Andy Gray
BBC Sport NI at the Affidea Stadium

Ulster are good value for their lead and, bar one tap and go from Cardiff, have dominated proceedings.

The highlight was Angus Bell's superb score, though Scott Wilson has made a big impact at both ends.

Now, given their last two results against Cardiff when they have thrown away leads of 19 and 14 points, can they see this one out?

Image source, Getty Images

Indeed, he has.

A great 'no-look' pass from Che Hope has the winger diving for the corner, but Ross Moriarty does enough to force him out of play before the ball is grounded.

Rio Dyer is getting closer but still, no cigar.

Rhys Priestland
Wales international fly-half on S4C

That was a great try by Morgan-Williams and just what the Ospreys needed.

This should be the start to gain that momentum. You’re always going to get over the gain line with speed like that from your nine, as I said, it’s exactly what the Ospreys needed.

Has Rio Dyer been denied again?

Ulster have controlled proceedings in the first half with Cardiff looking rather blunt with the little ball they have had.

The hosts will possibly be hoping t control the ball a bit better but, ultimately, they will be much the happier of the two sides at the interval.

A great move from Dragons as David Richards comes off his wing to link with Angus O'Brien.

He sets Rio Dyer free on the left but Keelan Giles storms off the opposite flank and does just enough to force him into touch 20 metres out. Emphasis on just...

Chris Horsman
Former Wales prop on BBC Radio Wales

Ulster have controlled this first half. Good territory and possession to be ahead.

Zac Ward goes on another barnstorming run down the left but is well held by two Cardiff defenders and his attempted offload is spilled. Scrum down, blue ball on halfway.

That has got them going again.

After turning defence into attack Ospreys get a penalty and this time, Jack Welsh safely finds his touch.

An attacking lineout, and a chance...

Filo Tiatia will be pleased with his side so far but that will frustrate him.

A lineout drive sets up the platform for another assault on the line but scrum-half Che Hope rushes his pick up and knocks on.

Oh hello, a huge Ospreys scrum follows but they play the advantage and Iestyn Hopkins breaks out of his own 22...

Zac Ward takes a high ball and puts his head down and goes straight for the Cardiff defence. Scrum half Johan Mulder is his unfortunate target and the Ulster wing uses him as a speed bump.

You have to feel for a scrum half being caught in the wild with such a dynamic runner as Ward baring down on him but he slowed him down if nothing else!

Rhys Priestland
Wales international fly-half on S4C

The Dragons are controlling the kicking game. The Ospreys need to find a way to get into this game and get some control.

The Dragons are winning the physical exchanges at the moment.

Another big carry from Harri Keddie draws a penalty and Tinus de Beer kicks to within 10 metres.

The visitors are going for the jugular.

That spell of pressure comes to nothing as Ulster are pinged for holding on to the ball on the ground. Callum Sheedy gets the ball to the halfway line with the kick.

Another good boot from Jack Murphy and Ulster win the lineout in Cardiff's 22.

Careless from Jack Walsh.

This time Ospreys get the scrum penalty but he misses touch, and Angus O'Brien gratefully takes the loose kick and duly pumps his side back over halfway.

Iestyn Harries breaks forward as Ospreys look to respond, but he is hauled to the ground.

Hang on though, the officials are checking for a possible dangerous clear-out by away number eight Harri Keddie.

Nothing there, though. As you were.

The visitors do get over the line but they can't ground the ball. Tom O'Toole is the one getting the pats on the back as he gets up and Ulster clear to near the halfway line.

Rhys Priestland
Wales international fly-half on S4C

Some really strong carries by Dragons here, the momentum is all with them currently.

The Ospreys had no options as the visitors went wide and they got the rewards.