FT: Everton 5-4 Spurs - After finishing 4-4, Bernard strikes in extra time
FT: Leicester 1-0 Brighton - Iheanacho strikes in injury time
FT: Sheffield United 1-0 Bristol City - Sharp penalty after Mawson red card for handball
FT: Swansea 1-3 Man City - City first top-flight English side to win 15 consecutive games in all competitions
Swansea v Manchester City (17:30 GMT)
Around half an hour to kick-off. Both sets of the players are being put through their paces on the pitch.
Predictions? Comfortable win for Manchester City? Or do Swansea have a trick up their sleeve?
Swansea v Manchester City (17:30 GMT)
Image source, Getty ImagesPhil Foden could become the first Manchester City player to score in the third, fourth and fifth rounds of the competition in the same season since Shaun Goater in 2000-01.
He'll have to do it off the bench. Foden has been left out of the starting line-up.
Swansea v Manchester City (17:30 GMT)
Image source, Getty ImagesPep Guardiola says Manchester City 'suffered incredibly' on their last visit to Swansea two years ago.
"Swansea have a tradition of managers," said Guardiola when asked to recall his memories when his side found themselves 2-0 down before coming back to win 3-2 two years ago.
"Laudrup, Martinez, Potter was there, we suffer a lot there, 2-0 down, third goal was offside, it was a difficult day. I don’t expect a different game to two seasons ago when we suffered incredibly.
"I know about the consistency, defensively they don’t give chances and goals, they are so solid in this formation, they have quality up front, quality in the middle.
It will be a difficult test, we have to do a good performance."
Swansea v Manchester City (17:30 GMT)
Last time these sides met in the FA Cup Swansea raced into a 2-0 lead - check out the second goal, a peach - but Manchester City still raced back to win.
Just listen to that sound of a full house. Nostalgic.
BBC Radio 5 Live Sports Extra
You can listen to commentary of two of today's four ties on BBC Radio 5 Live Sports Extra.
Build-up to Swansea against Manchester City starts at 17:25 GMT. Once that tie finishes focus switches to the all-Premier League match between Leicester and Brighton which kicks-off at 19:30.
Image source, Getty ImagesHaving a bad day? It cannot be any worse than the one Burnley experienced on Tuesday.
Not only did they go out of the FA Cup after being beaten at home by Championship side Bournemouth, they were left red-faced after they named a suspended player in their line-up.
Left-back Erik Pieters was picked for the match at Turf Moor - but Bournemouth noticed he was ineligible after being booked against MK Dons and Fulham in the previous two rounds.
"To be fair to Bournemouth, they flagged it and mentioned it, so credit to them for a bit of gentlemanly conduct," said Clarets boss Sean Dyche.
Swansea v Manchester City (17:30 GMT)
Swansea City may be taking on the top team in the land right now, but that does not stop Steve Cooper making five changes to the side which beat Norwich last time out.
Defender Joel Latibeaudiere starts against his former club, while USA international Jordan Morris makes his first Swansea start after signing last month.
Pep Guardiola makes seven changes following Manchester City's weekend win at Liverpool, with Ederson, Ruben Dias and Phil Foden among those dropping out.
The whole back four is new, while there are also starts for the likes of Ferran Torres and Gabriel Jesus as Raheem Sterling captains the visitors.
Swansea: Woodman, Roberts, Cabango, Latibeaudiere, Guehi, Manning, Grimes, Fulton, Dhanda, Morris, Lowe.
Substitutes: Webb, Naughton, Bennett, Freeman, Bidwell, Hourihane, Arriola, Ayew, Whittaker.
Manchester City: Steffen, Walker, Garcia, Laporte, Mendy, Rodrigo, Gundogan, Bernardo, Torres, Sterling, Jesus.
Substitutes: Ederson, Stones, Zinchenko, Mahrez, Cancelo, Foden, Doyle, Gomes, Bernabe.
#bbcfootball or text 81111 (UK only)
Is there any stopping Manchester City? Will Bristol City surprise Sheffield United? Who will come out on top between Carlo Ancelotti and Jose Mourinho? And are you a fan of midweek FA Cup action?
Tweet us on #bbcfootball or text in.
BBC iPlayer
Fancy watching some live FA Cup action?
Championship side Bristol City's game at Premier League strugglers Sheffield United is live on the Red Button, BBC iPlayer and BBC Sport website from 19:00 GMT.
Kick-off at Bramall Lane is 19:30 GMT.
Swansea v Manchester City (17:30 GMT)
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Image source, ReutersBournemouth and Manchester United are through. Who will be joining them in the quarter-finals?
17:30 GMT: Swansea City v Manchester City
19:30 GMT: Leicester City v Brighton & Hove Albion
19:30 GMT: Sheffield United v Bristol City
20:15 GMT: Everton v Tottenham Hotspur
Swansea v Manchester City (17:30 GMT)
Five changes for Swansea who include former Manchester City youth defender Joel Latibeaudiere. Forward Jordan Morris makes his full debut after signing on loan from Seattle Sounders.
Manchester City's starting line-up includes Ilkay Gundogan, Raheem Sterling and Gabriel Jesus.
Full team news coming up.
Image source, ReutersIs history about to repeat itself for ruthless Manchester City?
The last time Pep Guardiola's side faced Swansea they went on to claim ahistoric domestic treble.
Two years on and they're top of the Premier League and in the Carabao Cup final as they prepare to meet the Swans again in the FA Cup.
Will anyone stop them?