That's all from the live commentary today - thanks for joining us. Report, reaction, player ratings and more to follow.
A great second half from Garry Monk's Swans ensures a welcome three-point haul. The result at the Liberty Stadium moved the hosts up to 10th in the Premier League table, four points clear of the drop zone where their beaten opponents remain. Cardiff are 19th, three points from safety.
Full-time: Swansea 3 Cardiff 0.
Into three minutes of added-on time.
Swansea have had seven out of 17 shots on target, with Cardiff failing to test Michel Vorm in this second half. Wayne Routledge is named Man of the Match.
Final change for Swansea: Neil Taylor ON, Dyer OFF.
Booking for Cardiff - Jordon Mutch shown a yellow card for a bad foul.
It's an emphatic close-range header from Bony, slammed past Marshall for his eighth Premier League goal of the season. The Ivorian connected firmly with a free-kick from the right by Pablo Hernandez.
GOAL! Swansea 3 (Bony 85) Cardiff 0
Swansea grab a second goal as Routledge crosses in from the left and Dyer stoops low to direct a header into the corner of the net for his fifth Premier League goal of the campaign. Swans are heading back into the top half.
GOAL! Swansea 2 (Dyer 80) Cardiff 0
From the free-kick, Williams throws himself at the ball just as Kim was turning to strike.
First booking of the game - Pablo Hernandez shown a yellow card for bringing down Mutch wide on the left.
Final change for Cardiff: Mutch ON, Zaha OFF.
Dyer has so much time to line up a shot outside the area as Turner hesitates, but his rising drive whistles over the crossbar.
Half-chances for Whittingham, Kim and McNaughton are all snuffed out by the home defence.
And a second substitution for Cardiff too: McNaughton ON, Fabio OFF.
Second change for Swansea: Jose Canas ON, De Guzman OFF.
A turn and shot from Bony, who appeals for handball as the ball hits Turner. Instead, it'll be a corner.
Britton tests Marshall from long range.
Attendance at the Liberty today is 20,402.
Chico helps a corner on to the far post and Fabio has to take evasive action as Swansea threaten to bag a second.
Past the hour mark now, and Swansea have had 60% possession overall - although Cardiff are seeing more of it at the moment. Referee Marriner is having to dampen down a few flashpoints - Bellamy on De Guzman being one of them, the Dutchman left rubbing his head.
Zaha's cross is blocked and cleared after he had made a determined run following good work by Campbell.
Caulker backs off Dyer as he advances through the middle, and is almost punished as the Swansea winger places a low shot just wide of Marshall's post.
First change for Cardiff: Campbell ON, Jones OFF.
Cardiff win a free-kick as Zaha is wrestled to the ground by Rangel. Bellamy curls the ball in but it's just out of reach for Ben Turner, rising above Davies.
Bellamy so close! From the left, he accelerates past Chico at the top of the box and strikes a firm rising shot that pings off the crossbar.
Wayne Routledge opens the scoring, taking advantage of poor positioning from Fabio to scamper away down the left after Pablo's excellent stabbed pass and finish past Marshall. Ashley Williams goes to celebrate with Garry Monk.
GOAL! Swansea 1 (Routledge 47) Cardiff 0
Emnes picked up a hamstring strain in that first half.
Swansea get the second half underway.
First substitution confirmed, for Swansea: Pablo Hernandez ON, Emnes OFF (46).
The players are coming back out onto the pitch.
Pablo Hernandez is going to come on for Swansea for the second half.
Live in-play betting odds from Sky Bet. Cardiff are now 100/30, Swansea are 11/10 and the draw is 6/4. Zaha to score next is 14/1, while if you fancy Dyer, he's 20/1. More Price Boosts at SkyBet.com.
SNF studio guest Dean Saunders says "pride" is having a big effect as neither team fears gambling in case they lose: "Swansea came out of the traps brilliantly. The front four have some pace." Jamie Redknapp: "Cardiff look quite dangerous."
Chris Green from Huddersfield has emailed in to say: "Cardiff to win 2-0, with Zaha and Jones scoring the goals." Simon Wheatley from Leeds fancies the home side: "I feel Swansea might just grab a late winner."
Half-time at the Liberty: Swansea 0 Cardiff 0. Only brief glimpses of quality in the first 45 minutes. What did you make of the first half? Let me know. Email me on firstname.lastname@example.org or tweet me on @jonboy79.
Caulker fails to clear properly and is then confronted by Routledge, who gets a shot away through his legs, but it's straight at Marshall.
One additional minute to be played before the break.
Awful attempt from Zaha, as he comes infield to elude Britton at the top of the box only to slice a left-footed shot about as badly as you could imagine.
Swansea have had six shots to Cardiff's four, with both sides only able to get one of those efforts on target so far.
Swansea respond with a great chance of their own, as Dyer and Rangel link up well on the right and Dyer sends a low cross right across the face of goal. None of his team-mates have pushed forward enough to connect, however.
Best chance we've had for a while, as Whittingham wraps his left boot round the ball 30 yards out and sees his shot curl inwardly towards Vorm's goal - but the Swansea keeper makes the save.
Disappointing spell in the game, with neither team able to make much progress towards their opponents' goal.
Emnes does well to bring the ball down on the left edge of the area, but support is lacking and he ends up swinging in a very hopeful cross that bounces out.
Bellamy surges forward down the left and plays an excellent one-two with Declan John. It looks like Jones is in to finish off the move but Ben Davies does brilliantly to put the Cardiff striker off, and the ball goes wide.
Bellamy has to leave the ball for Whittingham in the area as he was offside when the pass forward was made, and Cardiff can't quite get a clear chance.
An ambitious effort from Bony in the pouring rain bounces well wide. Swansea have had 65% possession to Cardiff's 35% so far in the first half.
De Guzman gets a sight of goal, set up by Dyer, but he fires high and wide. Some big tackles going in.
Williams clears Fabio's right-wing cross out for a throw-in. From the throw, Bellamy gets away down the right and delivers a ball for Jones but he heads wide under pressure from Chico.
Zaha lucky to escape a booking after appearing to raise his hands to Angel Rangel during an argument off the ball.
Routledge and Emnes are linking up well down the left, but the latter's cross is easily claimed by Marshall.
A win for Cardiff today would complete the first season double in the South Wales derby in the 102-year history of the fixture.
Replays show Marshall got a decent right hand to the ball after De Guzman's pass into the area had released Bony. Good decision by Mr Marriner.
Big decision from Andre Marriner as Bony attempts to go round Marshall - but the referee decides that the Cardiff goalkeeper did not impede the Ivorian unduly in the area. Looked like Marshall got his hand to the ball.
The players might struggle to keep their feet at times on what is a sodden surface at the Liberty Stadium.
Marshall has to make a save - a comfortable one - from Routledge in the first minute after Emnes had put him into the box, down the left channel.
And Cardiff get us underway...
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In the Sky Bet odds, Swansea are 10/11 favourites, you can get 13/5 on the draw, and Cardiff are 14/5 shots.
A few words from Garry Monk now: "Nearly every footballer has experienced this type of situation, so we're just focused on the football. Rangel and Britton are experienced in this sort of fixture. Emnes has impressed me in training. The crowd will be boosted by Michel Vorm's return too. I want my players to show a bit of passion and pride. They have a whole army out there backing them. It's just unfortunate I'm not out there on the pitch with them!"
The players are out on the Liberty Stadium pitch. Cardiff's Steven Caulker has been talking to us too: "Three points is even more important in a derby. You never know (if it's a good time to play Swansea or not), but we're confident."
Not long until kick-off. Here's Swansea captain Ashley Williams: "We're focused more than ever - I feel it's the best we've had this season. We're ready for the game. Garry has looked to stamp his authority on the sesssions, and he's got the respect of everyone. We don't owe Cardiff one - we owe ourselves one. Recent performances have not been good enough."
More from Huw Jenkins on Laudrup's dismissal: "Only time will tell whether the timing was right, but in the end we had to get back to basics for the betterment of Swansea City. We need to work as one with a strong belief that we can compete with everyone in everything we do."
Meanwhile, Swansea chairman Huw Jenkins has been explaining the sacking of Michael Laudrup in his programme notes: "Changing a manager mid-season is not always a wise choice unless, of course, there is good cause and solid reason. Collectively as a board we assessed every aspect surrounding the way our first-team staff and squad was working on a day-to-day basis. Without going into detail, it was clear to all of our directors that the strong principles we have had at Swansea City over the last 10 years were slowly being eroded."
Interesting decision by Monk to include Chico in his first Swansea line-up. Flores was recently involved in a training-ground row with Monk - installed as head coach after the dismissal of Michael Laudrup this week - but he partners captain Ashley Williams in defence, with loan signing Marvin Emnes is handed his first start since joining from Middlesbrough.
Ole Gunnar Solskjaer makes two changes to the Cardiff side that began the 2-1 home win over Norwich last time out. Noone and Mutch drop to the bench as Zaha makes his first start and Kim returns to the line-up.
Garry Monk makes four changes to the Swans team that lost 2-0 at West Ham. Vorm, Rangel, Britton and Emnes come in. Tremmel and Amt drop to the bench. Tiendalli and Shelvey (hamstring) are not involved today, and Michu is not yet fit.
Cardiff bench: Lewis; Campbell, Noone, Mutch, McNaughton, Dæhli, Cala.
Swansea bench: Tremmel, Amat, Taylor, Canas, Hernandez, Lamah, Ngog.
Cardiff team: Marshall; John, Caulker (c), Turner, Fabio; Whittingham, Medel, Kim, Zaha; Bellamy, Jones.
Swansea team: Vorm, Rangel, Chico, Williams (c), Davies, Britton, de Guzman, Emnes, Dyer, Routledge, Bony.
Both starting line-ups have been announced. Here we go...
Welcome along to our live coverage of the Saturday Night Football clash in south Wales - it's Swansea v Cardiff at the Liberty Stadium, and kick-off is at 5.30pm. Watch SNF from 5pm on Sky Sports 1HD to see all the action.