Ryan Harris took his 2nd 5 wicket haul in as many games as Australia inflicted a crushing 135 run victory over Pakistan.
Australia set up the victory by batting 1st and scoring a handy total of 277 from their 50 overs, Mike Hussey top scored for the hosts with 67.
Harris then took 5-19 as Pakistan were routed out for just 142 and Australia completed the victory to take a 4-0 lead in the series.
Australia have been playing some good ODI Cricket in recent times, they beat England in the Natwest One Day Series in England last summer 6-1.
Ricky Ponting's men backed up that result by going to South Africa and defending their Champions Trophy title.
Australia then defeated India in a ODI series by the margin of 4-2, had India won that series they would have moved to number 1 in the world in ODI Cricket.
Australia will now be aimimg to complete a series whitewash over the weekend.