Besides Maxwell's swashbuckling 53-ball 102, which was the second fastest World Cup hundred, the Australian scorecard was studded with three fluent half-centuries in a formidable middle-order batting performance.
Maxwell got to the three-figure mark in just 51 balls, just one short of the World Cup record held by Ireland's Kevin O'Brien.
Skipper Michael Clarke (68), Steve Smith (72) and Shane Watson (67) showed rampaging form during the course of their fifties as Australia sent the Lankans on a leather hunt in front of a packed house.
The Aussies, left rattled by a one-wicket loss to New Zealand in their previous match, came out all guns blazing today and even though explosive opener David Warner (9) was out early, the hosts simply decimated the Lankan bowling.
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The assault started with Clarke and Smith combining for a 134-run third-wicket stand during which the skipper's confident demeanour put to rest any speculation regarding his fitness after a hamstring surgery, which had created doubts about his participation in the World Cup.
This was followed by a brutal assault by Maxwell, during which the imposing all-rounder whacked 10 fours and four sixes, completely taking the wind out Sri Lanka's sail.
The ferocity and disdain with which he hit the islanders all over the park had the packed stadium on its feet even as the Lankans scurried for cover.
He shared a 160-run fifth-wicket stand with fellow all-rounder Watson, who roared back to form after a prolonged wretched run with the bat, striking seven fours and a couple of sixes in a 41-ball effort.