Hales 133* (110), Roy 112* (95)
England's highest ODI opening stand
England win with 15.5 overs to spare
Biggest ODI chase to win by 10 wkts
England lead 1-0 in five-match series
Brilliant. Just brilliant. Hales celebrates reaching his ton with three successive sixes. One over midwicket and two to cow corner. 27 off the over. And England now have a new record opening stand in ODIs. Bask in this people.
Eng 191-0
Well played Alex Hales son! Successive fours off Prasanna brings up his three figures. That is his third in ODIs.
Andy Zaltzman
Comedian & BBC Test Match Special statistician
"This is the first time both England openers have hit two sixes in an ODI."
Gunathilaka continues but Roy shows him contempt by dancing down to smash him past mid-off for four. England's record opening stand for the first wicket in ODIs is 200.
There is liquid confidence pumping through the veins of these two now. Hales absolutely smashes Prasanna into the second tier to move into the 90s.
Need further evidence that the England openers are on fire? Watch this...
Yep, the bananas have had plenty. They are currently sprinting round the stands, pursued by a gorilla. And a stormtrooper. These aren't the bananas you're looking for. Danuskha Gunathilaka is thrown into the attack by Mathews but his first over of off spin goes for seven.
Graeme Swann
Ex-England spinner on BBC Test Match Special
"Hales and Roy have gone through the gears nicely. They started off very circumspectly. They rain their singles and now they're plundering the Sri Lanka attack. They're answering the questions from the other night when the top order failed."
This is not Sri Lanka's day. Hales top edges Prasanna from an attempted sweep but the ball loops over Chandimal and lands safe.
Andy Zaltzman
Comedian & BBC Test Match Special statistician
"The last 50 came off just 35 balls."
Roy is getting fancy now. A glorious reverse sweep sends Randiv's delivery off to the boundary for four. Next ball? Oh, just a six straight down the ground. Cue Freed From Desire by Gala on the tannoy. It's the song of the summer... again.
tms@bbc.co.uk
My English teacher for GCSE English was Tim Curtis, and Phil Newport taught geography at our school... The cricket coaching wasn't too shabby either.
Patrick, Worcester
Image source, Getty ImagesThe onslaught continues as Hales drives Maharoof for four. All in the timing. Roy then gets a bit lucky with a sliced drive that sends the ball spinning into space just short of third man.
Here is how Roy reached his half-century...
Quality from Roy. He rocks back and waits for Prasanna's first ball before crunching a cut for four. 123 runs needed off 28 overs. Should be straightforward.
#bbccricket
Mike Bell: Deeply frustrating. England get to over 100 without loss. What can we moan about on live text when all going so well? I give up.
Pradeep is trying everything. Short, full, outside off, straight. All to zero impact. Hales lofts another just short of the rope for four. A yorker cracks Hales painfully on the boot but that just makes him angry and results in another straight blow, this time for six. These two are seeing it like Frank Sidebottom's head.
tms@bbc.co.uk
In 2005 during the famous Ashes, I had the misfortune of being in Philadelphia, USA. Here a local assured me that a mullet is defined as 'Business at the front, party at the back'.
Jim Holland in Keighley
Still no breakthrough for Sri Lanka. Five bowlers used in rotation but all of them have been tamed by Hales and Roy.
Here is how Alex Hales reached his fifty...
Eng 107-0
A push down the pitch off Prasanna and Roy joins Hales with a half-century. Push on now lads.
Take that Nuwan. Jason Roy sniffs a poor length, takes a stride and hammers the ball over long on for four. Angelo Mathews looks to the floor. How he wishes he could bring himself on.