Ashton also limping off, Commins steps in for the Saints.
Leinster look to have the game under control. Another change for Northampton as Day is replaced by Sorensen, while Sexton comes off to an ovation for Leinster. Madigan on in his place.
McFadden on, D'Arcy off for Leinster.
Northampton ring the changes - four men on - Waller for Tonaga'uiha, Mercey for Mujati, Geraghty for Myler...
Another difficult kick dispatched with aplomb by Sexton - he used the wind to just guide it home. The fly-half hasn't missed a trick for Leinster.
TRY FOR LEINSTER! Hines drives the ball over - his fourth try in the Heineken Cup is the one which has surely put this contest beyond Northampton.
Northampton change - Easter on for Wilson.
Van der Merwe for Healy in a Leinster change.
Another successful kick for Sexton - another nail in Northampton's coffin. What a passage of play from Leinster.
If they do win, then this is a significant moment - Sexton drills the ball straight and true through the posts, and for the first time in this match, Leinster are ahead.
Leinster win a penalty at scrum time! Would you believe it? They've been destroyed repeatedly in the first forty minutes - and yet they roar back! The way the forwards slap each other on the back it's as if they think the game is won.
A simple conversion, and over it goes! Leinster just two points adrift now - and Sexton has scored all 20 of Leinster's points.
TRY! Leinster get their reward! Sexton again is the finisher, and this one is right under the posts. The pressure tells as Clark cannot contain the Ireland fly-half.
But IT'S NOT A TRY! There's no conclusive angle, and that's another huge moment in this contest. Scrum on five metres - can Northampton retain their dominance at scrum time?
Cute angle for Sexton - he hits the post as well! But this time the bounce off the post breaks Leinster's way and it's two more points - surely this tie won't be settled by the difference of those two kicks hitting the post?
O'DRISCOLL BREAKS THE LINE! So close to the try - he finds Heaslip, but the number eight is also held up... Leinster swarming, throwing it all forward... the ball spins right, and SEXTON IS THERE TO SCORE!
It's all for Leinster to do - they've made a change - Jennings on for McLaughlin.
The second half begins!
TRY! High fives, cheers, and green and yellow flags waving across half of the Millennium Stadium. It's the captain Hartley who finally drove the ball over the line.
CLARK CLOSE FOR SAINTS! He just bounces off the Leinster men and refuses to go down - he can't get over the line but Northampton spin the ball right...
Ball lost forward for Northampton there - Mujati (and Clark) make their way back on to the field for the Saints. A terrific ten minutes from Mercey.
Good composure from Sexton - just when his side needed an icy cool kick, the fly-half delivers. The deficit reduced to 11 points. Despite Northampton's brilliance Leinster have the tools to get back into the contest in the second half.
Myler adds the conversion - 17-3 to the side who came into the game as underdogs!
FODEN THROUGH! Magnficent try - started by Myler, and finished by Foden who backs himself and skips through O'Driscoll's tackle to score Northampton's second!
Errors just letting Leinster down in the final moments here. They have a scrum and that means Northampton have to rearrange - Clark off, Mercey on for the Saints.
GREAT TACKLE FROM FODEN ON O'DRISCOLL! The full-back saves a certain try after Leinster cut the Saints' defence apart - but O'Driscoll realises he cannot get there on his own and as he looks for an offload Foden bundles him down.
Myler turns away immediately after he kicks this, confident he's put it through the posts. It takes the judges a moment to decide, but sure enough it is over. Northampton back into a seven-point lead.
Good penalty, straight through the posts. It gets Leinster back to within four of the Saints.
Myler knocks over the conversion! That's a confident kick from the left touchline and has given this final just the start it needed. All on Leinster now to respond.
TRY FOR NORTHAMPTON! This time they make it count - a powerful scrum on the edge of the 22, they spin left and Dowson gets in at the corner to break the deadlock!
We begin! Myler kicks off for Northampton.
NORTHAMPTON SAINTS: B Foden; C Ashton, J Clarke, J Downey, P Diggin; S Myler, L Dickson; S Tonga'uiha, D Hartley [capt], B Mujati, C Lawes, C Day, C Clark, P Dowson, R Wilson Replacements: B Sharman, A Waller, T Mercey, M Sorenson, M Easter, S Commins, S Geraghty, J Ansbro
LEINSTER: I Nacewa; S Horgan, B O'Driscoll, G D'Arcy, L Fitzgerald; J Sexton, E Reddan; C Healy, R Strauss, M Ross, L Cullen [capt], N Hines, K McLaughlin, S O'Brien, J Heaslip Replacements: J Harris-Wright, H Van Der Merwe, S Wright, D Toner, S Jennings, I Boss, I Madigan, F McFadden.
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