Last-gasp Mo'unga penalty gives All Blacks 23-20 win over Australia

Richie Mo'unga booted a penalty in the last minute to lift the All Blacks to a 23-20 comeback win over Australia in Dunedin on Saturday as the New Zealanders continued their perfect start to the season in the lead-up to the World Cup.

Trailing 17-3 at halftime, the All Blacks' 22-year winning streak against the Wallabies on home soil was in peril after the visitors dominated early at Forsyth Barr Stadium.

But tries to debutants Shaun Stevenson and Samipeni Finau saw New Zealand storm back into the game, before Mo'unga sealed the win with a well-taken kick from a tight angle.

"Yeah, absolutely gutted. Obviously not happy with it, but from where we were last week to where we are now a massive step up. A huge improvement," said Wallabies captain Tate McDermott.

Australia had made a flying start, scoring two tries in the first seven minutes to take a 14-0 lead.

Quick hands put Marika Koroibete across in the third minute and Tom Hooper barged over at the same left corner after flattening Damian McKenzie in a thunderous run.

Both teams had early casualties, with Queensland Reds hooker Matt Faessler making his test debut for the Wallabies when Dave Porecki came off early for a head injury assessment.

Brodie Retallick was off the ground with an apparent knee problem in the 26th minute.

The All Blacks' old guard stepped up in his absence, with Sam Whitelock and Ardie Savea combining to save a try when stand-in captain McDermott made a dart for the right corner.

A rare line-out failure by the hosts saw the Wallabies come off with a 14-point lead, having put together their best half of rugby since their last-gasp loss to the All Blacks in Melbourne a year ago.

It seemed inevitable that the All Blacks would find their range sooner or