Australia crushed Argentina 34-9 in Mendoza on Saturday, scoring four tries to earn a bonus point and set up a Rugby Championship decider against New Zealand.
The Wallabies, who lost to the Pumas at the same venue last year, were more penetrative in attack and stronger in defence, with the home side limited to three penalties from flyhalf Nicolas Sanchez.
Australia go into the decider in Sydney in two weeks time equal on nine points with New Zealand after the All Blacks’ 27-20 victory over South Africa in Johannesburg.
Australia drew first blood with wing Joe Tomane’s 17th-minute try and went in 8-6 ahead at half-time.
They ran in a second try through replacement lock Dean Mumm just before the hour before centre Tevita Kuridrani and wing Adam Ashley-Copper ran in two more in the final three minutes for the bonus point.
Flyhalf Bernard Foley kicked 14 points.
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