Postpublished at 86 mins
Swansea 1-0 Cardiff
Cardiff have another chance to send the ball into the box from a set-piece.
Aaron Ramsey's free-kick reaches Nat Phillips, but he is stretching and can only head well wide.
Cullen & Lowe goals give Swansea win over Cardiff in early Championship game
Cullen also put penalty wide early in second half
Swansea have now won eight of the last 10 south Wales derbies
Swansea move eight points clear of the drop zone
Cardiff stay five points outside the play-offs
Gareth Vincent
Swansea 1-0 Cardiff
Cardiff have another chance to send the ball into the box from a set-piece.
Aaron Ramsey's free-kick reaches Nat Phillips, but he is stretching and can only head well wide.
Swansea 1-0 Cardiff
Ollie Tanner busts into space down the Cardiff right and pulls back for Karlan Grant, but his first touch takes him away from goal and his cross-shot drifts away to safety.
Swansea are looking nervy now.
Swansea 1-0 Cardiff
Jason Perry
Former Cardiff defender on BBC Radio Wales
As much as Cardiff have been better in this second half they haven't troubled Carl Rushworth in goal.
Swansea haven't been as comfortable as they were in the first, but they're in the driving seat.
Swansea 1-0 Cardiff
Cardiff are throwing bodies forward in greater numbers now.
They have no choice but to gamble as the clock begins to tick down.
Swansea 1-0 Cardiff
Swansea enjoy a good spell of possession which ends with Przemyslaw Placheta crossing dangerously towards Ollie Cooper, but Dimitrios Goutas slides in to clear.
Swansea 1-0 Cardiff
Cardiff make an attacking change as Famara Diedhiou replaces Josh Wilson-Esbrand.
Swansea 1-0 Cardiff
Jason Perry
Former Cardiff defender on BBC Radio Wales
Cardiff have gone from two sitting midfielders to now just having Ryan Wintle with Rubin Colwill and Aaron Ramsey ahead of them.
They can split open defences and Cardiff already look better in possession. The only problem is there's now more space for Swansea's two wide players cutting in.
It is a good game and Cardiff are now in it!
Swansea 1-0 Cardiff
Matt Grimes takes the free-kick and Ethan Horvath gathers comfortably.
Swansea 1-0 Cardiff
Swansea have a free-kick in a dangerous area after Aaron Ramsey's foul on Ollie Cooper.
Swansea 1-0 Cardiff
Swansea boss Luke Williams is barking at his players, urging them to keep the intensity in the final quarter of this game.
Cardiff are right in this contest.
Swansea 1-0 Cardiff
Owain Tudur Jones
Former Swansea and Wales midfielder on BBC Radio Wales
Luke Williams isn't going to take Joe Allen off while Erol Bulut brings Aaron Ramsey on?
We want to see that battle!
Swansea 1-0 Cardiff
Swansea make a triple change, with Jamal Lowe, Ollie Cooper and Jay Fulton on for Jamie Paterson, Joe Allen and goalscorer Liam Cullen.
There is a notable change for Cardiff, too, with Wales captain Aaron Ramsey on for Manolis Siopis.
Swansea 1-0 Cardiff
Owain Tudur Jones
Former Swansea and Wales midfielder on BBC Radio Wales
Liam Cullen can't believe it, he's made the space for himself.
Matt Grimes starts it all building from the back and Cullen is in so much space, almost on his knees with a diving header.
He could have had three!
Swansea 1-0 Cardiff
Almost from nothing, Swansea carve a golden chance to double their lead as Ronald crosses from the left for the unmarked Liam Cullen, but he heads harmlessly wide.
That was a big opportunity for the home side.
Swansea 1-0 Cardiff
Jason Perry
Former Cardiff defender on BBC Radio Wales
I'm not sure if it's that Cardiff City are playing better in this half or that Swansea have sat back on their lead.
Or maybe it's a little bit of both.
Swansea 1-0 Cardiff
Dafydd Pritchard
BBC Sport Wales at the Swansea.com Stadium
Swansea have made a habit of starting strongly, getting into a winning position and letting the nerves creep in.
They've still clearly got the upper hand in this game - but they're just starting to give Cardiff a glimmer of hope.
Swansea 1-0 Cardiff
Cardiff make another change as Ollie Tanner replaces Josh Bowler.
Tanner has one Cardiff goal to his name - against Swansea last September.
Swansea 1-0 Cardiff
Cardiff are asking questions of Swansea for the first time in the contest.
The home side dominated before the break, but it is a different story now.
Swansea 1-0 Cardiff
Jason Perry
Former Cardiff defender on BBC Radio Wales
That was Cardiff's best chance. At first I was cursing Josh Bowler saying 'Put it in with your right foot'.
But he pulls it back and Rubin Colwill and he's just got to get it on target. Had to work the keeper.
But it's better from Cardiff, playing further up the pitch.
Swansea 1-0 Cardiff
Cardiff come forward again, with Josh Bowler driving down the right before pulling back for Rubin Colwiil.
He strikes the ball beautifully, but the shot is too high and sails into the crowd.
Erol Bulut will be encouraged, however.