The jaded Australians had already clinched the series by sweeping the opening four games, but Brian Lara's team looked more like the victors before a celebrating home crowd.

Wavell Hinds was again the tormentor with his second consecutive century to lead the West Indies to a comprehensive victory with six and a half overs to spare.

Hinds, who was not part of the original one-day squad, scored an unbeaten 103 off 130 balls to finish the series with 352 runs from five innings to be named man-of-the-series.

Lara finished the match with a flourish, plastering off-spinner Darren Lehmann for three successive sixes to remain unbeaten on 75 as the West Indies reached 249 for one in reply to Australia's struggling 247 for eight.

Chris Gayle was judged man-of-the-match with his 60 off 68 the only West Indian wicket to fall combined with his career-best ODI bowling figures of 5-46 off 10 overs in Australia's innings.

The euphoric victory buoyed West Indies cricket after their 3-1 loss in the preceding Test series to Australia and their run of four defeats in the first half of the ODI series.

While the West Indies regrouped after losing the series in Port-of-Spain, the form of Ricky Ponting's World Cup champions progressively fell away after the end of their record 21-game unbeaten run with signs of a lack of motivation seeping into the team.

The Australians leave for home on Monday for a well-earned five-week break after playing cricket continuously since last November.

The last time Australia lost three consecutive ODIs was in mid-January last year twice to New Zealand and the other to South Africa in the home triangular series.

Ponting, whose last tour match was dogged by a hip injury which forced him to retire while batting and prevented him from fielding, looked downcast after the heavy defeat.

Hinds and Gayle were major contributors to the West Indian resurgence.

Hinds followed up his unbeaten 125 off 140 balls in Friday's three-wicket victory here with another commanding performance. He belted nine sixes in the Grenada double-header.

He gave only one chance on Sunday when on 76 he hit leg-spinner Brad Hogg straight to long off where Jason Gillespie fumbled an easy two-handed catch.

Gayle scored 275 runs in the series and captured 11 wickets and did much to unhinge the much-vaunted Australian batting lineup.

Earlier, Lehmann hit his fourth one-day international century to rescue Australia to a reasonable total.

The 33-year-old Lehmann scored 107 off 109 balls with 10 fours and a six to pick the Australians up after a disastrous start to their innings.

Australia lost both openers Matthew Hayden (eight) and Adam Gilchrist (five) to careless shots for 18 runs and Ponting retired hurt after being struck on the hip by fast bowler Mervyn Dillon.

Lehmann joined in rebuilding stands of 102 with Andrew Symonds (48) and 95 off 84 balls with Brad Hogg (53) to lift the World Cup winners to a close to five runs an over, but it was no where near enough.

The Australians next play Bangladesh in two Tests and three ODIs at home in July-August, while the West Indians host Sri Lanka over the next month.