Osaka's win means she is now the World No. 1 player - the first Asian player (man or woman) to ever reach the rankings summit.
In the second set, she was up 5-3 and love-40 with triple-championship point on Kvitova's serve.
Kvitova saved two set points to force a tie-break but Osaka ran away with it 7-2, taking the first set the Czech had conceded in the entire tournament.
She regained her cool and clipped a clean backhand victor to take a break point in the third game of the decider and was up to the task when Kvitova forced her to serve for the match.
It was a marked contrast to her maiden Slam win past year when Osaka cried as boos rang around Flushing Meadows following losing finalist Serena Williams' tirade at the umpire.
The last person to win her first two Grand Slams back-to-back was Jennifer Capriati in 2001. As I said on the court, I didn't know if I'm going to hold the racket again.
"I can not believe I just played the final of a grand slam again", said Kvitova, just 25 months since doctors feared she'd never play again after being stabbed and having her left playing hand - which she described as her "greatest gift" - shredded in a violent attack in her own home.
"Hello!" she said, drawing a laugh from the crowd. "Behind a tennis player is always a team so I'm really grateful", she continued, before concluding her speech by admitting she had forgotten a bit of what she was "supposed to say".
The fourth seed and US Open champion made it two Grand Slam titles in a row after a see-sawing 2hr 27min match.
"I knew that Petra couldn't keep it up for that long if Naomi could just manage those emotions", said Osaka's coach, Sascha Bajin, "and she did that beautifully". Now, after two years of burgeoning stars and bewildering upsets, the sport has a woman ready to lead from the top. "I don't think that I could really imagine the time to be kind of this player again".
Kvitova had won her past 22 Grand Slam matches after winning the first set.
And to think, a year ago, Osaka was ranked 72nd.
"Huge congrats to you and your team and you are really awesome and I am really honoured to have played you in the final of a Grand Slam".
"It's insane, I can't believe I just played a final of a Grand Slam again".
"It's insane. I can hardly believe that I just played in a Grand Slam (final) again", she said after making a slam final for the first time since 2015.
Soon after her Melbourne Park win, Japanese Prime Minister Shinzo Abe tweeted: "I'm so proud of the birth of the new world queen". But Kvitova played terrifically there, while Osaka began to get jittery. Turned out, that wasn't the case. "And, yeah, the third set was just one break".
President Josep Maria Bartomeu, general manager Pep Segura and CEO, Òscar Grau were in Amsterdam on Wednesday to close the deal. De Jong will earn around 16 million euros per year - 10 million net, with another six million in performance-related bonuses.
The genre-defining masterpiece Resident Evil 2 returns, completely rebuilt from the ground up for a deeper narrative experience. Though we don't know much about the mode, we do know that it will have a few enemies that players won't find in the base game.
On Sunday, Iranian Quds Forces operating in Syria launched a surface-to-surface rocket from Syria aimed at Israel's Golan Heights. The Israeli raids caused one of the highest death tolls of the raids Israel has undertaken to fight Iran's entrenchment in Syria.
While some of the other potential 2020 contenders like former Vice President Joe Biden and Vermont Independent Sen. Harris, California's former attorney general who won a seat to replace longtime Democratic Sen.
As fans know, the TV show has veered off from Martin's books due to necessity, as a new book hasn't come out since 2011. It's unclear if it's footage from season 8 or just some teaser footage to further build anticipation.
The duke has also made contact with the driver and passenger of the other vehicle , who were injured, and sent his "best wishes". The palace said the accident happened Thursday afternoon near the queen's country residence in Sandringham in eastern England.
Now the clients of Windows 10 devices have to make a smart selection among Android or iOS supported cell phones. With the next update to Windows 10, the software giant aims to improve the user experience.
CNN's Will Ripley reports that Kim Yong Chol will bring a response from Kim Jong-un to a personal note sent by Trump earlier. FILE - In this July 26, 2015, file photo, North Koreans look at paintings on display in Pyongyang, North Korea.
This came few weeks after the Brazil attacker said that every top player "has to play" in the Premier League. PSG won the game with an early goal from Edinson Cavani and a late one from Angel Di Maria.
Goalkeeper Petr Cech, who has played for both teams in his illustrious career, announced he will retire at the end of the season. We have to be careful. "I'm not sure they're better than before [yet], but one thing for sure is they've got a nice future".
Asked why, at 31, she is still putting herself through the pain, Sharapova said: "I still really have the passion for this". His only hiccup came when he served for the match in the ninth game of the third set and was broken at love.
As USA Today 's Andy Nesbitt put it on Thursday, Patriots quarterback Tom Brady "has been to what feels like 90 Super Bowls". New England excels at quick, short passes that eat clock and keep the ball in Brady's hand.
The Pacers now hold the No. 3 seed in the Eastern Conference and are 17 games above.500 for the first time in 4½ years. The Pacers would go on to beat the Raptors 110-106 to move a season-high 17 games over the.500 mark.
Then the NAO went briefly and dramatically positive, coinciding with the ice loss pause, before dipping negative again. More importantly, though, the warning concludes that faster sea level rise is inevitable without intervention.
The same logic would seem to hobble Green Book , whose five nominations do not include a best director nod for Peter Farrelly. On Tuesday, the 61-year-old filmmaker received his first ever Best Director Oscar nomination for last year's BlacKkKlansman .
The rare alignment of our star, moon and home is called a 'Super Blood Wolf Moon.' And there won't be another like it until 2021. The January eclipse stunned space enthusiast around the world as the Super Blood Wolf Moon turned a deep shade of red overnight.
As a counter, President Trump denied Pelosi and other politicians the use of military aircraft to travel overseas to Afghanistan. We voted for Trump and got Jeb!,' conservative author Ann Coulter complained on Twitter Saturday.
Yastremska recalls swinging her racket in the living room at home while watching on TV at age 8 as her favourite player competed. Yastremska was born in 2000, the year after Serena won her initial major, and grew up cheering for someone she calls "a legend".
The duchess later described her early experiences with her rescue dog Guy, who had been traumatised by earlier experiences. Meghan was first spotted wearing the sentimental piece on the first day of the royal tour of Australia in October.