Scarlets are penalised for offside in the 22. This time, with the clock in the red, Liam Belcher points to the posts.

Callum Sheedy knocks it over.

Here's Eddie James scoring Scarlets' opening try.

Cardiff get to the line but Scarlets hold firm AGAIN.

The 14 men then win a penalty to clear their lines, much to the delight of the west Walian supporters on the touchline.

Not much variety from Cardiff in the 'red zone' there.

This defending will be taking a lot out of Scarlets though. They will look forward to the half-time break.

James Hook
Former Wales fly-half on BBC Two Wales

The Scarlets are defending so well but eventually something has to give.

Number eight Alun Lawrence is inches short with a charge off the line-out.

Cardiff keep trying to get over with carries before eventually spreading wide right.

Blair Murray knocks on but Mr Breakspear deems it is while wrapping in the tackle.

Josh Macleod is back on for the defensive scrum. Scarlets back to 14.

Penalties are killing Scarlets.

They are down to 13 and concede another penalty just outside the 22 after failing to release scrum-half Aled Davies shortly after an attempted choke tackle.

Cardiff, understandably, will go to the corner.

James Hook
Former Wales fly-half on BBC Two Wales

Cardiff had the numerical advantage and that's tough to defend.

It's very difficult to stop Mason Grady from that distance, even with a great effort from Eddie James.

A powerful burst by Mason Grady down the left into the 22 puts Cardiff on the attack again.

They spread to the right where Scarlets scrum-half Gareth Davies deliberately knocks the ball on.

The officials check the footage and Scarlets are down to 13 men.

Ellis Jenkins
Former Wales flanker on BBC Two Wales

Scarlets are playing with such a fast line-speed, but they've got to make sure they're matching that intensity with discipline.

Scarlets were warned earlier and now they have paid the price.

Captain Josh Macleod will have a 10-minute rest after a tackle off the ball on Callum Sheedy in the middle of the park.

James Hook
Former Wales fly-half on BBC Two Wales

That try was all about patience, sucking the Cardiff defenders in and then pulling the trigger when they've got numbers.

We're still waiting for a first score after Scarlets were sent back and back by Cardiff's aggressive defence.

The Blue and Blacks clear and missed opportunities has been the theme of the opening quarter.

Chance for Scarlets to strike after a brilliant 50:22 by Blair Murray after an aimless Cam Winnett boot down the middle.

Ellis Jenkins
Former Wales flanker on BBC Two Wales

Brilliant line-out maul defence from the Scarlets, they've been really tough.

ANOTHER blown opportunity for Cardiff. Scarlets get into the maul, hold it up and have a scrum to escape from their line.

Scarlets win a penalty, which is followed by a scuffle.

The home side have dominated the opening exchanges but are yet to make all their possession and territory count.

Cardiff win a scrum penalty and they go for the corner - they aren't entertaining going for three points.

That puts the pressure on to convert.

Their driving line-out is repelled but the hard carries come. James Botham barges over but the whistle had already gone for offside and Scarlets captain Josh Macleod is given a team warning.

James Hook
Former Wales fly-half on BBC Two Wales

Well done Scarlets, but it looked a little too easy for Cardiff to get over the try line.

More frustration for Cardiff as they are held up over the line. Good defence by Scarlets and it's still scoreless at the Arms Park.