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
Image source, APRoger Federer....THROUGH.
Novak Djokovic...THROUGH.
Serena Williams....THROUGH.
Heather Watson....OUT
Kyle Edmund....OUT
That's where we're at after day one of the Australian Open. Catch up all the latest from Melbourne by heading over to our tennis page.
And make sure you return tomorrow (in the very early hours if you're in the UK) for another feast of action. See you then!
Konta v V Williams (Tues, approx 02:00 GMT)
Johanna Konta, who meets Venus Williams on Rod Laver Arena, says she will not allow sentiment to affect her performance against the seven-time Grand Slam winner.
She played 34-year-old Williams for the first time at Wuhan in October, exchanging hugs in the locker room with the American after her 6-4 3-6 7-5 quarter-final defeat.
"The experience will be different," said the world number 47.
"It was the first time I played her and she was one of the players I grew up watching when I was younger, so it was definitely a different experience to where I'm at now."
Konta v V Williams (Tues, approx 02:00 GMT)
Other than Murray, all British eyes will be on Johanna Konta tomorrow.
The British number one enjoyed a memorable 2015, climbing over 100 places to 47th in the world rankings.
And she faces childhood heroine Venus Williams in the first round of the women's singles of 2016's first Slam.
Bedene v Johnson (Tues, approx 04:30 GMT)
Britain's final male contender is Aljaz Bedene, who follows Dan Evans on court three. The Slovenian-born world number 49 meets American Steve Johnson.
"I know Johnson plays well," says Bedene. "He hasn't started the season that good, but he has a great serve, a great forehand. But I know his weaknesses and I know that if I play well then I've got a good chance."
Lopez v Evans (Tues, 02:00 GMT)
As well as Andy Murray, there are also three other British hopes playing tomorrow.
He is joined in the men's draw by Dan Evans, who was 772 in the world rankings as recently as May. But the 25-year-old from Birmingham has regained his form, beating Bjorn Fratangelo 7-5 4-6 6-0 in the final round of qualifying to book his spot at Melbourne Park.
He meets Spanish 18th-seed Feliciano Lopez on court three at about 02:00 GMT.
Murray v Zverev (Tues, approx 02:00 GMT)
Muzza should breeze past this German kid, shouldn't he?! Probably, but Alexander Zverev is classed as one of the rising stars of the men's game.
And the Scot believes 18-year-old Zverev will cause him "a few issues" in the Australian Open first round.
Murray, who beat him 6-3 6-4 in the Hopman Cup last week, says the 6ft 6in-tall youngster is an ever-improving player.
"He's still filling out his physique but he's got a very good game and he serves well," said Murray.
"For a big guy, he moves pretty well too. He's obviously improving all the time, so it will be a tough match."
There is good news for British tennis fans - there's an extremely good chance of one of your favourites winning at Melbourne Park tomorrow.
Some guy called Andy Murray? The second seed plays German teenager Alexander Zverev about 02:00 GMT on Tuesday - set your alarm clocks. Or don't go to bed...
Image source, EPA#bbctennis
Joel Newnham: Poor start for British tennis on first day of Australian Open praying for a reversal of fortune on day two.
Just tuning in? I'm afraid there's some bad news (from a British perspective). Not only has Heather Watson bitten the Melbourne dust - so too has Kyle Edmund.
The 21-year-old Yorkshireman was hampered by cramp as he lost in five sets to world number 81 Damir Dzumhur on day one.
He led by a set in hot conditions but the problem with his left leg helped Dzumhur fight back for a 1-6 7-6 (7-4) 4-6 6-3 6-1 win.
Watson 7-6 (7-4) 5-7 5-7 Babos
Leon Smith
Great Britain Davis Cup captain BBC Radio 5 live sports extra
"Babos is the more aggressive of the two players, and we saw how the fine margins can make a difference. She got the down-the-line winners when it mattered. Heather fought so hard to get back into the match, but that one is going to hurt a lot. It's another one that has slipped away when she was in a winning position."
Watson 7-6 (7-4) 5-7 5-7 Babos
Heartbreak for Heather Watson! Timea Babos has the bit between her teeth, ramping up the pressure as the British number two crumbles.
The Hungarian finishes the job with a smart backhand winner, shrieking in undulated pleasure as she moves into round two.
Watson looks drained as she quickly disappears into the locker room. Where she'll probably smash a racquet or two and possibly kick a bin in frustration. (Well that's what I'd do.)
Watson 7-6 (7-4) 5-7 5-6 Babos*
Nervy times. Heather Watson looks in control as she digs deep to lead 30-15.
But an inside out forehand winner from Babos flashes across the court like a shooting star...30-30. And the Hungarian cracks another winner to leave Watson stunned...match point.
*Watson 7-6 (7-4) 5-7 5-6 Babos
Anyone dare to guess which way this match is going to go? Nope, me neither.
Babos starts to serve and volley like Stefan Edberg, regaining her composure to hold her serve to love. Four wonderfully-crafted points from the Hungarian there.
Watson 7-6 (7-4) 5-7 5-5 Babos*
Perhaps Heather Watson can hear those words of wisdom from Leon Smith. Because she does rediscover her service game, forcing Timea Babos into a couple of errors to lead 30-0.
Babos continues to pepper the baseline with deep forehands, but Watson has an answer to everything. She moves 40-15 ahead and then smashes down a sizzling ace - her eighth of the match - to level the deciding set.
*Watson 7-6 (7-4) 5-7 4-5 Babos
Leon Smith
Great Britain Davis Cup captain on BBC Radio 5 live
"Heather has to get more of her first serves in. She's getting caught on her second serve too often. She doesn't have to get an ace; she just has to make Babos work."
*Watson 7-6 (7-4) 5-7 4-5 Babos
Watson shrugs off that error to nick a 40-30 lead - and a break point.
Babos smashes down a thunderous serve which is called out. Babos shrieks. She thinks it is in. She challenges - and is proved right. It dusted the tiniest part of the T line.
Watson is not deterred, however, winning another chance to keep this match alive. And she gets it! Babos steers a forehand into the tramlines and on we go...
Watson 7-6 (7-4) 5-7 3-5 Babos*
This is tense. Good start for Heather Watson, who leads 15-0 and then goes 30-15 ahead.
The Briton is dominating the rallies, pressing the Hungarian back, but then blows a great chance by palming a forehand into the net....
Watson 7-6 (7-4) 5-7 3-5 Babos*
Leon Smith
Great Britain Davis Cup captain on BBC Radio 5 live sports extra
"It's so tough when you've been chasing the match for so long, to go 0-15 on serve. It started on the first point when she pulled a sitting forehand an inch wide, and the pressure was on from there."
Watson 7-6 (7-4) 5-7 3-5 Babos*
This match has more twists and turns than a rollercoaster.
Watson tumbles 30-0 down...make that 40-0. Three break points for Babos...she needs just one.
The Briton tenses up, clubbing a routine forehand too long. Now the Hungarian serves for the match...
*Watson 7-6 (7-4) 5-7 3-4 Babos
Leon Smith
Great Britain Davis Cup captain on BBC Radio 5 live sports extra
"What an amazing response from Heather. She bossed most of the points and made Babos do the work. She was so gutsy and brave with her play."