Australia force T20 series decider

Australia crushed New Zealand by 50 runs in a low-scoring fourth T20I in Wellington Friday to level the series at 2-2.

The result sets up a winner-takes-all blockbuster in the final match at the same venue on Sunday, with Australia in red-hot form after struggling early in the series.

The Australians scored 156 for six in their 20 overs after winning the toss and electing to bat.

In reply, New Zealand were all out for 106 after 18.5 overs.

Captain Aaron Finch anchored the tourists' innings with a gritty 79, making him Australia's most prolific T20 international run scorer on 2,310, ahead of David Warner's 2,265.

Finch chiselled out his 14th T20 half-century off 55 balls before cutting loose with four sixes in the final over, in which Kyle Jamieson conceded 26 runs.

But he struggled for partners as the Black Caps pinned back Australia's batters with accurate bowling and a steady flow of wickets.

Despite his man-of-the-match batting performance, Finch singled out his bowling attack for praise, saying they were outstanding on a wicket that did noy play as expected.

"I thought we adapted really well, it was a really polished performance with the ball," he said.

New Zealand skipper Kane Williamson was frustrated at a passive display that he said needed to improve for Sunday's decider.