Ashleigh Barty beats Danielle Collins 6-3 7-6 (7-2)
Barty becomes first Australian to win women's singles since Christine O'Neil in 1978
American Collins beaten in first Grand Slam final
Australians Nick Kyrgios and Thanasi Kokkinakis win men's doubles
*Barty 6-3 5-6 Collins
Barty kicks things off with an ace as she looks to set up another chance to put Collins under pressure.
But it's the American who draws an error from Barty to move ahead - two points from the set.
*Barty 6-3 5-6 Collins
Laura Robson
Former British number one on BBC Radio 5 Live Sports Extra
I feel that Collins is just about flustered with how the games have gone.
The more she gets upset with the crowd, the worse they will get.
*Barty 6-3 5-6 Collins
Collins keeps a clear mind to volley a winner at 15-15.
The American edges closer to a desperately needed hold as Barty pops a return into the net.
There it is! Collins gets her first game in five to move back in front. That took some composure.
Image source, Getty Images
Jonathan Jurejko
BBC Sport at Melbourne Park
While it slightly feels like Collins is Rocky against Barty's Drago in a Russian bearpit, there are some Americans in the house.
Two bros are particularly making a racket, from some seats just to the right of Collins' support team.
Barty 6-3 5-5 Collins*
Collins responds with a forehand to claim the opening point as she looks to reassert herself in this set.
A fine first serve moves Barty 30-15 up. A wonderful cross-court forehand takes her a point away from the game but Collins gets hold of a backhand to remain in contention.
Have that! Barty slams down an ace to bring us level at 5-5. What a fightback.
Image source, Getty Images#bbctennis
Emma Gregory: Feeling a bit sorry for Collins. Playing out of her skin here and not even a clap or cheer from the crowd for some epic points. Respect all the players!
*Barty 6-3 4-5 Collins
Gigi Salmon
BBC Radio 5 Live Sports Extra tennis commentator at Melbourne Park
Fist pump from Ash Barty and we are back on serve. It is game on, and just listen to that crowd.
Jonathan Jurejko
BBC Sport at Melbourne Park
Loud boos as Danielle Collins asks umpire Marijana Veljovic to have a word with the crowd.
Don't make her angry...
*Barty 6-3 4-5 Collins
Collins into the net!
Ash Barty breaks again!
From 5-1 down, the world number one will serve to level the second set. Incredible.
Barty 6-3 3-5 Collins*
It's unravelling a bit for Danielle Collins here.
Ash Barty has another break point.
Image source, Getty ImagesBarty 6-3 3-5 Collins*
Barty delivers again on the forehand, skipping into this one before unleashing a winner down the line.
It's 30-30. Pressure on Collins again.
Barty 6-3 3-5 Collins*
A miss from Barty and Collins is two points away from the set.
That's an excellent forehand from Barty though to stay in touch.
Barty 6-3 3-5 Collins*
No room for error here for Danielle Collins.
She's still in charge in this second set but she can't afford to give Barty any more encouragement.
Just one game required from the American to level this.
Barty 6-3 3-5 Collins*
Collins finds a route into the game, forcing a couple of misses from Barty, but it's too little too late.
The American hits long and Barty reduces the gap. The chase is on.
*Barty 6-3 2-5 Collins
The momentum appears to have swung right back to Barty here.
Collins is scrambling across the baseline as Barty fires a cross-court forehand into the corner. An ace makes it 40-0. The world number one is feeling up to this again.
Image source, Getty Images*Barty 6-3 2-5 Collins
Gigi Salmon
BBC Radio 5 Live Sports Extra tennis commentator at Melbourne Park
Interestingly Barty is gesturing towards her box, and you don't see that too often from her.
*Barty 6-3 2-5 Collins
The job isn't complete just yet for Danielle Collins!
The Rod Laver Arena crowd erupt as Ash Barty battles back to claim one of those breaks back.
Image source, Getty ImagesBarty 6-3 1-5 Collins*
Well then!
Collins moves to 30-30 but the Australian isn't going anywhere. Break point Barty.
Barty 6-3 1-5 Collins*
Can Collins see this out with minimum fuss?
Barty whips a forehand winner to move ahead - and puts away another for 15-30. Maybe she hasn't given up on this just yet...
Barty 6-3 1-5 Collins*
Danielle Collins gets the double break!
It looks like we're heading for a decider. Has Barty given up on this set? The pressure may be beginning to tell.