Ben Whitehouse finally goes to his pocket and Cardiff lock Josh McNally is shown a yellow card for slowing the ball down.

James Hook
Former Wales fly-half on BBC Radio Wales

Alex Mann has made a big impact since coming on. He's been involved a couple of times at the charge downs.

That was Cardiff's first proper period of possession.

James Hook
Former Wales fly-half on BBC Radio Wales

That's a nice strike by Angus O'Brien.

Filo Tiatia will be delighted with the start.

The Dragons skipper has found his groove now and slots over another three points for the visitors.

Matt Lloyd
BBC Sport at Cardiff Arms Park

Wow, Alex Mann's first touch of the season and he almost sets up a try.

He charged down Rhodri Williams' box kick deep inside the Dragons half but the visitors scramble it clear.

Welcome back Mann.

Ben Whitehouse gave Cardiff a warning a few minutes ago.

Cardiff have since conceded two more penalties, but still no card.

Matt Lloyd
BBC Sport at Cardiff Arms Park

That looked such an innocuous collision between Ben Donnell and wing Harri Millard but strangely it's the big back row who comes off worse.

He is really holding that left arm gingerly in a position that suggests a dislocated shoulder.

Shame because he's had such a good season so far.

Image source, Huw Evans Picture Agency

That's a nasty looking injury to Cardiff's Ben Donnell.

He leaves the pitch clutching his arm in his shirt.

Alex Mann is on in his place and makes an instant impact.

James Hook
Former Wales fly-half on BBC Radio Wales

They are the kicks you want after missing a couple!

James Hook
Former Wales fly-half on BBC Radio Wales

Again, that's good play from the Dragons, some good carries from Rosser. Aneurin Owen, another good carry. Harry Wilson with that line... it was a great line to take, he just couldn't hold the ball.

The skipper finally takes his chance to put Dragons in front.

Dragons are continuing to ask questions of the Cardiff defence.

Referee Ben Whitehouse is having a word with Ben Thomas, with the penalty count creeping up.

The next one will be yellow.

We've seen some magic from Cameron Winnett, now it's time for Aneurin Owen to show what he can do with a show and go.

It's a try-saving tackle by Alun Lawrence.

Wayne Evans
Former Dragons scrum-half on BBC Radio Cymru

Dragons need to manage the ball well now. As we saw earlier, Cardiff have exciting players such as Cameron Winnett that can cause danger.

Wayne Evans
Former Dragons scrum-half on BBC Radio Cymru

O'Brien normally gets those kicks and he's missed two now.

Filo Tiatia will be very frustrated.

It's another poor miss in front of the posts by Angus O'Brien.

You wonder if Lloyd Evans might take over kicking duties?

Both sides have been forced into some early changes.

Corey Domachowski is on in Cardiff's front row in place of Ed Byrne, and Harry Wilson replaces Joe Westwood in Dragons' midfield.

James Hook
Former Wales fly-half on BBC Radio Wales

I think the Dragons will be happy so far.

It looks like a tactic to try and challenge the set piece of Cardiff.

A moment of class from Cameron Winnett.

What a young talent he is.

He sets up to kick, steps Angus O'Brien, but the final ball doesn't quite stick.