Captain Ricky Ponting, out with a point to prove, anchored the Australian innings with characteristic contempt for the bowlers and helped the world champions to post a huge total, which eventually was too much for Scotland to overcome.
'Punter', who has been busy off the field trying to defend his team's recent slump and a drop in the ICC ODI rankings, made his bat talk loud and clear on Wednesday as he stroked his fourth World Cup century to propel to 334 for six.
Scotland were bowled out for 131 runs as Australia began their World Cup defence with a 203-run win.
Ponting lofted five sixes and struck nine fours in his 113 from 93 balls, his 23rd international one-day century.
He joined former teammate Mark Waugh and India's Sachin Tendulkar and Sourav Ganguly as the only batsmen to have scored four centuries at cricket's showpiece event.
He also broke Ganguly's previous World Cup record of 23 sixes and became the sixth man to reach 1,000 World Cup runs.
Ponting reached 1,000 World Cup runs when he pushed Brown sweetly through mid-on for four. He scored his hundred from 85 balls before he was bowled by Wright.
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