Crash.

Winner.

Osaka holds and Coco Gauff will serve for the win.

Another angry swipe from Naomi Osaka - she's going for broke now - and she's got game point.

A furious, frustrated drive from Naomi Osaka, leaping and slamming a forehand beyond Coco Gauff for a 30-0 lead.

Osaka whirls her backhand into the net to get Gauff on the board before dragging a forehand down too low.

30-30.

Can Naomi Osaka make Coco Gauff serve it out?

Coco Gauff takes the pace off her second serve and Naomi Osaka overcooks her return to give Gauff a 30-0 lead.

Again, the Osaka backhands lets her down as she aims cross-court and fires it wide, and Gauff takes advantage of an awful drive volley from Osaka to hold to love.

Coco Gauff is a game away from knocking out the defending champion!

The composure Coco Gauff has at such a young age... my word.

Now. Can she back this break up with a hold?

There's no saving the second one, though!

Another backhand miss from Naomi Osaka and Coco Gauff's box are on their feet as she breaks!

That's one break point saved with a ferocious forehand that Coco Gauff cannot return...

Naomi Osaka's having one of those blips again.

Three backhands find the net - the last one by far the worse as she flaps it into the net - and Gauff has a tasty three break points to play with.

Good defence from Coco Gauff, blocking everything Naomi Osaka drills her way, and eventually the Japanese pushes a return just long.

Hello, ace! That hurries Gauff along to a 40-0 lead and she holds as Osaka's backhand goes skew-whiff.

Here's Coco Gauff to serve...

Naomi Osaka coughs up her first double fault but this is better hitting from the Japanese.

She drags Coco Gauff up and down behind the baseline for a 40-15 lead before walloping down an ace to hold.

* denotes next server

Meanwhile, on Margaret Court Arena, Milos Raonic has taken the first set 7-5 over Stefanos Tsitsipas.

You wait five days for a shock and then they all come along at once...

A blistering backhand from Coco Gauff finds the corner of the court for 15-15, drawing a "c'mon!" from the American, and Osaka clubs a forehand long to gift her a point.

Osaka's going too hard here, snatching at her shots, trying to impose herself, and she gifts Gauff a 40-15 lead before steering a divine winner past her opponent.

Shot! Gauff pushes Osaka wider and wider with her backhand and she holds courtesy of an Osaka error.

The changeover might do both players a bit of good - a chance to reset and refocus.

Here's Coco Gauff to serve.

Coco Gauff punches her thigh in frustration as she goes too early on a cross-court backhand and nets.

Naomi Osaka is now back in this, the ball pinging off her racquet, and she races to 40-0 courtesy of some errors from the young American.

Game, Osaka.

Forward comes Coco Gauff - and she skews her volley into the net!

That's much more like it, and we're back on serve.

Oh, ouch.

Coco Gauff trips into her fourth double fault of the match - and second in the game - and Naomi Osaka has another chance to break.

Oh, what a serve!

Pacey, spinney, out wide, and Coco Gauff gets herself back to deuce.

Drop shot from Gauff - and it's chased down nicely by Osaka!

Break back point for the Japanese.