The man who will win or lose the World Cup

Cricket fable Ian Chappell says Australia's fortunes successful the Twenty20 World Cup last whitethorn hinge connected David Warner.

The Aussies instrumentality connected New Zealand from 1am (AEDT) for the close to assistance the trophy.

Warner - the 35-year-old opening batter whose aboriginal successful the crippled was being questioned lone a fewer weeks ago - was instrumental successful getting the Aussies to the tourney decider.

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Shaking disconnected a thin pre-Cup tally of form, the left-hander has deed 89 and 49 successful his past 2 matches to powerfulness his broadside to the final.

"Warner and Australia's batting I deliberation is the large thing. If Warner gets going helium tin enactment the crippled retired of your scope successful a large hurry," Chappell told Wide World of Sports.

"They've got beauteous beardown batting. New Zealand astir apt trust much connected their bowling, truthful I'd accidental Australia's batting is the key.

Mark Taylor previews Australia's T20 World Cup last against New Zealand

"That's the happening with T20 cricket. One oregon 2 atrocious overs (can suffer the game), oregon 1 oregon 2 bully overs tin triumph you the game."

While Warner is simply a fastener astatine the apical of the order, his superstar teammate Steve Smith is precise overmuch a moving part.

The classy right-hander has lone been required to bat successful 4 of Australia's six World Cup games.

He's batted lone doubly successful the past 4 matches, and been retired for 1 and 5.

Outspoken cricket large Shane Warne questioned Smith's spot successful the T20I squad recently, but Chappell is having nary of it.

"If he's not a invaluable subordinate successful the game, there's thing incorrect with the game. That would beryllium my answer," Chappell said.

Australia players observe the dismissal of Pakistan's skipper Babar Azam. (AP)

"He's a precise bully player. If the crippled can't find a spot for him past there's thing incorrect with the game.

"They look to nonstop him successful aboriginal if they suffer a wicket aboriginal to stabilise things, and if they get going helium slides down the order.

"It's going to beryllium connected if Australia gets distant to a bully start, you'll astir apt spot Steve Smith descent down the order."

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