Kick-off: 15:00 BST
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Leinster on 25-match winning run
Winners to face either Clermont Auvergne or Racing 92 in the last four.
Leinster 3-22 Saracens
Leinster with channel one ball out the back of the scrum - they don't want to keep the front row in that hurt locker any longer than they need.
Quick ball and Johnny Sexton finds a hole on the blind side.
Saracens offside inside their own 22m as they scramble.
Huge pressure on the visitors...
Leinster 3-22 Saracens
Leinster are already ringing the changes.
Ronan Kelleher replaces Sean Cronin at hooker while Ryan Baird is also introduced to the action.
Leinster 3-22 Saracens
The Saracens ground game bites back.
Maro Itoje cannily lurks around the fringe of the tackle and then plunges over the top of the grounded Cian Healy to milk the penalty.
Leinster don't look like they have got a grip of the referee's interpretation.
Itoje is speaking fluent officialese.
Leinster 3-22 Saracens
Right, here we go.
And Leinster start with intent!
Sean Maitland is penalised for escorting a chasing Leinster play away from catcher Duncan Taylor.
Penalty blue. And Leinster kick into the Sarries' 22.
They need points fast.
HT: Leinster 3-22 Saracens
Leinster-Saracens
Possession: 55%-45%
Territory: 60%-40%
Metres made: 66-47
Defenders beaten: 6-1
Turnovers conceded: 9-3
Tackles made/attempted: 59/40 - 55/61
Penalties conceded: 8-5
Image source, Getty ImagesHT: Leinster 3-22 Saracens
Paul Grayson
Former England fly-half on BBC Radio 5 Live Sports Extra
We said before the game when would the Leinster run of excellence dip? Sometimes it happens in a game like this, and Saracens are at 100% efficiency. They are not out of it but they are under enormous pressure.
Leinster 3-22 Saracens
Oranges.
Leinster 3-22 Saracens
Not this time. Daly's penalty drops just short, but his team are head down the tunnel with more spring in their step than Zebedee.
Leinster need the full napalm team-talk from Lancaster and Cullen to shock them into life.
Leinster 3-22 Saracens
The clock in the red, but there is still time for another Saracens penalty after a scrum infringement.
Elliot Daly is going to give it a bash from fully 60m...
Leinster 3-22 Saracens
Paul Grayson
Former England fly-half on BBC Radio 5 Live
I cannot tell you how good that was from Saracens. It's just a text book three-phase play straight off the training field.
It goes out the back to Alex Goode, who hits Duncan Taylor short, then follows him in for the offload. Magnificent.
Alex Goode (con Goode)
What a try!
Something off the training ground mixed with something from the gut instinct of Duncan Taylor.
A intricate wraparound looks like it is gong to die in contact before Taylor flips an offload off his shoulder to Alex Goode who throws a shake-and-bake dummy and scampers in.
Extras as well from Goode for an unreal scoreline.
Image source, Getty ImagesLeinster 3-15 Saracens
Saracens are winning all the battles as well as the scoreboard war.
Maro Itoje takes the line-out cleanly despite Devin Toner's pressure. Their driven maul makes a quick, easy 15m. And Leinster are in at the side to give away another penalty...
Leinster 3-15 Saracens
Saracens with the put-in, five out from the own line...
Under pressure, but illegal pressure decides the referee!
Cian Healy is penalised for wheeling it.
Leinster's long visit to the 22m is going to end without points on the board.
Leinster 3-15 Saracens
Saracens turnover!
Vincent Koch and Billy Vunipola keep an isolated ball carrier off the floor as Leinster attempt to rev up a driving maul.
The referee initially signalled for a Leinster scrum but realised that the ball was off the deck and switched his signal the other way.
Maro Itoje smiles and puffs his cheeks in mock relief.
Leinster 3-15 Saracens
Johnny Sexton opts to kick a presentable penalty shot for the corner. The wind is against him, but is he already turning down the easy points for a bigger risk and reward?
A rolling maul is brought down by Michael Rhodes. To the corner once more.
Another Saracens infringement, another penalty and Sarries captain Brad Barritt is getting a talking to.
His team are straying close to a penalty try...
Leinster 3-15 Saracens
Paul Grayson
Former England fly-half on BBC Radio 5 Live Sports Extra
Leinster need to wake up and they need some points on the board. They won't be panicking yet but they certainly won't want Saracens to get any more points on the board before half time.
Elliot Daly
Two out of two from the long-range boot of Elliot Daly.
Saracens are 12 points clear. Leinster, even with less than 30 minutes gone, are staring down the barrel.
No room for error now for the hosts.
Leinster 3-12 Saracens
An early call but Leinster might be crumbling here.
Johnny Sexton chops the restart out on the full.
Saracens monster the Leinster scrum at the set-piece. Another penalty. Itoje and Swinson hollering and whooping in the boiler room.
And Elliot Daly is going to take on another shot...
Leinster 3-12 Saracens
Paul Grayson
Former England fly-half on BBC Radio 5 Live Sports Extra
What a shot that is. That was at 52 metres and Elliot Daly was not even at his limit. I've seen him warming up at Twickenham and knocking them over from 60/65 metres.
Elliot Daly
It flies and flies like a John Daly drive.
It's good!