Chasing 241 to win, West Indies collapsed without any fight and they were skittled out for a paltry 113 with more than 94 balls to spare.
While Martyn and Symonds made fifties to prop up Australian innings, Brett Lee (four for 24) an Nathan Bracken (three for 16) decimated the West Indies batting lineup.
It was completely spineless batting from West Indies top order that extended way down the order.
If Australia batted slowly in the first innings, West Indies scoring was so slow that it reminded of the first session of a test match.
Needing to score at 4.8 runs per over, West Indies could make only 20 in the first ten overs and that too by losing three early wickets.
Chris Gayle fell the very first ball, out lbw to an express delivery from Brett Lee.
Nathan Bracken then bowled an inspired spell taking three top order wickets including that of skipper Brian Lara.
First to go after Gayle was Chanderpaul, caught by Katich for 12.
Then Bracken removed Runako Morton who couldn't handle in-swing and was rapped on his pads. Morton's painful stay at the crease was all of 32 balls without opening his account.
At 20 for three West Indies needed partnerships and a good score from Lara.
But, Lara was Bracken's third victim of the day caught behind for five. However, TV replays suggested the ball might have missed the edge of Lara's bat.
With the fall of Lara, West Indies bating capitulated to abject surrender without any fight. All this while as the wickets were falling, veteran seamer Glenn McGrath bowled excellent economical spell giving away only six runs in his first six overs.Soon, Dwayne Bravo and Wavell Hinds were sent back by Watson and West Indies were six for 56.
Dwayne Smith and Ramnaresh Sarwan tried in vain to resurrect fledgling West Indies hopes. But Sarwan was run out in a terrible mix-up with Smith for 36. Brett Lee then came back to polish off the tail removing Smith, Baugh and Bradshaw. After five wicket haul against India, this was another impressive performance for Lee returning a figure of 4-24.
Earlier, electing to bat after winning the toss, Australia scored 240 for six in their allotted fifty overs on a slow wicket after the West Indian bowlers bowled a tight leash in the beginning.
Australia left out Brad Hogg and Mathew Hayden while West Indies made two changes, bringing in Ian Bradshaw and Jerome Taylor.Martyn (52) and Symonds (52) put up a crucial 73-run partnership for the fourth wicket after Australia were at a precarious 80 for three in the 24th over with both the openers as well as skipper Ricky Ponting back in the hut.
Martyn began slowly and on a pitch where good feet movement was must to survive and score. With the new man Symonds scoring at almost run-a-ball, he was happy to just rotate the strikes.
After scoring his 35th ODI fifty, Matryn tried to smash Bradshaw out of the park but only managed to hole it out to Morton at long off. He hit five fours in his 77-ball knock.
Once the partnership was broken, Symonds too followed Martyn back to pavilion. The sturdy right-hander hit two fours and two mighty sixes for his 59-ball 52.
Symonds was allured to play in air by Sarwan and was caught at long leg boundary.
With two new men in Michael Clarke and Michael Hussey at crease, scoring quick in the end overs was never going to be easy. Ramnaresh Sarwan had another success when he removed Clarke for 23. Hussey and Bradd Haddin made some runs but such tight was West Indies bowling line and length that even till the last ball slogging was not possible.
Earlier, the Oz didn't get it going in the beginning and the West Indian bowlers gave anything but room to the batsmen to chance their arms.
Mathew Hayden was benched and Shane Watson again found himself promoted up the order. Both Simon Katich and Watson looked settled to see off the new ball than to score. Ian Bradshaw and Dwyane Smith took full advantage of a slow pitch and overcast conditions, putting extra premium on scoring.
Watson tried to break the shackles and hit Smith for two fours in the sixth over to pep up scoring. But he tried a little too hard and found himself on his way back after edging Bradshaw to the first slip for 18.
Skipper Ricky Ponting was tentative and could survive only 12 balls before falling lbw to Taylor in his first over. At 37 for 2, another top order collapse was imminent but Simon Katich and Martyn fighting tried raising a partnership. Katich was painfully slow in his scoring and consumed 66 balls for 25. He was sent back by Gayle after he added 43 runs for third wicket with Martyn.