Postpublished at 10:26 Greenwich Mean Time 26 January 2019
*Kvitova 6-7 (2-7) 5-5 Osaka
Kvitova backpedals, and flashes her forehand into the net.
30-30.
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
Amy Lofthouse
*Kvitova 6-7 (2-7) 5-5 Osaka
Kvitova backpedals, and flashes her forehand into the net.
30-30.
*Kvitova 6-7 (2-7) 5-5 Osaka
Naomi Osaka thinks she's made an unbelievable passing shot - but it's just, just long over the baseline!
Oh, that's into the net from Osaka, but she's on the board as an on-the-run Kvitova goes long.
30-15.
*Kvitova 6-7 (2-7) 5-5 Osaka
Gigi Salmon
Radio 5 live sports extra tennis commentator at Melbourne Park
There is no emotion from Petra Kvitova. She knows the job is not done. You are kidding me! This should be over. But it's not over. Look how quickly things can change in tennis!
*Kvitova 6-7 (2-7) 5-5 Osaka
OH!
Long goes Naomi Osaka's forehand!
Petra Kvitova breaks back.
Kvitova 6-7 (2-7) 4-5 Osaka*
My WORD.
Naomi Osaka double faults! She hits her shoe in annoyance.
Two break points for Kvitova.
Kvitova 6-7 (2-7) 4-5 Osaka*
Shot!
Kvitova gets pushed wide with the serve, and she's nowhere near Osaka's flat winner.
15-30.
Kvitova 6-7 (2-7) 4-5 Osaka*
Aaaand Petra Kvitova gets the first point on the Naomi Osaka serve with a cross-court winner.
And that's a long backhand from Osaka! 0-30.
Kvitova 6-7 (2-7) 4-5 Osaka*
Kim Clijsters
Four-time Grand Slam champion on BBC Radio 5 live sports extra
That can have an impact on Naomi Osaka. She is a confident server though and has held pretty easily throughout the match. This is a completely different service game now though. Petra Kvitova has done nothing wrong but it's up to Naomi to take it and play aggressive tennis. She has done that so far.
Kvitova 6-7 (2-7) 4-5 Osaka*
Here we go then.
Naomi Osaka will serve for the Australian Open title.
Kvitova 6-7 (2-7) 4-5 Osaka*
Does this have to end?
Kvitova 6-7 (2-7) 4-5 Osaka*
Gigi Salmon
Radio 5 live sports extra tennis commentator at Melbourne Park
What a game from Petra Kvitova! It is still Osaka who will be serving for the title.
Kvitova 6-7 (2-7) 4-5 Osaka*
Down the T goes Petra Kvitova, and Naomi Osaka nets!
The crowd look STRESSED.
Advantage, Kvitova - sealed with a serve out wide that Osaka can't return.
Such grit from Kvitova. Osaka will have to try and serve this one out.
*Kvitova 6-7 (2-7) 3-5 Osaka
Out wide goes the Kvitova serve - and Osaka goes long!
Deuce!
*Kvitova 6-7 (2-7) 3-5 Osaka
Osaka looks up at her box as she whips a forehand over the baseline.
30-40...
*Kvitova 6-7 (2-7) 3-5 Osaka
Cross-court goes the Petra Kvitova forehand winner!
15-40.
*Kvitova 6-7 (2-7) 3-5 Osaka
Down the line aims Kvitova - and misses!
Three Championship points to Naomi Osaka.
*Kvitova 6-7 (2-7) 3-5 Osaka
Stonking return of serve from Osaka, and Kvitova can only float the ball way out of bounds.
0-30.
*Kvitova 6-7 (2-7) 3-5 Osaka
Osaka raises her hands in apology as a backhand takes a bobble off the net and drops in front of Kvitova.
She's crouching so low to use Kvitova's pace against her. It's astonishingly good.
0-15.
*Kvitova 6-7 (2-7) 3-5 Osaka
Can Petra Kvitova ask the question of Naomi Osaka?
*Kvitova 6-7 (2-7) 3-5 Osaka
Gigi Salmon
Radio 5 live sports extra tennis commentator at Melbourne Park
What a celebration! She is one game away from becoming the new Australian Open champion and world number one.