A guaranteed first-time Grand Slam winner awaits in Melbourne.

Both Wozniacki and Halep have reached finals before. Now one of them will go that step further.

Simona Halep v Caroline Wozniacki. That's your Australian Open women's final line-up.

Whoever wins will not only take home the trophy, but the world number one ranking.

Kerber departs to a standing ovation from an appreciative Rod Laver Arena.

Halep raises her arms high above her head before falling onto her chair. Her hands and legs are shaking. She's given everything.

Halep pushes Kerber into the corner of the court, before thudding a winner the other way.

Match point #4.

Iester Broom: wow - what a semi final, but I want Wozniacki to win the final.

Joel Newnham: If Halep wins this, the most unexpected part of the tournament will be the top two women in the world playing in the final.

Kerber saves it!

Of course she does. This match.

Deuce!

I have no idea how Kerber has just made two backhand returns while being almost bent double, but she has.

Then Halep steps in and hoicks the winner down the line.

Match point number three for Halep...

Now it's Halep that misses! Two in a row!

30-30, and Halep turns to coach Cahill to let him know she's really quite annoyed that she did that.

Out goes Kerber's forehand before Halep forces her to the right and whacks a winner to the other side.

0-30 to Halep.

Dennis Ethan: These rallies are utterly insane. Quality tennis galore

Nick: Comfortably the match of the tournament, great fight shown by both ladies. Don't want it to end!

Jamie Mann: One of the best tennis matches I've ever seen!

Lovely understatement from Andrea Petkovic...

Down the line winner from Simona Halep, standing tall and swinging her arms with all her might.

Backhand winner! Halep holds.

These two don't give up.

Kerber stays in a rally despite being pushed further and further back, before Halep eventually jogs forward and dinks a forehand over.

Now it's Kerber on the move as Halep slides with a backhand and doesn't connect. Kerber waits at the net with the forehand.

Oops, into the net goes Halep's backhand! 30-30.

This match has only been going on for two hours and 12 minutes! It feels like way longer.

Into the net goes a Halep backhand!

This is a strong service game from Kerber, slicing the ball out wide and outpacing Halep. She races to 40-15 before Halep challenges a call of 'in' on a Kerber first serve.

And... it's in! Kerber holds.

Don't ever let anyone tell you that there isn't depth and quality in women's tennis. This has been gripping.

Angelique Kerber to serve now.

Down the line goes Halep! A flick of the wrist, racquet whirling above her head, and she nails the shot.

Ace down the T. Halep holds!

Ace from Simona Halep to start, before she fluffs a forehand into the net.

She forces Kerber out wide, running after the ball, before another backhand lands right on the line, and Kerber nets. 30-15.

Both players slump forward, utterly exhausted, and yet determined to keep going.

Here's Simona Halep to serve.