The Windies set the hosts a miserly total of 71 runs, their third-lowest score in ODI history, which Australia chased down just one wicket done.
The small target still gave Australian newbie Glenn Maxwell time to smash a half-century from 34 balls, with the other runs scored by his opening partner Aaron Finch and Usman Khawaja, a late-minute replacement for David Warner.
The West Indies broke the record of the lowest ever total in 69 ODIs at the WACA, beating the 91 scored by Australia in 1987.
After the Windies won the toss and chose to bat, the day belonged to Mitchell Starc, who was bowling hoops coming into the Windies right-hander at well over 140kmh that they simply couldn’t handle.
Starc finished with five wickets for 20 runs, while Clint McKay was characteristically tight and took three wickets for 10 runs after striking first with the vital wicket of Chris Gayle.
With skipper Michael Clarke setting an attacking field more suited to snagging the final wickets of a Test match, the Windies dropped like flies.
Debutant quick James Faulkner took his chance and claimed his first two wickets in international cricket, both edges to Clarke at first slip.
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