Dafydd James
Former Lions and Wales back on BBC Radio Wales

Very nonchalantly slotted over there, McKenzie struck that right between the uprights, looking very relaxed with his socks around his ankles.

Cardiff Blues collapse a scrum and Ospreys outside-half Marty McKenzie slots over the opening penalty points.

First blow to the hosts.

Referee Dan Jones has blown his whistle and the second Welsh derby of the Pro14 festive schedule is under way.

Cardiff Blues head coach John Mulvihill has been making mischief in the pre-match build-up this week as he recognises the region's poor record at the Liberty Stadium and what he perceives as the Ospreys' opinion of his side.

"Our record down there hasn't been good in the last 13 years, it's something we need to right this week," he said.

"They question the heart, resolve and fight that capital teams have, we're [supposedly] all born with silver spoons in our mouth and get things easy."

Ouch!

Ospreys have won only once in 11 outings in the league and European Cup this season, but have dominated this fixture in recent times.

Cardiff Blues have not won a league match in Swansea since 2005.

Cardiff Blues have three wins from seven in Conference B this season, while Ospreys have just one victory in Conference A.

Wales flanker Justin Tipuric returns to captain Ospreys against Cardiff Blues in his first appearance for his region this season.

Scott Otten will make his 100th appearance in a team showing six changes from the 40-27 loss against Racing 92 on 13 December.

Ospreys recall Wales internationals Scott Williams, Aled Davies and Bradley Davies with wing Hanno Dirksen and number eight Olly Cracknell completing the changes.

Cardiff Blues made two changes from their defeat in Pau. Brad Thyer comes in at loose-head for his 50th Pro14 appearance and ex-Osprey James Ratti packs down in the second row.

Ospreys: Evans; Dirksen, Thomas-Wheeler, S Williams, Morgan; McKenzie, A Davies; Smith, Otten, Fia, Beard, B Davies, Lydiate, Tipuric (capt), Cracknell. Replacements: Lake, Fawcett, Gardiner, Orie, Morris, Venter, Price, K Williams.

Cardiff Blues: Morgan; Lane, Lee-Lo, Thomas, Adams; Evans, Williams; Thyer, Myhill, Andrews, Paulo, Ratti, Lewis-Hughes, Boyde (capt.), Turnbull Replacements: Belcher, Gill, Assiratti, Cook, Robinson, Williams, Tovey, Amos.

Well, what a dramatic first Welsh derby of the evening.

Sam Davies and his Dragons team-mates have set a high standard for drama for Ospreys and Cardiff Blues to follow.

Can they serve up a game of similar excitement?

Gareth Griffiths is at the Liberty Stadium to find out, so I'll hand over to Gareth to guide you through tonight's events in Swansea.

What an end to the game!

Dragons fly-half Sam Davies hits the match-winning drop-goal with the last kick of the game to spark delirious celebrations at Rodney Parade.

And another!

Dragons are penalised for entering a maul from the side and Leigh Halfpenny has a chance to regain Scarlets' lead from the left flank.

That dependable right boot does the trick again.

With just four minutes left, this is getting tense now!

There's the breakthrough!

Scarlets lock Sam Lousi is offside and he knows it's a big mistake as he puts his hands on his head.

He is duly punished by Dragons fly-half Sam Davies, who strikes with his fourth penalty of the match to put his team back in front.

Who's going to blink first?

We're into the 69th minute and a game of kicking tennis has broken out, both teams desperately trying to avoid making an error in a dangerous position in these wretched conditions.

Adrian Hadley
Former Wales international on BBC Radio Wales

You've got Jack Dixon throwing a 10m pass to Ross Moriarty, 10-15m behind the gainline, you're never going to make yardage if you do that.

There's something quite pleasing about a good ankle tap, isn't there?

Dragons skipper Rhodri Williams looks like he's away down the left wing but he's stopped in his tracks by an outstretched hand from Scarlets flanker Josh Macleod, who then needs treatment after the incident.

That's Williams' last act by the way - he's replaced by Tavis Knoyle, another former Scarlet.

Nick Webb
BBC Sport Wales

The Dragons defence has been pretty good today, it was only when they were down to 14 men that they've buckled.

Adrian Hadley
Former Wales international on BBC Radio Wales

They're making too many mistakes at the minute, the Dragons.

They're just handing the ball over yet again to the Scarlets.

I'm pretty sure the Scarlets will take one of these opportunities that they're being given.

It's all getting a bit scrappy now.

The rain is still pouring and the handling errors keep coming.

Dragons make two changes in the front row and all four players involved are Wales internationals.

Off go hooker Elliot Dee and prop Leon Brown, on come Richard Hibbard and Aaron Jarvis.

A significant change for Dragons and Wales as Ross Moriarty replaces Taine Basham in the back row.

This is Moriarty's first appearance for Dragons since suffering from a virus during the World Cup in Japan.

The second half has not quite started in the same vein as the first.

Scarlets seem content to take their time as they await prop Wyn Jones' return from the sin-bin.

Adrian Hadley
Former Wales international on BBC Radio Wales

The Dragons aren't making much ground because the delivery from Rhodri Williams is so slow and the Scarlets defence is straight up.

What an eventful first half!

A few players are breathing heavily with their hands on their heads and who can blame them?

An opening 40 minutes packed with incident and played at a relentless pace.

Fingers crossed for more of the same in the second half...