Pool D FT: Ireland 50-7 Canada
O'Brien, Henderson, Sexton, D Kearney, Cronin, R Kearney, Payne tries
Van der Merwe scores Canada's try
France v Italy also in Pool D at 20:00 BST
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Ireland 36-7 Canada
When your side is being thumped, these stats from Canada winger DTH Van Der Merwe are pretty impressive: one try; 137 metres made; four defenders beaten; three clean breaks; two turnovers won; and six tackles.
Image source, AFP
Denis Hickie
Former Ireland winger on BBC Radio 5 live sports extra
"Van der Merve has really hassled the Irish defence today. It is no less than what Canada deserve from this game. I have been impressed by large parts of their game, they lack structure but their commitment has been excellent."
David Humphreys
Former Ireland fly-half on BBC Radio Ulster
"You have to give Canada credit for the way they have approached the second half. They still have energy and are working hard."
Ireland 36-7 Canada
There's no doubting that DTH van der Merwe has been Canada's best player here this afternoon - and it's hard to begrudge him a superbly taken try, grabbing a Jared Payne kick and then racing over in the corner from around 30 metres.
Nathan Hirayama converts, meaning Sean Cronin's try is immediately cancelled out.
Denis Hickie
Former Ireland winger on BBC Radio 5 live sports extra
"Cruel and clinical counter punch from Ireland, defend from their line and get up and score. I get the sense it could be the end of Canada, this is beyond them."
Image source, PAIreland 36-0 Canada
Ireland 36-0 Canada
And it leads to Ireland's fifth try! After the initial shove, replacement Sean Cronin is at the heart of a second Irish wave and forces his way over underneath the posts.
Ian Madigan's conversion is good, and Ireland are 36-0 ahead.
Image source, InphoSean Cronin scores Ireland's fifth try under the posts
Ian Madigan heads for touch then, and Ireland's rolling maul following the line-out is looking absolutely mighty here...
But it all amounts to nothing for the Canadians as Djustice Sears-Duru infringes on the floor.
It's certainly worth pointing out that Ireland have failed to trouble the scorers in the 25 minutes we've seen since the break, which is of full credit to Canada, ranked a lowly 18th in the world.
Image source, AFPFor a very brief moment Canada, on the attack now, think they may have scored as Jebb Sinclair crosses in the corner after Nathan Hirayama's little grubber - but he was miles in front of the fly-half so it won't count.
They were playing with an advantage, at least, so we'll come back for a Canada penalty anyway.
Chris Henry, meanwhile, replaces try-scorer Sean O'Brien in Ireland's back row.
You can't knock Canada's ambition, attempting to throw a quick line-out deep inside their own half and with green shirts everywhere. They win a penalty in the aftermath too, which is sent spiralling out of play on halfway.
Three more Irish substitutions to tell you about too, as Sean Cronin, Cian Healy and Nathan White are introduced.
A notable return for Healy, who hasn't played since Leinster’s Champions Cup semi-final defeat by Toulon in April because of injury.
Denis Hickie
Former Ireland winger on BBC Radio 5 live sports extra
"That was a try in the making, Canada were scrambling. Keith Earls took his eye of the ball at the last second. Canada breathe a sigh of relief and they are breathing heavily.
"Good substitution by Ireland. Johnny Sexton has been at the heart of everything, he has orchestrated the play and kicked well. Ian Madigan has a lot to prove and needs game time at 10."
Image source, Getty ImagesIt's almost the perfect introduction for Ian Madigan too, but his attempted cross-field kick drifts just beyond Keith Earls and out of play. Unlucky.
Ireland are up to the five-metre line again, trying to smash a way through that Canadian door. But Keith Earls wastes a terrific opportunity to spread the play wide, knocking on under no pressure whatsoever.
All the while, Ian Madigan replaced Johnny Sexton at fly-half. Sexton leaves the field to a rapturous reception.
Ireland 29-0 Canada
Canada couldn't make Paul O'Connell's absence count on the scoreboard but it did at least help to even things up in terms of possession and territory for the first 10 minutes of the half.
Image source, OptaIreland 29-0 Canada
Johnny Sexton's kicking from hand has been superb so far in this match, as he sends another beauty into the corner.
Ireland steal the line-out too but, with Paul O'Connell back on the field again, they are unable to find a way over in the corner through hooker Rory Best.
Denis Hickie
Former Ireland winger on BBC Radio 5 live sports extra
"What Ireland were trying to do is wear Canada down but with Paul O'Connell coming back you on might see a change in tactics from Ireland."
Former Saracens wing DTH van der Merwe has certainly caught the eye for Canada this afternoon, this time beating the tackle of Conor Murray to make some metres over halfway.
But he runs out of room on the far side of the field, handing Ireland a line-out and an opportunity to build something of their own.
Image source, Getty ImagesIreland 29-0 Canada
Ireland's cruise in this opening game is built on doing the basics well, with all five scrums and all five line-outs won. It doesn't look flashy but you know coach Joe Schmidt is delighted with this set-piece solidity.
Image source, OptaYou can listen livehere.