Heather Watson loses in three sets to Timea Babos
Watson 7-6 (7-4) 5-7 5-7 Babos
Federer, Kyrgios & Sharapova win in straight sets
Serena Williams through after tense win
Kyle Edmund suffers cramp in five-set loss
Wozniacki 6-1 6-7 (3-7) 4-6 Putintseva
A delighted Yulia Putintseva throws her racquet to the blue acrylic and sinks to her knees in celebration - she has just knocked out Caroline Wozniacki!
The Kazakh, who is ranked 76th in the world, is through after the former world number one plants a forehand into the tape after an extraordinary long rally.
Wozzy was struggling with injury during that final set, mind.
Wozniacki 6-1 6-7 (3-7) 4-5 Putintseva
We've got a bit of live business to deal with - and there could be an early big-name scalp.
Former world number one Caroline Wozniacki must break the serve of Yulia Putintseva to avoid a first-round exit...
Davis Cup player Dom Inglot: "The message needs to be put out consistently that if you get caught you get a life ban. There should be no doubt about that."
A polite reminder that you can tune into 5 live Sports Extra's Tennis Breakfast right now.
Twiddle your tuner on the old wireless or, if you prefer, click the Live Coverage tab on this page.
British doubles player Dom Inglot and American tennis journalist Christopher Clarey are talking about the match-fixing allegations - and the on-court action - right now with Gigi Salmon.
British doubles player Dom Inglot has been speaking about the latest match-fixing allegations in tennis, insisting that he has never been approached to throw matches.
"I've never been approached to fix matches and I don't know anyone who has personally," he told BBC Radio 5 live Sports Extra's Tennis Breakfast programme.
"But the report is very worrying and everyone in tennis, including the players wants to believe in this sport and that it is real.
"The governing bodies involved would be silly not to jump on this and make sure it is clean."
However, the on-court action is not what is grabbing the tennis headlines today.
That's because secret files exposing evidence of widespread suspected match-fixing at the top level of world tennis, including at Wimbledon, have been revealed by the BBC and BuzzFeed News.
The Tennis Integrity Unit , external- set up to police the sport - said it had a zero-tolerance approach to betting-related corruption.
The four tennis governing bodies - ATP, WTA, Grand Slam Board, ITF - have rejected suggestions that evidence of match- fixing has been suppressed.
As well as Heather Watson's opening match, a couple of names you just might have heard of are also going to pounding the blue acrylic of Melbourne Park over the next few hours...
Both of those matches start on the show courts at 08:00 GMT.
Watson v Babos (approx 08:00 GMT)
That's right, British number two Heather Watson has enlisted the help of Judy Murray for the first Grand Slam of the year.
Watson is being coached by her Fed Cup captain after she split last month with Argentine coach Diego Veronelli, who wanted to spend more time with his family.
And Watto kicks off her Australian Open campaign against Hungary's Timea Babos in about an hour's time.
Murrays here, Murrays there, Murrays everywhere. A day barely goes by at a Grand Slam these days without Andy, Jamie or Judy popping up on our screens.
Today it is the matriach of the Murray family who we will see plenty of, with Judy getting ready to be sat in the Melbourne Park stands.
Why? Because Mrs Murray (or should that be Ms Murray?!) will be watching from Heather Watson's box...
Image source, Getty Images