Australia managed to overcome a gutsy Argentinean side in a hard-fought 25-19 win for the Wallabies in Rosario, Argentina.
Wallabies fullback Mike Harris and Pumas fly-half Juan Martin Hernandez exchanged penalties in the first half, giving the visitors a 15-9 lead.
The penalty duel was cracked when Wallabies winger Digby Ioane made a clean break after Kurtley Beale threw a perfect pass from a set-move.
The determined Pumas crossed the try line through Juan Imhoff with three minutes left, but shocking handling errors cost the hosts a chance of a memorable comeback victory.
The triumph means Australia ended the inaugural Rugby Championships in second place on 12 points, 14 points behind New Zealand.
Australia: 25 (D Ioane try; M Harris 1/1 con; 6/7 pens; K Beale 0/2 pens)
Argentina: 19 (JJ Imhoff try; M Bosch 1/1 con; 1/1 pen; JM Hernandez 3/5 pens)