Lionel Messi broke the deadlock for Argentina to inspire the South Americans to a 2-1 victory over Australia in his 1000th appearance for club and country.
Argentina early penalty shout waived off by the referee as Argentina claimed that a Palau Gomez cross had hit the arms of an Australian Keanu Baccus.
Australia were keeping it tight at the back, until they conceded a free kick which was repelled out by the defense towards the path of Mac Allister who flicked it to Nicholas Otamendi. The Argentine center back set up Luis Lionel Andres Messi to score a curling shot into the bottom corner.
One became two in the 57th minute when Australia goalkeeper Matthew Ryan tried to run with the ball in his box but pressure from Angel Dimaria was enough to set up Julian Alvarez for the easiest goal of the tournament.
13 minutes before the regular 90, a 25 yard shot from Craig Goodwin had a huge deflection from Enzo Fernandez to end up inside the net with Eminialo Martinez left stranded.