Wings Adam Ashley-Cooper and Joe Tomane, replacement forward Benn Robinson and flyhalf Ben Foley also touched down for the Wallabies, who played to their traditional running strengths in the backs with returning scrumhalf Genia calling the shots.
Argentina scored tries through centre Marcelo Bosch and scrumhalf Martin Landajo with flyhalf Nicolas Sanchez kicking five points.
Australia, who had beaten Argentina 14-13 in Perth last month, had forwards James Slipper and Rob Simmons sin-binned, one in each half, while Argentina flanker Pablo Matera was also yellow carded.
- Sports & Recreation
- Marcelo Bosch
- Benn Robinson
- Joe Tomane