Rafa Nadal has found the break in the second set. The ninth seed leads Germany's Florian Mayer 5-4 and has the chance to serve out for a two-set lead.

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Kyle Edmund is playing some confident, composed tennis.

The break looked to be on for Santiago Giraldo after he took a 0-30 lead on Edmund's service game, but the British number two fights back with a couple of big winners to hold.

Jill Craybas
Former world number 39 on BBC Radio 5 live sports extra

Heather Watson served really well and that gives her confidence in the rest of her game.

That's the first set to Heather Watson! She's serving well and a nervy Sam Stosur can't find a response to the 24-year-old Brit at the moment.

Stosur led 2-0 in the first set, but it's Watson - ranked 60 places below the Australian - who draws first blood.

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Rafa Nadal is a set up and it remains on serve in the second set.

He won the Australian Open back in 2009, but with the Spaniard looking great shape again could it be ready to add to that?

He's seeded ninth this year.

David Law
Radio 5 live sports extra commentator in Melbourne

Sam Stosur does have these big dips in confidence during matches and there's always anxiety in the crowd when she plays here. They are willing her to do well, and feel her pain.

Follow live commentary from Radio 5 live sports extra

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Heather Watson has won five games on the spin to completely turn this first-round match on its head.

Sam Stosur doesn't have the best record in Melbourne, and the Australian appears to be feeling the pressure again after winning the opening two games.

Watson looks to be closing in on the opening set...

So after taking the first set comfortably, Kyle Edmund has so far held serve in the second.

The British number two leads Colombia's Santiago Giraldo over on Court 5.

Jill Craybas
Former world number 39 on BBC Radio 5 live sports extra

Heather Watson has got Sam Stosur to a point where she looks a little bit uncomfortable in the last few points and she almost looks as though she is guessing.

Watson's not the biggest or the most powerful hitter, so she has to rely on her movement. But she has to step up and create a weapon for herself. 

When she gets the opportunity to change defence into offence she needs to do that more effectively.

Rafa Nadal won the opening set on the Rod Laver Arena but it remains on serve so far in the second set.

Florian Mayer the man attempting to stop Nadal progressing.

Heather Watson moves back level, she breaks Australian Sam Stosur after a couple of long rallies to pull herself back into this match.

The 24-year-old is down at 81 in the world at the moment, but will be hoping to climb the rankings again this year.

Kyle Edmund works himself a set point against Santiago Giraldo and after a mammoth rally he takes it!

The British number two goes a set up against the world number 91, who sends a backhand wide

Quick work from Edmund too, it took the 22-year-old just half an hour to win the opening set.

Kyle Edmund was 5-1 up and serving for the set on Court 5, but Santiago Giraldo has pulled a break back.

There's been a lot of talk about whether Edmund can last in Melbourne heat, but if he soars through sets at this speed that might not be a problem.

Jill Craybas
Former world number 39 on BBC Radio 5 live sports extra

Sam Stosur's serve is so heavy and the ball bounces so high that if her first-serve percentage remains high, then Heather Watson will find it hard to get into the match.

A double fault from Heather Watson sees Sam Stosur break the Brit in the opening game.

Watson was 30-0 love up in that game, but finds herself an early break down to the Australian former US Open champion.

That tricky first-round task just got a lot more difficult.

Rafa Nadal has taken the first set in his opening match against Germany's Florian Mayer.

The Spaniard, seeded ninth for the tournament, took it 6-3 in just over half an hour.

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Kyle Edmund got off to a cracking start against Santiago Giraldo, breaking the Colombian in his first service game to storm into a three-game lead.

The 22-year-old currently leads 4-1 out on Court 5.

Image source, Getty Images

We've got two Brits in action at the minute with Kyle Edmund facing Santiago Giraldo and Heather Watson taking on Sam Stosur.

We'll keep you updated on how both are getting on, as well as keeping an eye on Rafa Nadal's match against Florian Mayer.

Right then, with Johanna Konta successfully through to the second round we're going to leave it there for the moment.

Don't panic, we'll be back with you when Britain's Heather Watson opens her Australian Open campaign against Samantha Stosur later.

That should be taking place around 04:30/05:00 GMT, just enough time for a quick kip.

Until then, you can keep across all the latest scores from today's action right here.

And here's what Johanna Konta had to say about that first-round win: "It was incredibly tricky, she has the kind of game that can make anyone uncomfortable out there.

"I knew I would have to stay patient and really play myself into the match.

"I definitely love playing here in front of this crowd on these beautiful courts. A lot has happened in the last year but I'm enjoying playing every day."