Leinster v Ulster (17:45 GMT)
Leinster 5-10 Ulster
Sean Cronin shows what he is all about. The Leinster hooker crashes on an inside line past Ulster number eight Marcell Coetzee. Iain Henderson gives away a penalty as he tries to make amends.
Penalty. And Leinster opt for the kick to the corner...
John Cooney
Over it goes!
John Cooney connects cleanly and splits the sticks from distance.
Leinster 5-7 Ulster
Jacob Stockdale with a superb leap, snatch and steal as he contests an aerial ball with Adam Bryne.
Ulster on the front foot. And Cian Healy mindlessly drives into the side of a ruck to give away a penalty.
John Cooney points to the sticks...
Leinster 5-7 Ulster
Ross Byrne takes on a lengthy penalty shot after Ulster centre Darren Cave is a little over-eager to get up in the face of his opposite number.
But Byrne has pulled it as he strains for extra power...
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Leinster 5-7 Ulster
Rory Best has been beaten by that ankle knock. On comes Rob Herring in the Ulster front row.
Iain Henderson is the new skipper for the visitors.
Leinster 5-7 Ulster
Tony Ward
Former Ireland fly-half on BBC Radio Ulster
In all my years coming here, I cannot recall a more atmospheric 15 minutes. The rugby is right up there in terms of intensity and physicality with international rugby.
Leinster 5-7 Ulster
Budge Pountney
Former Scotland flanker on BBC Radio Ulster
We've seen some awesome match-ups in the forwards so far. There are turnovers all over the place, Cian Healy has made two already.
The ball retention from Leinster has been absolutely superb.
Leinster 5-7 Ulster
Cian Murtagh
BBC Sport NI at Dublin's Aviva Stadium
Phew! An unbelievable start by Ulster, who look really up for this. I can hear some of their tackles from the top tier at the Aviva Stadium.
As you would expect, Ross Byrne is being put under all sorts of pressure and it was his loose pass that forced Garry Ringrose to cut back against the grain before his kick was blocked down.
But what a fantastic response by the Leinster fly-half - that should settle the nerves.
Leinster 5-7 Ulster
Rory Best is racking up some miles of medical tape as the physios sort out an ankle problem.
The Ulster hooker is good to go after drying his bald pate with a towel and strapping the scrum hat back on his head.
Leinster 5-7 Ulster
A sobering moment for Jordi Murphy as the Ulster flanker is ushered into touch by his former team-mates after hanging wide for a big charge at the blue wall.
Ross Bryne
It is the fly-half who finally picks the lock after the forwards have failed to quite blow the doors off some stubborn Ulster defence.
Ross Bryne takes a lovely drifting line, hints at a pass to Rory O'Loughlin and instead dives and reaches over to dot down despite the attentions of Robert Baloucoune.
Bryne is off target with the extras though.
Leinster 0-7 Ulster
Rhys Ruddock smashes up to within two metres on the 20th phase...
Leinster 0-7 Ulster
Leinster are back on the front foot in search of a response. Scott Fardy burrows up to within 10 metres of the Ulster line...
Kieran Treadwell (con Cooney)
And it is exactly what they deserve!
Ross Bryne crabs sideways as he searches for space for his clearing kick. Instead the Leinster fly-half finds the noose tightening with every step.
His kick is charged down and Kieran Treadwell is on hand to gather in the bobbling ball and slide over.
Conversion from John Cooney is good.
Leinster 0-0 Ulster
Tony Ward
Former Ireland fly-half on BBC Radio Ulster
It's been a very physical start. Both sides are attacking the breakdown. Ulster have obviously come with the ambition to meet Leinster physically.
Leinster 0-0 Ulster
Ulster break blind!
And feed Jacob Stockdale!
The Ulster and Ireland express train is just about diverted into the sideline sidings by Leinster's cover defence.
Leinster 0-0 Ulster
Ulster have started the better.
Cian Healy gives away the scrum on Leinster's 22m...
Leinster 0-0 Ulster
Billy Burns hoists the high one for Ulster..the chase is good, but Jordan Larmour claims the mark for Leinster under pressure from Iain Henderson.
Leinster 0-0 Ulster
A massive counter-ruck from Ulster as their forwards piles into a breakdown.
Battering runs from Stuart McCloskey and Marcell Coetzee.
The underdogs have started in rabid, raging fashion.