The Australians will be overly confident after their 4-0 demolition job in the recently completed Ashes.
While his stroke play, especially early on, was the most eye-catching element of his record-breaking knock, the savvy and maturity he showed to rein it in during the middle of the innings was perhaps the most telling in judging Roy's development.
"[His innings against Australia] is on the back of a tough summer but he finished it incredibly well", Morgan said.
Limited-overs skipper said: "Joe is good and should be fit to play tomorrow". "Incredibly special, I don't have too many words right now".
"And if the lads aren't prepared to get on board with that, then we've got to go with something different. He said he'll be fine so I don't think there'll be any trouble there". "What a way to start the series - still a long way to go, but certainly a great start".
Those qualities are not the only pre-requisites for success in Test cricket, of course, but Bayliss - along with assistant coach Paul Farbrace and captain Eoin Morgan - have turned England into a formidable white-ball unit.
Hales has only just returned to the set-up having been with Stokes in Bristol four months ago, marking his comeback with a quickfire 52 in Thursday's warm-up win in Sydney. It sums up the character of the bloke, coming back in.
It was Australia's eighth loss from their last nine completed One-Day Internationals (ODI) heightening growing concern over their spiralling 50-over performances. More importantly, England needed only 17 more runs to win. I think cricket tests you and you start questioning yourself and start questioning your preparation and how you're playing the ball and all this sort of rubbish, and it was just a case of clearing my head. Australia 199 for 4 after 36 overs.
Australia's Aaron Finch also took his place among the game's supporting acts, though his diligent 107 looked more important at the time. "It's by no stretch of the imagination impossible for us".
Legspinner Zampa (0-72) bore the brunt of the damage with Roy hitting three sixes off his bowling, but Starc (2-71), Cummins (2-63) and debutant Andrew Tye (0-43) had few answers either.
Jason Roy of England leaves the field. The doctor was with me for most of that period and he chose to get us to the hospital and see what they could do about it.
England made light work of polishing off their target of 305, cruising home by five wickets with seven balls to spare despite a late flurry of three wickets for 21 runs.
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