Roger Federer beats John Millman 10-8 in fifth-set champions tie-break
Coco Gauff beats defending champion Osaka 6-3 6-4
Serena Williams knocked out by Wang Qiang in three sets
Caroline Wozniacki retires after defeat by Ons Jabeur
Novak Djokovic into last 16
Australian Open third round from Melbourne Park
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*Osaka 1-2 Gauff
Huge cheers for Coco Gauff as she blasts a backhand through Naomi Osaka's defences but she's not happy as she misses the next two shots to go 15-30 down.
Gauff blasts a winner cross-court for parity and an easy forehand is thwacked away to hurry the teen away to a hold.
World number one Ashleigh Barty is safely through to the fourth round with a 6-3 6-1 win over the in-form Elena Rybakina.
She'll face Alison Riske, who ousted her at Wimbledon, after Riske beat Barty's doubles partner Julia Gorges.
Last year's finalist Petra Kvitova continued her march through the early rounds by beating Ekaterina Alexandrova 6-1 6-2.
She'll face 22nd seed Maria Sakkari next after the Greek ousted 10th seed Madison Keys 6-4 6-4.
Image source, Getty ImagesOsaka 1-1 Gauff*
Coco Gauff almost wrongfoots Naomi Osaka with a drop shot - she is a cracking doubles player - but her follow-up volley is long, and Osaka gets on the board first.
Osaka makes a meal of a smash for 15-15 but the defending champ is such a good server, and she holds with ease courtesy of two big serves.
*Osaka 0-1 Gauff
First job done for Coco Gauff.
Here's Naomi Osaka to serve.
*Osaka 0-1 Gauff
A nice baseline rally and it's Coco Gauff who wins this mini-tussle as Naomi Osaka overcooks a return.
Advantage, Gauff - and Osaka skews a backhand to hand the young American a hold.
Osaka v Gauff*
Coco Gauff gets the first point on her serve before she watches Naomi Osaka batter a brute of a forehand past her for 15-15.
A crunching return from Gauff is netted by Osaka and she belts a smash away to take a 40-15 lead.
Osaka isn't going away, though, and she takes us to deuce courtesy of a winner down the line.
* denotes next server
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Osaka v Gauff
Right. Tennis!
Coco Gauff will serve to get us under way.
Osaka v Gauff
Venus Williams had won four of her seven majors before Coco Gauff was born.
In fact, Gauff was born after the whole Britpop: Blur v Oasis battle.
Man, I'm old.
Osaka v Gauff
Coco Gauff on Naomi Osaka: "I'll be less nervous this time ... at the U.S. Open I was nervous. It was my first time on Arthur Ashe."
"We're both familiar with each other's games. She plays really aggressive. This time coming in I'm going to be more aggressive... I think I'm more confident this time around."
Osaka v Gauff
Coco Gauff is the first American woman in 30 years to reach the third round at her first three Grand Slam appearances.
She reached the last 16 at Wimbledon after coming through qualifying, where she lost to ultimate winner Simona Halep, and she repeated her first-round win over Venus Williams earlier this week.
Should she beat Osaka, she would be the youngest woman to beat a top five opponent since Jennifer Capriati, then aged 15, beat world number three Gabriela Sabatini in the quarter-finals of the 1991 US Open.
Image source, Getty ImagesOsaka v Gauff
Naomi Osaka is bidding to become the first woman to defend her Australian Open title since Victoria Azarenka in 2013.
Eight of Osaka's 13 Slam match losses have come in the third round, but when she and Gauff met at this stage at the US Open, Osaka was the runaway winner.
Coming in to Melbourne, Osaka reached the semi-finals of the Brisbane International, where she lost to eventual champion Karolina Pliskova despite holding match points.
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Her career ended where she had her greatest triumph.
It was fitting that Dane Caroline Wozniacki's career came to at end the Australian Open.
The former number one realised her dream two years ago when she won her one and only Grand Slam, in Melbourne. Fast forward to 2020 where a third-round defeat by Tunisian Ons Jabeur brought an end to her career on another emotional day.
Image source, EPA
Image source, Rex Features
Image source, EPASerena's coach, Patrick Mouratoglou, had this to say following her surprise defeat.
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Wang Qiang had only won one game and 15 points last time she played Serena Williams, at last year's US Open quarter-finals.
But the Chinese 27th seed avenged that defeat with a 6-4 6-7 (2-7) 7-5 win over the seven-time champion.
It was a superb display by Wang who will now play Ons Jabeur, who defeated her friend Caroline Wozniacki.
Image source, Rex FeaturesFirst up, here's the biggest story of the day so far...
Osaka v Gauff
And up next is another Grand Slam champion, taking on a possible champ in the making?
The last time Naomi Osaka and Coco Gauff met at a Slam, it all got very emotional.
Image source, Getty ImagesTwo Grand Slam champions have already bowed out today at Melbourne Park.
First it was Serena Williams, with Wang Qiang getting her revenge for the US Open mauling...
Image source, Getty Images...and then Caroline Wozniacki waved goodbye to tennis with a trademark, gutsy, three-set effort.
Image source, Get