And while the Aussies responded in the second half by scoring the first points through their goalkicking prop Emily Robinson, and dominating possession, there was no holding back a Black Ferns side who can see and exploit space like few others in the women's game.
This time last year the Black Ferns put eight tries past the Wallaroos in front of a small crowd at a chilly Rugby Park in Christchurch and this time they had the platform they deserve. They played in front of a crowd of 28,846, thought to be a world record for a women's international. The previous record was set in last year's women's Six Nations match between France and England in Grenoble, a match watched by a touch over 17,000.
Bolstered by professional contracts which have allowed them to train and prepare in an appropriate fashion, the Black Ferns will be extremely hard to stop this year.
The rested Portia Woodman was a notable absence, but with fullback Selica Winiata her typically elusive self at the back and the midfield partnership of Theresa Fitzpatrick and Stacey Waaka a good defensive unit, the visiting attack, while not hitting full stride, had enough quality to do the job.
They were led superbly as usual by Faamausili who was near impossible to stop close to the line. Loosehead prop Philippa Love and No8 Aroha Savage also had strong games.
A highlight, apart from the five tries scored by the visitors, was a demolition job of a scrum on the Wallaroos line which won them a penalty and reinstated their momentum after a good start to the second half by the home side.
The Wallaroos showed fight, especially in the second half, and stretched the Black Ferns at times with their offloading game. But they were too inaccurate and they defended far too narrowly, leaving far too much space out wide for the Black Ferns, who took full advantage.
The Aussies, who put far more resources into their sevens programme than their XVs game, will be better for this match. They came up against the best in the world, the benchmark in the women's game, and fell short but not by that much.
Black Ferns 31 (Fiao'o Faamausili 3, Kendra Cocksedge, Aldora Itunu tries, Cocksedge 3 cons)
Wallaroos 11 (Alisha Hewett try; Emily Robinson 2 pens)
Halftime: 19-3