Australia thrashed South Africa by 276 runs in the final one-day international in Mackay to avoid a first whitewash in an ODI series on home soil.
The hosts amassed their second-highest ODI total as they finished on 431, with their top three all scoring centuries.
They went on to secure their second-biggest ODI victory, with South Africa all out for 155 in 24.5 overs as Cooper Connolly – two days after his 22nd birthday – took five wickets for just 22 runs.
South Africa, who suffered their heaviest ODI defeat in terms of runs, had already clinched the series by winning the first two contests.
“A pretty crazy day, wasn’t it?” said Australia captain Mitchell Marsh.
“A full performance from the lads. Shame it was a little bit too late but full credit to South Africa. They played outstandingly well in the first two games.”
Marsh, Travis Head and Cameron Green each scored hundreds for Australia – with Green’s ton coming off only 47 balls.
In response, South Africa fell to 50-4 in the ninth over and were unable to recover.
“We were under the pump from the first ball,” South Africa captain Temba Bavuma said.
“They put us under pressure. They made it look like a very good surface, and they were far better than us today.”
South Africa’s Keshav Maharaj was awarded player-of-the-series for his six wickets.
Australia’s highest ODI total came against South Africa in 2006, when they scored 434.