Harri Deaves tries to dive for the line but is held up by a few red shirts. Great Ulster defence again but, perhaps, the hosts should have gone through more phases there.

Nathan Doak is pinged for offside and, instead of going for the game-tying kick at goal, Jack Walsh goes to the corner.

Ulster clear their lines and play is at halfway. Meanwhile, Angus Bell is on for Eric O'Sullivan to try to steady the scrum.

Keelan Giles wins an aerial battle over Michael Lowry and Jack Walsh goes to the air again and, although Zac Ward claimed this one above Daniel Kasende, he is bundled into touch and it is an Ospreys thrown on the 22.

Ceri Coleman-Phillips
BBC Sport Wales at the Brewery Field

Ospreys head coach Mark Jones plays his replacement cards early.

He brings on Wales scrum-half Reuben Morgan-Williams and Wales flanker Harry Deaves, while Tom Botha will look to bolster the set piece.

Yet another Ospreys scrum penalty. They have been utterly dominant at the set piece. Can they go a step further and turn it into points?

Great handling from Werner Kok and James Hume get Ulster into the home 22 but Michael Lowry can't keep it going and spills forward.

Jack Walsh launches a clearance kick almost to halfway and Ulster knock on again at the lineout. Scrum down Ospreys.

Back underway as Jack Murphy gets us going.

Ceri Coleman-Phillips
BBC Sport Wales at Brewery Field

It's a great contest here in Bridgend.

Ospreys started and finished the half brightly, while Ulster were overall the better side and head down the tunnel worthy of their three point lead.

All to play for after the break.

Another cross-field kick attempted but this one is knocked on by Werner Kok that brings us to half-time.

Both sides had possession and territory but the visitors hold a slender lead.

A penalty only from Filippo Russo and Jack Murphy puts it close to the home line.

Big chance right on the stroke of half-time for Ulster.

The TMO is looking at a head-on-head collision here between Cormac Foley and Tom Stewart right on the half-time hooter.

More big Ulster defence! Tom Stewart gets over the ball and Kieran Williams is pinged for holding on.

Another penalty conceded this time at the line-out from Ulster and the Ospreys are up to within five metres of the lines.

Walsh is straight back into the action and puts a penalty up to the Ulster 22.

Ceri Coleman-Phillips
BBC Sport Wales at the Brewery Field

Ospreys fly-half Jack Walsh has passed his head injury assessment and is back on the field.

A bit scrappy from the Ospreys but some good line breaks from Owen Watkin and Daniel Kasende get them into the Ulster 22.

Michael Lowry does well to field Luke Scully's grubber through and Ulster clear all the way to halfway thanks to a booming Nathan Doak boot.

Good defence from Ulster forcing the kick through.

A bit of kick tennis ends in a spillage into touch from Ospreys full back Iestyn Hopkins. Perhaps unsurprisingly, Ulster go to the lineout instead of the scrum.

However, Ospreys win a scrum off the set-piece and will look to dominate again.

Another scrum penalty for the hosts. Jack Walsh is off for an HIA so Luke Scully puts the kick up to halfway.

Werner Kok competes with Keelan Giles for a high box kick from Nathan Doak but spills it forward.

Scrum down Ospreys just outside their own 22. They have the better of Ulster at scrum time so far.