World No 2 Australia kicked off group B with a 17-6 beating of Japan, a 5-1 final quarter enhancing the eventual margin.
There were three goals apiece for Gemma Beadsworth, Hannah Buckling and Rowena Webster, with two each for Holly Lincoln-Smith, Zoe Arancini and Nicola Zagame.
Hosts New Zealand were beaten 15-7 by Canada in the final game of the opening day.
A 5-0 blowout in the second quarter marred for New Zealand what was otherwise an encouraging night's work. The lost the other three quarters each by a solitary goal.
''It's not too bad," New Zealand coach Attila Biro said. ''I'm not happy but the game was okay and hopefully we will get better and better."
Sarah Landry and Jasmine Myles scored three goals apiece for New Zealand with late call-in Liana Dance getting the other.
Emma Wright and Monika Eggens scored three each for Canada, with Shae Fournier, Carmen Eggens and Dominique Perrault scoring twice each.