Gareth Delve
Former Wales international on BBC Radio Wales

It looked like the ball was short initially, but I don't think the second movement came from Ball. I think it's a try.

Celebrations are cut short.

It appears to have been a double movement from Jake Ball to get over the line.

It's a sigh of relief for Ospreys.

Scarlets bravery pays off and Jake Ball is over.

What a start.

But hold on, the TMO has spotted something here.

It's early intent from the hosts.

Scarlets back their driving maul and kick to the corner, the forwards are probing here.

It's almost a perfect start for Scarlets, they win back the kick-off and a looping pass out wide almost comes off for the flying Tom Rogers.

Image source, Huw Evans Picture Agency

It's another all-Wales set of officials.

Ben Whitehouse blows his whistle and Joe Hawkins gets us under way at Parc y Scarlets.

Gareth Griffiths
BBC Sport Wales at Parc y Scarlets

Supporters from both sides will be hoping this is not the final Christmas derby between Scarlets and Ospreys in Llanelli because of the Welsh Rugby Union (WRU) plan to cut a men's professional side.

Welsh rugby's governing body announced in October they want to reduce the amount of teams to three with licences to be granted in Cardiff, the west and east.

Negotiations have continued but WRU has announced that a decision on how a team will be cut will now not happen before the end of the year.

It seemed there would be a straight shootout between Scarlets and Ospreys for the west licence before another proposal has emerged.

That is Ospreys owners, Y11 Sports and Media, buying WRU-owned Cardiff and enabling Welsh rugby bosses to get to their magic number of three.

The WRU and Y11 have both declined to comment on this possibility, fuelling fears of Ospreys supporters about their sides' future, while Cardiff fans have been vocal on social media against any such proposed takeover deal.

One thing all supporters will agree about here today. It is cold at Parc y Scarlets

Image source, Huw Evans Picture Agency

"It's an important game in the calendar for our fans," said Scarlets head coach Dwayne Peel.

"There is a lot of tradition behind it. Before Ospreys v Scarlets it was Llanelli v Swansea and Llanelli v Neath.

"With two teams being so close, it's great for rivalry and communities. From a rugby spectacle, it has provided some good games.

"It's always been a great time of the year and I have fond memories as a player and fan."

Ospreys head coach Mark Jones said: "It's the opportunity to go up against your closest rivals, both from a community perspective but also positional rivalry within Welsh rugby.

"It brings that tribalism Welsh rugby is built on. That's the passion around the border rivalries.

"They [Scarlets] are our biggest rival, geographically and historically."

Alex Cuthbert
Former Wales winger on BBC Radio Wales

I'm expecting a fierce battle here tonight it's going to be an interesting game.

Image source, Huw Evans Picture Agency

Ospreys are missing Wales prop Gareth Thomas but number eight Ross Moriarty starts after sitting out the 26-10 home defeat against Munster.

Prop Rhys Henry is set to make his 50th Ospreys appearance.

Ospreys: Walsh; Conbeer, Watkin, K Williams, Giles; Edwards, Hardy; S Thomas, Lake (capt), Henry, Sutton, R Smith, Ratti, Deaves, Moriarty.

Replacements: Parry, G Phillips, Botha, R Davies, Morris, L Davies, Cokanasiga, Hopkins.

Image source, Huw Evans Picture Agency

Scarlets are without injured Wales quartet Blair Murray, Sam Costelow, Josh Macleod and Kemsley Mathias.

Hooker Ryan Elias takes over the captaincy from Macleod who is replaced by the returning Taine Plumtree in one of four changes from the side that beat Cardiff.

Ellis Mee switches to full-back with Joe Roberts named on the wing, while props Alec Hepburn and Archer Holz start.

Scarlets: Mee; Rogers, James, J Williams, Roberts; Hawkins; G Davies; Hepburn, Elias (capt), Holz, Lousi, Ball, Douglas, Plumtree, Anderson.

Replacements: van der Merwe, Morse, H Thomas, T Davies, Taylor, Hughes, E Price, Page.

Image source, Huw Evans Picture Agency

Fingers crossed this second Welsh derby lives up to the drama of the first.

We will talk about all the rugby politics in a minute, but first and foremost these are two sides that desperately need a win.

They've both had poor starts to the United Rugby Championship (URC), occupying the bottom two spots on the table.

Ospreys, who have only managed one league win in seven games, prop up the table with Scarlets one place above.

Let's take a look at how they line-up.

That's it from the capital, Cardiff continue their derby dominance against Dragons, but it certainly wasn't straightforward.

A late penalty try and yellow card made for a frantic finale, but it was the Blue and Blacks that retained east Wales bragging rights.

Time now to head down west where we have the small matter of Scarlets v Ospreys.

Cardiff flanker Alex Mann speaking to BBC One Wales: "I felt like we had some opportunities in the 22 where we could've been better at but I we back our system.

"As a group we've showed all season that we're tight and we'll fight together so it's pleasing to see that we've stuck with the system and we've come out on top.

"I thought the first-half was really good, but in the second-half there was twice in their 22 where I think we could've scored but we didn't and that's something we need to look at again."

Image source, Huw Evans Picture Agency

Ashton Hewitt
Former Dragons wing on Scrum V

The Dragons kept themselves in the game which will be a positive for them, but it was the inaccuracies that let them down.

We saw a number of not straight throws, the penalty count was rising, miss-kicks to touch. The mistakes just took the game away from them.

Player of the match Mason Grady speaking to BBC One Wales: "I though we'd put them away but to be fair to the Dragons they turned it around with a good counter-attack.

"I thought the boys dug in really well compared to last week and showed some real character.

"It's always tough playing the Dragons especially when they've come off two wins in a row, we knew it was going to be a hard game.

"We had some wrongs to put right from last week, and we did that."

Image source, Huw Evans Picture Agency

James Hook
Former Wales fly-half on BBC Two Wales

There's a few contenders for player of the match but it has to be Mason Grady.

He was such a threat, he had 14 carries and 11 of those crossed the gain line.

Richie Rees
Former Wales international on Scrum V Live

That last six or seven minutes was massive, the Dragons really came back into it. Mason Grady was unbelievable.

Game over.

It's that man Dan Thomas who wins the turnover and it's a huge sigh of relief for Cardiff.

Credit to Dragons though, what a finish.