The winner at Rod Laver Arena is not only guaranteed a long-awaited maiden grand slam title but also the world number one ranking in the game of thrones that women's tennis has become in Serena Williams's absence.

The final will be the first between two non-slam winners in 38 years, since Hana Mandlikova beat home favourite Wendy Turnbull in 1980.

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But in a fortnight where the seeds have been scattered to the wind, Halep and Wozniacki may both feel fortunate to still be in the hunt.

In arguably the clash of the tournament, top seed Halep had to save three match points and battle back from a set down in a marathon thriller against American Lauren Davis in the third round.

Still recovering from an ankle injury, the Romanian needed to save two further match points in another three-set classic against 2016 champion Angelique Kerber in the semi-finals.

Second seed Wozniacki also had to save two match points and claw back from 5-1 down in her early round match against Croatia's Jana Fett.

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Head-to-head record

When they last met, eventual champion Wozniacki thrashed Halep in straight sets in the round-robin phase of the WTA Finals in Singapore in October and holds a 4-2 career record over the Romanian.

But on hardcourts, the ledger is square at 2-2.

"It's going to be a different match, new match, a tough one. Emotions are there," Halep said.

"Pressures are there for both of us. We'll see what is going to happen."

Third time lucky

They will both privately burn for a breakthrough as two players who have come close but never quite been able to seal the deal.

Each have failed twice in Grand Slam finals and long played with queries about whether they have the mental fortitude to clinch one of the major trophies.

Wozniacki, who lost the 2009 U.S. Open final to Belgian Kim Clijsters and again in 2014 to Williams, laboured under the tag of "world number one without a grand slam" for the 67 weeks she was at the top in 2010-12.

Since October, 26-year-old Halep is now the holder of that dubious honour, having missed out in last year's French Open final to Latvian teen Jelena Ostapenko and also to Maria Sharapova at Roland Garros in 2014.

In a tournament that has shaken out a raft of baseline bashers, it is two scrambling counter-punchers that have survived and now have their chance.