Mann returns to the action and is almost straight over the try line.

A Cardiff lineout move sees Mann peel off but Dewi Lake gets his big body under the flanker to deny him his hat-trick.

Taulupe Faletau may have got away with a yellow card in the build-up to that try.

He was out-foxed by Reuben Morgan-Williams' reverse pass and totally cleaned out the scrum-half without the ball.

Richie Rees
Former Wales international on BBC One Wales

Cardiff players have the most tackles in the league by a country mile, but that takes its toll in the last 20 minutes of games.

We’re at a 10-point game with 20 minutes to go, anything could happen.

Sean Holley
Former Ospreys head coach on BBC One Wales

Now we’ve got a game on our hands.

We said it was all about who scores next, Ospreys are back and now they’ve got a chance.

Huge hits by Cardiff keep Ospreys out.

James Ratti found a gap and then Keiran Williams in support.

But Teddy Williams hauled down the centre, then Josh Adams and Cam Winnett combine to stop Keelan Giles scoring what looked a certain score.

And then Rhys Litterick and James Botham hold up Evardi Boshoff over the line.

Incredible commitment from Cardiff to protect this lead.

A big win for the Cardiff pack as they stop the Ospreys driving lineout before it really ever got going.

Pats on the backs all round.

There have already been 24 penalties in this derby and we're not even three-quarters of the way through.

Both sides have to clean up their act.

Sean Holley
Former Ospreys head coach on BBC One Wales

The next score is crucial for this game. If Cardiff score they run away with the game, if it’s the Ospreys that’s where it starts getting tetchy.

Will Spencer replaces flanker Tristan Davies in a third change to the Ospreys pack.

Cardiff's Rhys Litterick is on for Assiratti.

Richie Rees
Former Wales international on BBC One Wales

Three times Alex Mann hasn’t used his arms in contact, he needs to use his arms more or he’s going to get into trouble.

That was the time for a yellow card.

Well he has had an eventful game!

Two tries, then concedes a penalty that rules out a score and now he's heading to the sin bin.

Mann hits Reuben Morgan-Williams late with the shoulder after the scrum-half kicked.

Late? No arms? Take your pick - but it was stupid.

Mark Jones makes his first changes with hooker Dewi Lake and prop Garyn Phillips on for Parry and Thomas.

To be fair, the set-piece had actually improved for Ospreys in the opening minutes of this second half.

Evardi Boshoff knocks on and another Ospreys opportunity goes begging. Sums up their game so far.

Morgan Morse is back from the sin bin so Ospreys back to full strength and inside Cardiff's 22-metre area.

You get the feeling they really need to score here.

Got to say, it does look a little like a schoolboy telling off a teacher when baby-faced 21-year-old referee Ben Connor has a word with Liam Belcher.

Richie Rees
Former Wales international on BBC One Wales

The Ospreys need to try and steal a number from somewhere.

It’s been far too easy for Cardiff to defend today.

Wow. Jac Morgan got hit by two players then but just bounced off them and went again.

I'm not sure what Ospreys were trying then but it just never really looked like working.

The forwards won their lineout, Edwards spins the ball wide to Walsh who tries some sort of banana kick off the outside of his boot and it bobbles into touch.

Ospreys have struggled in attack today.

There's a break in play while Cam Winnett receives treatment after coming down awkwardly from challenging Keelan Giles for a high ball.

The dangers of life as a full-back.