Burnley and Barton letting themselves down here. Barton is playing at his level today. Should be off. Ref bottled it yet again.
Image source, ReutersBurnley 0-0 Lincoln
Referee Graham Scott has been to the benches and asked both managers to help calm this game down. It's a storm in a teacup out there at the moment as Burnley send on sub Ashley Barnes, hardly a Nato peacemaker.
Millwall v Leicester (15:00 GMT)
Leicester make 10 changes to their starting XI. Only Demarai Gray retains his place.
Burnley 0-0 Lincoln
Pat Nevin
Ex-Chelsea winger on BBC Radio 5 live
Barton has slapped him in the face and the referee hasn't spotted it.
There was a plan to wind Barton up and it has worked.
Burnley 0-0 Lincoln
Image source, ReutersJoey Barton is booked. A replay shows that Barton rather slapped/pushed Terry Hawkridge, before Jon Flanagan shoved Hawkridge to the deck.
Flanagan escaped all punishment, while Barton is perhaps lucky to still be on the pitch. It's given us something to talk/write about though.
Image source, ReutersBurnley 0-0 Lincoln
Predictably there's now a scuffle with Joey Barton in the thick of it...
Image source, ReutersBurnley 0-0 Lincoln
Pat Nevin
Ex-Chelsea winger on BBC Radio 5 live
It has been a great five or 10 minutes for Lincoln.
Burnley 0-0 Lincoln
Into the last 25 minutes. A game in dire need of some quality from somewhere.
Burnley 0-0 Lincoln
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Burnley 0-0 Lincoln
Pat Nevin
Ex-Chelsea winger on BBC Radio 5 live
That is really, really, poor and disappointing from Joey Barton.
Image source, ReutersHuddersfield v Manchester City (15:00 GMT)
Huddersfield play Reading in midweek, which is in many ways a bigger game in terms of their ambitions. So it could be that Huddersfield actually make more changes than Manchester City.
Huddersfield v Manchester City (15:00 GMT)
Kevin Kilbane
Former Everton winger on Football Focus
We are looking at a record attendance today at Huddersfield. It is a huge day for them.
You have got to fancy Huddersfield the way they are playing. The momentum is with them.
Image source, Rex FeaturesWe will have team news for the three 15:00 GMT kick-offs soon. Who will make the most changes?
Burnley 0-0 Lincoln
Pat Nevin
Ex-Chelsea winger on BBC Radio 5 live
This match was two minutes old when we said Rhead v Barton would be interesting.
It has not stopped all game.
Neither of them is going to stand down.
Image source, ReutersBurnley 0-0 Lincoln
A change for Lincoln as Jack Muldoon, who missed that great early chance, comes off and Dayle Southwell comes on.
Burnley 0-0 Lincoln
Another flashpoint in the penalty area as Joey Barton goes down holding his head, with Lincoln striker Matt Rhead indicating a stamp...
The replays suggest that there was not much in either incident. Barton did kick out at the big man, who then swung an arm in Barton's direction. It's simmering. Referee Graham Scott decides to take no action.
#bbcfacup
Kyle: Very impressed with Lincoln who have more than held their own. They look comfortable and are growing in confidence.
Burnley 0-0 Lincoln
Good to see a good old A4 ring-binder being used to brief a Lincoln sub, and not a tablet. You can't break a folder, or get it too wet. Bulletproof.