A hat-trick from Adam Ashley-Cooper helped Australia beat Argentina 29-15 to book their place in the World Cup final against New Zealand.
Rob Simmons kicked things off in the opening minute charging down a clearance kick and running over for the first try of the game for the Wallabies.
Nicolas Sanchez kicked three first-penalties for the Pumas but that was in-between a brace from Ashley-Cooper who put Australia in command leading 19-9 at the break.
Argentina refused to give up however and two further penalties from Sanchez brought them within seven points with just over 15 minutes to go.
But despite throwing everything they had in the battle, they could never break the Australian defence and they saw their hopes shattered by Ashley-Cooper ten minutes from time.