Osaka, 21, said she lacked maturity when as a relative unknown player she won the tournament last year to kick off her meteoric rise through the rankings.
Naomi Osaka is also the first woman to win a second Slam immediately after her first since Jennifer Capriati in 2001 but her meteoric rise has been followed by a distinct dip ahead of Roland Garros.
Osaka will bid for her second Grand Slam title in succession against twice Wimbledon champion Kvitova on Saturday, having claimed her maiden major in New York last year by upsetting Serena Williams in the final.
Families of two Americans killed in terror attacks in Brussels and Paris have sued Twitter, accusing the micro-blogging site of being a "tool and weapon of terrorism".
Fulham defender Sascha Riether has been charged by the FA with violent conduct for a challenge on Manchester United's Adnan Januzaj which was not seen by the match officials after the incident was dealt with under a new scheme.
These eight images show that we live in a crazy, mad world!
Dominic Thiem, the only player to beat claycourt giant Rafael Nadal on the red dirt this season, is one of the dark horses at the French Open - and the Austrian feels he deserves the tag.
Federer was leading 4-3 when Zverev stopped mid-rally after a ball slipped from a ball boys' hand and into his line of vision.
But for the first time, that golden trio will be having an anxious glance over their shoulders. The past week in London has revealed a new fearlessness in the generation of 20 somethings expected to fill the void when they call it a day.
Osaka has had to mix things up during a grinding progression to the last eight at Melbourne Park
Roger Federer has paid a glowing tribute to Alexander Zverev, hailing the 20-year-old German as having the 'full package' of skills.
Top seed and defending champion Roger Federer returned to form to beat Japan's Kei Nishikori 6-4, 7-6(4) and reach the Shanghai Masters semi-finals on Friday.
World number one Naomi Osaka was beaten in her opening match at the Dubai Duty Free Tennis Championships on Tuesday, losing to France's Kristina Mladenovic 6-3, 6-3 on her return to competitive action after winning last month's Australian Open.
IMAGES from all the Bundesliga action on Saturday.
Petra Kvitova takes on Naomi Osaka in Saturday's Australian Open final with one of them set to emerge as a fresh champion at Melbourne Park as well as the new world number one.
In fact, barring 2014 when Stan Wawrinka won the title, no player apart from the quartet has even been involved in the men's final at Melbourne Park since 2008.
Qiu Bo recovered from a shaky start to secure a second straight 10-metre platform gold at the world championships in Barcelona on Sunday as dominant China ended the diving competition with nine titles out of 10 contested.
The Australian fell to the floor in celebration after clinching the victory, before sticking a finger behind his ear and asking the raucous crowd to cheer louder.
10 photos that show we live in an odd, odd world!
IMAGES from Day 5 of the 2020 US Open in New York on Friday.
Mischa still finds time to tease 'Sascha', despite his little brother's rapid ascent up the tennis rankings.
Bundesliga champions Bayern Munich suffered their first league defeat in 18 months when they slumped to a 1-0 loss at Augsburg on Saturday as Sascha Moelder's first-half strike ended their record 53-game unbeaten league run.
'Everyone thinks it was a money-related issue, but it wasn't'
The Scot lost 6-4, 6-4 to Richard Gasquet in his first singles match since January before saying he had turned down a wild card into the men's draw at the year's final Grand Slam.
Roger Federer rallied from a set down to beat Moldovan surprise package Radu Albot 4-6, 7-5, 6-3 in a stuttering start to the 20-times Grand Slam champion's Miami Open campaign on Saturday.
India's number one singles player Prajnesh Gunneswaran beat Jay Clarke of Great Britain in straight sets to enter the main draw of the Miami Open, on Wednesday.
A summary of sports events and sports persons, who made news on Tuesday
Roger Federer stared down defeat and saved two match points before knocking Tomas Berdych out of the Miami Open on Thursday with a 6-2, 3-6, 7-6(6) victory in their thrilling quarter-final.
Summary of sports events and persons who made news on Thursday
Though hunger levels are not alarming in India, it still fares badly, lagging behind Nepal and Sri Lanka on the Global Hunger Index.
Cristiano Ronaldo bagged his first five-goal haul in Real Madrid's 9-1 hammering of Granada while title-chasing Bayern Munich and Chelsea won again in Germany and England.
IMAGES from the Australian Open on Tuesday.
The scandal has also rocked the wider car market, with manufacturers fearing a drop in diesel car sales.
Volkswagen did not name a successor, but said proposals on management appointments would be made to a full board meeting on Friday.
Volkswagen is under huge pressure to act, with its shares down more than a third in value since the crisis broke, and the bad news still coming.
German prosecutors launched an investigation on Monday into fraud allegations against former Volkswagen boss Martin Winterkorn.
The 2015 edition of the Sony World Photography Awards, the world's biggest photography competition, has announced the shortlists.
Internet-based systemic wisdom connects machines and people, and will drive next-gen enterprises, said Huawei's Yatish Nagavalli.