Australia captain Aaron Finch and tempo bowler Mitchell Starc stole the present because the holders eased to an 87-run win over Sri Lanka on the Oval on Saturday.
Finch equalled his career-best one-day worldwide rating with a masterful 153 and Steve Smith chipped in with 73 as Australia scored 334-7.
Needing a World Cup report run-chase to assert a shock win, Sri Lanka obtained off to a flying begin due to a first-wicket partnership of 115 between captain Dimuth Karunaratne and Kusal Perera.
However Perera departed for 52 and when Karunaratne fell on 97 the sport swung again in Australia’s course.
Starc was the catalyst with a fiery spell of three wickets in six balls, Australia finally dismissing Sri Lanka for 247 thanks largely to his 4-55 from 10 overs.
Kane Williamson added three wickets of his personal as Australia made it 4 wins from their 5 group matches after beforehand beating Afghanistan, the West Indies and Pakistan.
Their lone defeat within the 10-team event got here in opposition to India and their newest victory places them nicely on target for a semi-final berth.
Sri Lanka, who misplaced their final seven wickets for 42 runs, have just one win from their 5 matches, a disappointing run that features two washouts.
They face a battle to succeed in the semi-finals with solely 4 matches left, a spell that options encounters with title contenders England and India.
Sri Lanka had briefly regarded able to surpassing the World Cup chase set by Eire, who made 329-7 to beat England in 2011.
Karunaratne and his opening associate Perera blasted 24 from the primary two overs and reached their fifty partnership in simply the seventh over.
However Starc bowled Perera and Jason Behrendorff dismissed Lahiru Thirimanne for 16 as Australia hit again.
– Starc turns the screw –
A six from Kusal Mendis within the 31st over signalled Sri Lanka’s intent to get cracking.
However crucially Karunaratne stumbled in need of his maiden World Cup century when he carelessly flicked Richardson to Glenn Maxwell at backward level.
That left Sri Lanka 186-Three and set the stage for Starc to show the screw by dismissing Milinda Siriwardana, Thisara Perera and Mendis in fast succession.
Mendis’s mistimed drive off Starc decreased Sri Lanka to 222-7 and shattered their resistance.
Earlier, Finch took the Sri Lanka assault aside with a stunning show that included 15 fours and 5 sixes.
He was well-supported by Smith’s 73 from 59 balls and the pair placed on 173 runs for the third wicket.
Along with opening associate David Warner, Finch took the assault to the Sri Lankans after being put in to bat below cloudy skies in south London.
The pair handed fifty for the opening wicket for the fourth time in 5 video games on the World Cup.
Sri Lanka had no reply to Finch’s brutal assault and by the point he departed, caught by Karunaratne off Isuru Udana, he had put Australia in a commanding place.
Maxwell’s quick-fire 46 from 25 balls rubbed salt into Sri Lanka’s wounds.