Germany strolled to a 4-0 victory over Australia in their World Cup opener and winning coach Joachim Low believes his team can get even better.

Goals from Lukas Podolski, Miroslav Klose, Thomas Muller and Cacau gave the Germans a great start to their campaign, while the Socceroos were left to rue not only the result but a red card for key man Tim Cahill.

"There is still room for improvement," said Low. "Our defence was excellent, they performed very well and I was very happy with our counter-attacks."