Highlights on BBC Two at 23:15 BST
Root & Morgan hit unbeaten half-centuries to steer England to victory
Five wickets for Sam Curran (three with new ball) & four for Willey
Dhananjaya's 91 off as many balls rescues Sri Lanka
Sri Lanka fall to 21-4 inside first seven overs
England won toss; second of three ODIs, The Oval
England lead three-match series 2-0
James Anderson
England bowler on BBC Test Match Special
England are employing Brendon McCullum-like fields to the left-handers. It's very attacking, and something you don't always see in one-day cricket, but England can afford to be attacking at 21-3.
"Very nice junior, four down now" growls Jonny Bairstow behind the stumps as Sam Curran steams in. His second ball clips the shoulder of Charith Asalanka's bat but it doesn't carry to the cordon.
James Anderson
England bowler on BBC Test Match Special
The fans not in the ground need to hurry up at this rate!
Matthew Henry
BBC Sport at The Oval
I can confirm there are still people queuing outside the ground. They really need to get a shift on.
It's certainly been ruthless so far, Martin. David Willey raps Dhananjaya de Silva high on the pads with the third ball of the over and his appeal his vociferous. However, the umpires aren't interested. De Silva responds by biffing Willey back over the top for four - a confident shot given the situation.
#bbccricket
Martin Davies: Got to question the decision to bowl first against such weak opposition. Would be pretty disappointed if I was a ticket holder, could be over in a couple of hours!
Image source, Reuters#bbccricket
Rhys Humm: Crikey, even our Test team could beat this Sri Lankan lot...
Simon Mann
BBC Test Match Special
Sri Lanka are in tatters here.
James Anderson
England bowler on BBC Test Match Special
It's good bowling but the shot selection is poor. It's a rebuilding job for Sri Lanka now who need to get those this tricky period.
Nissanka b S Curran 5 (SL 12-3)
That shot was not so exquisite from the Sri Lanka opener as Sam Curran snaffles his third wicket. The left-armer with a textbook dismissal, swinging the ball into the right-hander and Nissanka played it too early and the ball clatters into his stumps.
Here's that cover drive which James Anderson described as "exquisite".
New man Dhananjaya de Silva gets himself off the mark by clipping David Willey through mid-wicket. It's a rebuilding job for the next few overs for the tourists.
Matthew Henry
BBC Sport at The Oval
Overheard near an entrance at The Oval: “I think we’ve missed a wicket already.”
I didn't tell them...
Image source, ReutersJames Anderson
England bowler on BBC Test Match Special
No!
Simon Mann
BBC Test Match Special
Do you remember that Jimmy?
Andy Zaltzman
Test Match Special statistician
Sam Curran is the first England bowler to take two wickets in his opening over in a one-day international since James Anderson against New Zealand at Lord's in May 2013.
A Fernando lbw b S Curran 2 (SL 6-2)
It was plumb in front. Fernando burns a review after getting himself in a tangle trying to work a swinging delivery from Sam Curran into the leg side. Sri Lanka 6-2 and all sorts of trouble.
It's all happening. Another review as Sam Curran hits Avishka Fernando. This looks plumb.
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James Anderson
England bowler on BBC Test Match Special
Good bowling from Sam Curran. He usually swings the ball away from the bat with the new ball but he nipped that one back in and it's a great wicket for England.