“I have wanted this for so long, and I have been in one other Grand Slam final and it did not go my way,” said an emotional Keys, whose coach Bjorn Fratangelo is also her husband.
“I didn’t know if I was ever going to get back to this position to try to win a trophy again.
“I’m mostly just really proud of myself to get back to this position, to be able to play the way that I played and finish on such a strong note.”
The American had been tipped as a future world No 1 after winning her maiden WTA Tour match at the age of 14.
She made her first major semifinal at Melbourne Park 10 years ago as a 19-year-old, but a decade on she can finally call herself a Grand Slam champion.
“I made my very first Grand Slam semifinal here in Melbourne,” said Keys, the runner-up at the US Open in 2017.
“So to now have won my first Grand Slam in the same place means the absolute world to me.
“My team believed in me every step of the way. So thank you so much,” added Keys, who has now equalled the career-high ranking of seventh in the world she attained nine years ago.
“They believed in me when I didn’t believe in myself and helped me every step of the way. Last year was so tough, with some really bad injuries, I didn’t know if I was gonna be able to do it again.”
Keys becomes the fourth-oldest first-time winner of a major since the Open Era began in 1968.
Sabalenka was gracious after her first Melbourne defeat since 2022.
“First of all, Madison, what a tournament. You have been fighting really hard to get this trophy,” Sabalenka said.
“I really feel like it’s home when I’m here, and I’ll come back stronger and do my best next year.”
It was Keys who came out of the blocks playing exemplary tennis to put Sabalenka under pressure and race to the first set in 35 minutes at Rod Laver Arena.
The Belarusian began to flip the script in the second set, breaking in the third game and moving ahead ominously 3-1.
Another break followed on a brilliant Sabalenka cross-court pass and she levelled the match after an hour and 20 minutes on the court.
The 26-year-old Sabalenka by now was timing the ball much better and a younger Keys might have buckled.
But this mature version of Keys, who battled all the way to beat Iga Swiatek in a 10-point final-set tiebreak in the semifinals, is made of sterner stuff.
At 5-6, when Sabalenka served to take it to another final-set tiebreak, Keys brought up two match points.
She held her nerve to secure the long-awaited title on the second with her 29th winner after two hours and two minutes.
“I think when you get to the point of finals, it’s trophy or nothing,” said Sabalenka, who is the reigning US Open champion.
“But I have to be proud of myself with three finals in a row. That’s something crazy.”