Naomi Osaka 7-6 (7-2) 5-7 6-4 Petra Kvitova
Kvitova saves three championship points to force third set
Osaka becomes world number one after winning back-to-back Grand Slam titles
Jonathan Jurejko
BBC Sport at Melbourne Park
Osaka just stands motionless at the baseline after Kvitova blows her off court to break. Looking up, I think, at the big screen, puffing her cheeks out.
*Kvitova 6-7 (2-7) 2-0 Osaka
Second serve from Naomi Osaka - pummeled for a forehand winner by Petra Kvitova!
Kvitova 6-7 (2-7) 1-0 Osaka*
Good return from Kvitova, leaping off the floor - and Osaka nets from down low!
Another break point for Kvitova.
Image source, Getty ImagesKvitova 6-7 (2-7) 1-0 Osaka*
An ace and a "come on!" get Osaka in front...
...and that's a better shot from Kvitova on the forehand, and she darts forward to finish off the rally.
Back to deuce we go.
Kvitova 6-7 (2-7) 1-0 Osaka*
Oh, and Osaka's backhand helps her slice her way out of trouble!
Deuce.
Kvitova 6-7 (2-7) 1-0 Osaka*
Kvitova's forehand has temporarily gone walkabout, as she sends a nasty shank over the baseline.
It's working alright on that one, though, a winner going whizzing on to the tramlines for 30-30.
Shot! Down the line goes Kvitova, beating Osaka's outstretched dive, and she's got herself a break point.
Kvitova 6-7 (2-7) 1-0 Osaka*
A lovely sliced drop shot brings up 30-0 for Kvitova but she pushes her next backhand over the baseline.
A wayward forehand follows and Kvitova is under pressure again. Osaka then tries a curling forehand around the net but misses and Kvitova holds when the 21-year-old slumps a return into the net.
Important hold.
#bbctennis
James Stevenson: As expected, a close first set. But not a close tiebreak. Osaka zoned in for that tiebreak. Didn’t look like missing.
Image source, ReutersKvitova 6-7 (2-7) Osaka
Jonathan Jurejko
BBC Sport at Melbourne Park
Not great news for Kvitova. Osaka has won her past 59 matches after taking the first set... Incredible record.
Kvitova 6-7 (2-7) Osaka
Russell Fuller
BBC tennis correspondent at Melbourne Park
After an incredibly tight first set, she has won the tie-break. She's a set away from coming to Melbourne just after her 21st birthday and adding an Australian Open title.
Kvitova 6-7 (2-7) Osaka
The first set goes Naomi Osaka's way!
Image source, ReutersKvitova 6-6 (2-6) Osaka*
Flat-footed from Kvitova, and a netted backhand gives Osaka four set points.
Kvitova 6-6 (2-5) Osaka*
Forward comes Kvitova - and she's passed by Osaka's forehand!
Change of ends, and Kvitova clonks a first serve down the T.
Kvitova 6-6 (1-4) Osaka*
Ace from Osaka. Kvitova thinks she's heard a net cord, but there's no bleep.
And another lovely cross-court swipe from Osaka, off a Kvitova mis-hit, extends her lead.
Kvitova 6-6 (1-2) Osaka*
Shot! Osaka moves quickly across to pick up the Kvitova wide serve, and times the backside off a winner.
Long goes the Osaka backhand, and Kvitova is on the board.
Jonathan Jurejko
BBC Sport at Melbourne Park
"Ayyyaaahhhhh!" A throat-hurting scream from Kvitova pierces the calm Melbourne air, showing her relief at digging deep to take this set into a tie-break.
Image source, EPA*Kvitova 6-6 (0-1) Osaka
A deep return from Naomi Osaka, and Petra Kvitova shanks it out of play.
Kvitova 6-6 Osaka*
Naomi Osaka will serve first in the tie-break.
Kvitova 6-6 Osaka*
Second serve from Kvitova, and it's hit long by Osaka!
A chance for Kvitova to hold - and hold she does with a cross-court winner!
Hello, tie-break.
*Kvitova 5-6 Osaka
Kim Clijsters
Four-time Grand Slam champion on BBC Radio 5 live sports extra
I love how both players started with their emotions composed but when the important moments arrive, they are not afraid to show it.