This latest defeat for England also breathed more life into closest challengers Bangladesh, Sri Lanka, and Pakistan, each of which must still win all their remaining games to remain hopeful.
The decision at the toss was vital. Eoin Morgan won it and made Australia bat first. Counterpart captain Aaron Finch was leaning toward bowling first, too, but wasn't fussed.
Morgan gambled on quicks Chris Woakes, Jofra Archer, and Mark Wood taking wickets in ideal conditions; overcast and muggy.
All three found movement off the seam in a rousing opening but the edges, air shots, and drops near fielders faded away as Finch and David Warner came out of their bunker and posted their third century stand of the tournament.
Finch and Warner have been out only once each in the first 10 overs, and still only once through seven matches. Finch was pulling too-short balls to the boundary and Warner, given three slips, soon scattered them as he hit boundaries off Archer, Woakes, and Wood.
Their fifth consecutive fifty partnership came in the 12th over, and the century partnership in the 18th.
Finch reached his 50 in the 19th and Warner his in the 20th.
They were serene until on 123 in the 23rd over Warner was taken aback by Moeen Ali and mistimed to backward point, where Joe Root juggled the catch. Warner made 53 off 61 balls.
Finch reached his 15th one-day international hundred, seventh against England, and second in this World Cup only to depart on the next ball. He hit 11 boundaries and two sixes and left his side sitting pretty at 185-3 in the 36th over.
But the charge didn't come. England fought back to take 5-74 — Smith was booed walking in and walking out on 38 — and Australia finished feeling short-changed.
Finch pulled out another ace card, however. He gave the new ball to Behrendorff, who was hammered by Sri Lanka in his only World Cup appearance but was picked for the conditions at Lord's and was brilliant.
He bowled James Vince on the second ball of the innings with an inswinger, and by the time Jonny Bairstow game him his second wicket, England was 53-4 and its low confidence was hurt again.
Starc had removed Joe Root on 8 and Morgan on 4.
Ben Stokes, as he did in the last game against Sri Lanka, resisted alone with 89 while suffering cramps in both calves, but, as in the last game against Sri Lanka, watched partners throw away their wickets. He was sixth man out to a Starc yorker in the 37th over, and England lasted only eight more overs.
England was still in the semifinal positions, but Australia rose to No. 1, with new tennis No. 1 Ash Barty watching from the packed stands.
England's remaining games:
India, Edgbaston, Sunday
New Zealand, Chester-le-Street, Wednesday
