Image source, Huw Evans Picture Agency

One man who will have a keen eye on how today progresses is Rhys Cleverly.

Why's that? Because no only is he the groundsman at the Principality Stadium, he's also plays at hooker for Caerphilly and is set to feature in tomorrow's National Bowl final against Amman United.

Read more here.

Cardiff Blues head coach Danny Wilson told BBC Scrum V:

“It was outstanding. Derbies are won on physicality and we have come in second to the Ospreys on a number of times.

“Today we definitely won that battle. We were physical, put our imprint on the game and scored some fantastic tries.

“We know we had a lot of injury problems in the middle of the season and a lot of our better players were not available to us.

“The quality has shown when they have come back in over the last few weeks.”

As it's Easter weekend, we want to hear your Easter rugby puns.

Here in Cardiff, Pearlo's given us a 9/10 effort in "Bunny Bill Williams"

Can you do better? Let us know using #BBCJDV

Image source, Huw Evans Picture Agency

How much do you know about Welsh rugby? Do you know your Shinglers from your Williamses?

Well you're in luck. We've put together the ultimate Welsh regional rugby quiz. And believe us, it's no walk in the park.

Click here and see how well you can do.

Image source, BBC Sport

They're queuing for the facilities here at the Principality Stadium before Scarlets v Newport Gwent Dragons.

In fact, they've got their priorities in order. If you're at home, get the kettle on! We've got another half an hour before the next game gets under way.

It's all over in today's first game, with Cardiff Blues coming out on top with a huge win against Ospreys.

But there's more action to come. Scarlets will take on Newport Gwent Dragons at 17:15 BST.

Cardiff Blues are deserved winners. Flanker Ellis Jenkins named man-of-the-match. The Blues go above Connacht into seventh.

Ospreys are struggling to stay in the top four.

Dan Evans gets the first try on the board for the Ospreys.

Think it is fair to say this hasn't been their day though.

Gareth Anscombe returns after his yellow card and another long period of play ends with a turnover from Blues flanker Ellis Jenkins who has been outstanding along with Josh Navidi.

Dafydd Pritchard
BBC Sport Wales at the Principality Stadium

Don't call it a comeback, as Public Enemy sang. Unless you are an extremely optimistic Ospreys fan.

They now trail 35-17 having been 35-3 behind earlier. Either this is some classic 'junk-time' scoring, or they are about to pull off a sporting miracle.

Probably the former.

Replacement centre Kieron Fonotia has made a difference as the Ospreys score their second try against 14-man Cardiff Blues.

And of all people it’s veteran former Wales prop Paul James who crashes over with Sam Davies quickly converting.

Not over yet?!

The Blues are down to 14 men again after Gareth Anscombe was sin-binned for an offence in the build-up to the Ospreys first try.

Full-back Matthew Morgan is replaced by Steve Shingler.

It has taken more than an hour but the Ospreys finally have scored their first try as they benefit from the impact of the replacements bench.

Full-back Dan Evans is the man who eventually breaches the Blues defence with Sam Davies converting.

Is the comeback on?

Cardiff Blues front-row duo Gareth Jenkins and Kristian Dacey come off after excellent matches to be replaced by Rhys Gill and Matthew Rees.

Wales scrum-half Rhys Webb has been unusually quiet today with no platform and makes way for Tom Habberfield. Tylor Ardron also comes on for Dan Baker.

Illtud Dafydd
BBC Radio Cymru

Ospreys are looking very unlike the Ospreys we have seen this season and for a few seasons actually.

The last time Steve Tandy's side lost four games in row was a dour month of October in 2014.

Another fact? You have to go back to Munster in November last year for the last time the Liberty Stadium region failed to cross the whitewash.

Five unanswered tries. Mystic Meg, Derek Acorah and Uri Geller's combined minds wouldn't even have predicted this....