Andy's desperate to see his fellow Briton in action...

For what it's worth, the win predictor has Emma Raducanu at a 93% chance of success.

Stephens showed in that last game, which lasted more than 10 minutes, that she is going to fight for everything though.

Raducanu is having to go on the defensive and Stephens sent a forehand long when the Briton was at the net.

That was on break point four, but break point five is just around the corner.

And this time the American gets there, courtesy of a double fault from Raducanu.

Raducanu a set up, Stephens, having been bageled in set one, has a break at the start of the second.

Stephens has been unable to convert three break-point chances, but now, after nine minutes of action in this game, has a fourth opportunity.

Jonathan Jurejko
BBC Sport at Melbourne Park

The crowd are stretching their vocal cords for both players. A rare winner from Stephens is greeted with gusto. Nobody wants their night out on Court to end early doors.

Stephens sent a tame backhand halfway up the net on her first break-point chance of the match and followed that up by sending a looping forehand long with her second opportunity.

After a brilliant lengthy rally Stephens got a bit lucky with the ball flicking off the tape before brutally dispatching a two-handed backhand into the corner.

Deuce, for the third time, and it is the longest game of the match by miles. Eight minutes this one, the whole first set only lasted 17.

Stephens collected just four points in six games in set one, she has already picked up three in the first game of the second set and is hoping to convert this break-point chance following a Raducanu double fault.

Laura Robson
Former British number one on BBC Radio 5 Live

You know what I'm feeling perky after that set. I've had 17 minutes worth of coffee.

Stephens just picked up four points in that opening set. One to wipe out from the memory banks and pretend the match starts now.

Laura Robson
Former British number one on BBC Radio 5 Live

I don't know what to say. I'm very pleasantly surprised with how this match is going. I think Sloane is showing a bit of lack of practice. It doesn't look like she's spent much time [on the court] in the off season.

Then again she could have spent loads of time but it's hard to tell.

Who could've predicted this start? Sloane Stephens, trying to fend off two break points, sends one down the line but it is out and that's the first set for Raducanu.

Seventeen minutes is all it took, and she's halfway to round two.

Absolutely brilliant from 19-year-old Raducanu.

A sliced backhand from Stephens goes into the net and then Raducanu, who has the first set in her sights, produces a brilliant backhand down the line.

James Morbey: Emma absolutely flying here!

Jonathan Jurejko
BBC Sport at Melbourne Park

Last week in Sydney, Raducanu won one game against Elena Rybakina and lost in 55 minutes.

What a difference a week makes.

Not sure Raducanu is going to spend even that long on court today - for wildly different reasons.

Russell Fuller
Tennis correspondent in Melbourne

She is absolutely flying in this first match. Different city but the same Raducanu so far [from the US Open].

Everything is falling into place so far, Stephens has won just three points so far.

Stephens has won three points, Raducanu 19.

Make that 20, with a lightning fast hold to love and in a blink of an eye it's 5-0 to Raducanu, one game away from the opening set.

Stunning from the 19-year-old.

Laura Robson
Former British number one on BBC Radio 5 Live

That's a fantastic rally rom Raducanu, she really mixed up the height of the ball nicely. You have to be smart enough to use the wind when you can.

It's 4-0! Raducanu gets her angles spot on and finds the tramline with a brilliant two-handed backhand from deep and that is a double break for the Briton.

Raducanu couldn't have dreamed of this start. She now has two chances for a double break of serve after a lovely passing shot.

Laura Robson
Former British number one on BBC Radio 5 Live

Sloane Stephens isn't getting much pace on her ground strokes. Raducanu is all over them.