The Silver Ferns have the perfect chance to inflict some lasting mental damage on Australian netball.

Tomorrow night's match against the Diamonds at CBS Canterbury Arena is a dead rubber after the Silver Ferns sealed the three-match Constellation Cup series with their narrow victory on Thursday night, but there's still plenty riding on it.

There is still plenty to improve on for Silver Ferns coach Waimarama Taumaunu, after her side nearly coughed up a 12-goal advantage to win by a solitary shot.

"It was definitely a game of two halves," Taumaunu said.

"And I was only happy with one."

Taumaunu said the third test would be a case of looking for another win but also trying out a couple of different combinations and giving more players a taste of top-level netball.

Despite the temptation to experiment, it's doubtful the side Taumaunu names is unlikely to be too much different from the side who have now beaten Australia twice.

There could be the odd quarter for Cathrine Latu or Kayla Cullen, but wholesale changes are unlikely.

Taumaunu is fiercely competitive and will want nothing more than a clean sweep over an old foe.

As well as vindicating a few of Taumaunu's coaching decisions and selections, a whitewash would also leave coach Lisa Alexander under pressure ahead of next month's Quad Nations tournament with South Africa and England.

Ferns captain Casey Williams is likely to play some part in the third test but the Silver Ferns management will wait to assess her before deciding if she will start and, if so, how much court time she is likely to see.

- © Fairfax NZ News