We have plenty more in us: Smith

After claiming a third-straight Test victory over New Zealand on Sunday morning, Kangaroos captain Cameron Smith said his side was still only playing to around three quarters of their ability.

The 14-8 win at the Ricoh Arena in Coventry places the Kangaroos as the outright front-runners at the 2016 Four Nations, with the world champions possessing the only two-win record after the first two rounds of matches.

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But despite his side controlling the majority of the match against the world No.1 Kiwis, Smith said Australia still haven't reached anywhere near their potential.

"I think overall the performance tonight, we were probably at 75 per cent, 80 per cent of our capabilities," Smith said.

"I think we built some good pressure at times but we allowed the Kiwis back into the game.

"It is nice to come away with a victory against the Kiwis with some work to do.

"We weren't at our best and it was a different (New Zealand) side to what we played against in Perth.

"We played quite well for the most part of the match, but there are a few things I would like to improve on for the next time we play them, if we get the opportunity again."

The Kangaroos were a class above the Kiwis through the opening 15 minutes, scoring through eventual man-of-the-match Blake Ferguson and halfback Johnathan Thurston to establish a 10-0 lead.

But from that point on Australia weren't able to score another try, and near the back end of the match came close to allowing New Zealand back into the game.

With just seconds remaining on the clock Kiwis halfback Shaun Johnson weaved through and got over the line, with some desperate cover defence the only thing preventing him from grounding the ball and putting the Kiwis within a conversion of stealing a draw.