Federer beats Gasquet 6-2 7-5 6-4
Djokovic through in straight sets
Kerber thrashes Sharapova 6-1 6-3
Halep wins final set 15-13 to survive marathon match
Watch highlights on BBC Two from 15:00-16:30
Del Potro 3-6 Berdych
Hello!
Tomas Berdych has recovered enough from his little outburst at the umpire to take the first set against Juan Martin del Potro. An 80% win percentage behind his first serve seems to have served Berdych well.
*Djokovic 1-0 Ramos-Vinolas
An entertaining little tussle for Novak Djokovic first up.
Djokovic had three break points against Albert Ramos-Vinolas but a series of backhand errors allowed Ramos-Vinolas to force deuce.
Kerber v Sharapova
Kerber and Sharapova are the only two Grand Slam champions remaining in the women's draw.
Sharapova, who claimed the title in Melboune ten years ago, has not won a Slam since her French Open crown in 2014.
Kerber won both the Australian and US Open in 2016, but she had a horror run of form last year that saw her relinquish her world number one title.
Image source, Getty Images
Courtney Nguyen
WTA reporter on BBC Radio
We pretty much know Angelique Kerber is back. She's been so businesslike and she's better than 2016 in the way she's playing. She's going to have her hands full against Maria but she is my pick in that match.
Kerber v Sharapova
Angelique Kerber has dedicated herself to putting memories of last year behind her.
She hasn't lost a match this year, and kicked things off in style by winning the Sydney International
She beat Venus Williams and Dominika Cibulkova on her way to the final, before overpowering Ashleigh Barty to claim her 11th career title.
Image source, EPA*Del Potro 2-4 Berdych
There's a bit of a kerfuffle over on Hisense Arena.
Tomas Berdych, who has just broken Juan Martin del Potro, is very unhappy about an overrule that has seen a point being awarded against him. He's up a break on del Potro.
Djokovic v Ramos-Vinolas
Novak Djokovic's return to the scene has brought him face-to-face with Albert Ramos-Vinolas today.
Djokovic is searching for his seventh Australian Open title, and standing between him and a place in the last 16 this time is a player he has a 4-0 record against.
This is already Ramos-Vinolas' best performance in Melbourne - he's fallen in the first round five times in seven appearances.
The left-hander is bidding for his third victory against a top 20 player at a Slam, after previously beating Milos Raonic and Lucas Pouille at Roland Garros.
Image source, Getty Images
Piers Newbery
BBC Sport at Melbourne Park
After two days of unsurprisingly modest attendances, relatively speaking, the return to non shoe-melting temperatures has seen a bumper crowd as the weekend has begun. A day-session record 62,674 people have passed through the gates, and most of them seem to be currently rubbing shoulders in Garden Square jostling for space.
The big screen has just delivered the end of Ashleigh Barty's Australian Open - "the Barty Party is over", as the local TV reported - and now it features Novak Djokovic going through his pre-match routine in the tunnel by Margaret Court Arena. It involves two tennis balls, a wall, and super-fast reflexes.
Image source, BBC Sport
BBC Radio 5 live sports extra
There's commentary available of Angelique Kerber's match against Maria Sharapova over on Radio 5 live sports extra, as well as updates from all the action around the courts in Melbourne.
You can listen in by using the player at the top of this page. Go go go!
There's plenty happening in the night sessions across Melbourne today.
Angelique Kerber will take on Maria Sharapova in their third round tie shortly, while Novak Djokovic will start his tie against Albert Ramos-Vinolas on Margaret Court Arena.
Andy Murray has been staving off jet lag with a Twitter Q&A, external in the early hours of the morning.
Questions ranged from the weird to the wonderful - my favourite was when he was asked to describe Juan Martin del Potro in three words.
He opted for "BFG."
Image source, Getty ImagesAndy Murray gives the BFG a hug
If you'd like a visual summary of how Alexander Zverev's third round match against Hyeon Chung went, well...
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Piers Newbery
BBC Sport at Melbourne Park
There has been no talk of extreme heat policies or ambient temperature today - as we head into the evening it's a pleasant 23C, and there is even talk of some rain this evening and tomorrow.
Fortunately we are blessed with enough cover (Rod Laver, Margaret Court and Hisense Arenas each have a roof) to guarantee the singles matches will continue unaffected by this stage.
Image source, BBC Tennis*Del Potro 2-2 Berdych
There's two former top five players in action on the Hisense Arena.
Juan Martin del Potro is facing off against Tomas Berdych in the battle of the giraffes. The two have exchanged breaks in the opening few games, and it's back on serve.
Well...
Image source, EPAFirst on Rod Laver Arena, 2016 champion Angelique Kerber takes on five-time Grand Slam champ Maria Sharapova.
They're followed by defending men's champion Roger Federer, who has 29th seed Richard Gasquet to contend with.
Over on Margaret Court, Novak Djokovic continues his return from injury with his third round match against Albert Ramos-Vinolas, before Agnieszka Radwanska takes on qualifier Su-Wei Hsieh.
And Juan Martin del Potro is also in action today - he's currently in action, taking on Tomas Berdych.
Image source, EPAReady for some of this?
Image source, Getty Images