Jerome Taylor has taken a hat-trick to stun Australia and guide the West Indies to a 10 run victory in the Champions Trophy.
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Batting first, the West Indies put on 234-6 after some steady batting from its middle order.
However, the heavy favourites looked on track to cut down the total in no time as Adam Gilchrist (92) and Michael Clarke (47) put on a stand of 101.
Taylor, though, soon found his line and his hat-trick, which came after nabbing Mike Hussey, Brad Hogg and Brett Lee, put the West Indies back in control.
Australia will now square off against England in Jaipur later in the week, with the losers facing an early exit.
Earlier in the day, Brian Lara and Runako Morton were the leading lights of the Caribbean as they helped the West Indies to 234-6.
The pair came together in the 16th over after the loss of four early wickets, and the surprising decision of Lara to bat at No.6, to forge a well-timed 137-run partnership for the fifth wicket.
In contrast to his painstaking 31-ball duck in the DLF Cup final last month, Morton capitalised on being dropped on 41 to make an unbeaten 90 off 103 balls.
Lara, meanwhile, after a nervous opening, pounded two sixes in a 94-ball 71 before holing out to Andrew Symonds following a spell of treatment for a back strain.
Australia used seven bowlers in total with the wickets shared equally, although Nathan Bracken returned 2-42.
Both sides made adjustments to their usual line-ups with Australia having the better of the early exchanges as the West Indies tumbled to 4-64.
The experiment of promoting Wavell Hinds up the order in place of Shivnarine Chanderpaul, who was laid up with food poisoning, soon backfired when he fell to Bracken for one.
Dwayne Smith then executed two lovely cover drives to reach eight before dabbing a simple chance to Hogg at square leg, handing Lee his 250th one-day international wicket.
Some sharp captaincy from Ricky Ponting paid dividends when both Shane Watson and Clarke claimed wickets in their opening overs.
Chris Gayle (24 off 26 balls) had just edged Glenn McGrath through the vacant second slip region when, after facing only five more balls, he was caught behind off Watson.
Then another good bowling change saw Ramnaresh Sarwan (21 from 32 balls) trapped right in front playing back to a quicker one from Clarke.
But with the Windies on the ropes, Lara eventually joined Morton at the crease with the responsibility of saving his side from another batting embarrassment after its 80 all out against Sri Lanka.
They started watchfully against Australia's three-pronged spin attack with the 50-stand arriving in 86 balls.
The turning point came when Ponting dropped a tough chance after Morton had taken an unnecessarily wild swing at Bracken on 41 and with the score 4-129.
The fifth-wicket pair took that lifeline as a cue to take the fight to the Australian attack as Lara in particular sensed they could advance the score well past the 225 the captain had nominated as a decent total before the game.
Lara pulled a tiring Watson over the midwicket boundary off the front foot - the first six on the Mumbai ground in the tournament - on the way to the century stand, the West Indies' best-ever fifth-wicket partnership against Australia.
But with a hobbling Lara dismissed by McGrath, momentum stuttered despite Carlton Baugh's quickfire 13.
However, despite Australia's positive start, Taylor's scintillating spell with the ball was enough to cripple the world champions late in the match.
