Having scored 83-1 from 16 overs, Australia only needed to play for four more overs to be eligible to win via the Duckworth-Lewis rule for rain-affected games.
Whether it's with Ronchi or Tom Latham - still working his way back from a foot injury - makes little difference to Guptill's approach, which he said had become a little more aggressive since Brendon McCullum's retirement. That hard work will have persuaded them the score was a decent one.
England is now topping Group A with two points in their kitty.
With Woakes unavailable and Stokes struggling to bowl at full pace because of a problematic knee, Finn can expect to be selected for Tuesday's match against New Zealand with England looking to record a second straight victory in the tournament.
They have two points from two games in the Champions Trophy, the same number of points they would have had, had neither of their games had been rained off.
England could not have hoped for a better start to the tournament as it thrashed a lacklustre Bangladesh.
Jason Roy's lack of form is a problem for England.
The match between Australia and Bangladesh in the International Cricket Council Champions Trophy has been abandoned due to rain.More news: Guterres calls for two-state solution for Israel, Palestine
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Imrul Kayes (six) soon slapped Pat Cummins' wide delivery into the hands of Aaron Finch before the potentially destructive Mushfiqur Rahim was pinned lbw by Moises Henriques on nine.
However, there is a rain prediction and drizzle might play spoilsport here too. The umpires finally called off the match at 9:15pm local time (0145 hrs IST). He is now joint-third fastest overall with Indian captain Virat Kohli.
Only South Africa's Hashim Amla and West Indies legend Viv Richards hit that milestone quicker than Warner's 93 innings.
He looked nervous against Bangladesh and was not fluent early here.
Starc was the pick of the Australian attack after taking four for 29 before Warner passed 4,000 one-day worldwide runs in his 93rd innings, the fastest Australian to do so.
His 95 was an innings of staccato bursts, an insurgent operation of rat-a-tat salvoes against an overwhelming opponent, and it was no surprise that his dismissal brought about an abrupt finish, the last four wickets falling for one run in 15 balls.
Clouds hover over The Oval during the clash between Australia and Bangladesh.
Bangladesh had elected to bat but their display failed to justify Mashrafe Mortaza's decision as only Shakib Al Hasan (29) and Mehedi Hasan Miraz (14) joined Tamim in making any contribution of note. England lost three wickets quickly towards the end to end at 310-all out, with Buttler not out on 61.
Seamers Josh Hazlewood, Pat Cummins and Moises Henriques all picked up wickets inside the first 17 overs to put Bangladesh on 53-3.