One of the biggest names in sport, Osaka stunned the tennis world when she pulled out of the Grand Slam on Monday after being fined and threatened with expulsion for declining to face the media after her first-round match on Sunday.
Federer returned to the courts in March, having been out for more than a year following two knee surgeries, winning his first match in Qatar before losing his second.
"(This is) my favourite tournament in the world. I'm with my people here," Sonego said. "I am so happy for this."
The 33rd-ranked Italian will have loud support from the stands when he returns to the court for his semi-final later on Saturday against top seed Novak Djokovic.
Germany's Zverev, conqueror of claycourt specialists Rafa Nadal and Dominic Thiem en route to the final, dropped his first set of the tournament. However, he fought back under a closed roof at the Manolo Santana stadium to lift his first claycourt title since 2019.
After being heckled by a loud-mouthed fan in his previous round, Nadal enjoyed an incident-free evening in an empty Rod Laver Arena to reach the round of 16 at a Grand Slam for the 49th time in his career.
Nadal won the opening six points of the match, but Norrie was not intimidated in his first meeting with the Spaniard and claimed the first break of the match to lead 3-2.
The 24-year-old, who made her Grand Slam main draw debut at Roland Garros last year, toughed out a 7-5 7-5 win over fellow-qualifier Chloe Paquet on Court Six.
"Obviously it means a lot because finally this is barrier that I had to pass, a mental barrier," Sherif told reporters.
The Australian can usually expect a febrile atmosphere when he plays on his favourite court, but a local coronavirus outbreak and unseasonably cold weather kept many punters away.
Those who did turn up were treated to some vintage Kyrgios moments - a racket thrown across the court.
Djokovic earlier told reporters he had taken a walk in a park to celebrate his release from the 14 days of quarantine players coming from overseas were obliged to undergo to play in Australia.
Seventy-two players are currently confined to their rooms in Melbourne ahead of the Feb. 8-21 Grand Slam after positive cases were discovered on three flights ferrying them to Australia.
Sousa said he tested positive for COVID-19 before his departure but has since returned a negative test and is asymptomatic.
Barty reached the semi-finals at Melbourne Park for the first time last year before sitting out most of the rest of the season at home because of the COVID-19 pandemic.
They can think whatever they like. If they expect me to win the tournament, then that's their expectations.
At the end of isolation the players are scheduled to participate in tune-up events from Jan. 31 at Melbourne Park before the Feb. 8-31 Grand Slam at the same venue.
Now I feel more positive about it and I'm trying to do the most I can do to get out of quarantine.
The 29-year-old Wimbledon champion had an eventful 2020 season in which she ran up a 17-match winning streak.
The start to her 2021 campaign will involve the long journey to Australia in mid-January before two weeks in quarantine ahead of the start of the year's first Grand Slam on Feb. 8.
Kenin won her maiden Grand Slam in Melbourne last year which set the American on course to break into the top 10 and claim the WTA Player of the Year award.
I definitely think I can talk to Novak... I think that will be helpful since we're both defending champions.