Postpublished at 11:03 Greenwich Mean Time 26 January 2019
Kvitova 6-7 (2-7) 7-5 3-4 Osaka*
Russell Fuller
BBC tennis correspondent at Melbourne Park
Kvitova has shown enormous courage!
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) 7-5 3-4 Osaka*
Russell Fuller
BBC tennis correspondent at Melbourne Park
Kvitova has shown enormous courage!
Kvitova 6-7 (2-7) 7-5 3-4 Osaka*
Big first serve from Kvitova, and Osaka flat-bats into the net.
Wallop. Ace number two.
Petra Kvitova, from 0-40 down, holds. Just incredible.
*Kvitova 6-7 (2-7) 7-5 2-4 Osaka
Ace!
Deuce!
My WORD.
*Kvitova 6-7 (2-7) 7-5 2-4 Osaka
And now a down the line winner from Kvitova!
30-40.
*Kvitova 6-7 (2-7) 7-5 2-4 Osaka
Second serve out wide from Kvitova - and Osaka nets.
15-40.
*Kvitova 6-7 (2-7) 7-5 2-4 Osaka
Russell Fuller
BBC tennis correspondent at Melbourne Park
Can she dig herself out of this hole which is rapidly increasing in size?
*Kvitova 6-7 (2-7) 7-5 2-4 Osaka
Streaky from Kvitova, back-to-back errors drifting long, and she's soon 0-30 down.
Now then! Three break points to Osaka come via a netted Kvitova backhand...
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*Kvitova 6-7 (2-7) 7-5 2-4 Osaka
Osaka found her serve when she needed it the most. Astonishing nerves.
*Kvitova 6-7 (2-7) 7-5 2-4 Osaka
Ace from Osaka!
She's got the advantage - and she holds with another huge forehand!
Kvitova 6-7 (2-7) 7-5 2-3 Osaka*
Well, that's one way to save a break point!
Out wide goes the Osaka serve, and Kvitova can't control her return.
Deuce.
Kvitova 6-7 (2-7) 7-5 2-3 Osaka*
Naomi Osaka's forehand is so, so good.
Two crushing strikes down the line take her to 30-15, before Kvitova finds the lines with a backhand.
Into the net goes the Osaka backhand! Break point, Kvitova.
#bbctennis
Andi: Osaka showing her true grit and courage with this fightback in the third set.
Kvitova 6-7 (2-7) 7-5 2-3 Osaka*
Strong serving from Kvitova as Osaka's backhand hits the net. The eighth seed follows it up with a forehand winner and a second serve is swept over the baseline by Osaka.
Osaka smashes a forehand winner... but Kvitova rounds it off with an ace.
#bbctennis
James Stevenson: Swings one way then the other. What an enthralling tennis match.
Ayo Obit: Difficult to predict who will win this one!
*Kvitova 6-7 (2-7) 7-5 1-3 Osaka
Welcome back, Naomi Osaka.
Much better serving, first going out wide then down the T, takes her to 40-15, but she dumps a drop shot into the net to keep the game going.
That's superb for Osaka, going out wide then popping the winner the next, and she holds.
Kvitova 6-7 (2-7) 7-5 1-2 Osaka*
Gigi Salmon
Radio 5 live sports extra tennis commentator at Melbourne Park
Osaka has wiped away the tears, she has reset and is refocused.
Kvitova 6-7 (2-7) 7-5 1-2 Osaka*
What a winner from Naomi Osaka!
She nails a backhand whip onto the service line, and the first break of the decider goes her way.
*Kvitova 6-7 (2-7) 7-5 1-1 Osaka
Russell Fuller
BBC tennis correspondent at Melbourne Park
It can't be much fun being related to one of these players right now...
*Kvitova 6-7 (2-7) 7-5 1-1 Osaka
Ouch.
Petra Kvitova double faults.
Break point, Osaka.