Amanda Anisimova gets the break.

The American will serve for the set.

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Remarkable spirit from Amanda Anisimova from 40-0 down.

Naomi Osaka races into a 40-0 lead but Amanda Anisimova isn't letting the game pass by that easily.

A booming forehand from the American is returned into the net for 40-30 and she forces over a winner for deuce.

Amanda Anisimova puts up one of the most controlled service games of the match - holding to 15.

Naomi Osaka gets to 40-15 with her third ace of this set - that's as many as Amanda Anisimova has recorded in the match.

Osaka nudges back in front on the scoreboard when Anisimova's backhand strays long.

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Naomi Osaka lets out a huge scream.

The two-time US Open champion has broken back at the first attempt.

I may have jinxed Amanda Anisimova.

The American twice loses the ball as she throws it up and has to reset her serve before double-faulting to trail 0-30.

She battles back to 30-30 but the net cord works against her once again - sending the ball wide.

Now, can Amanda Anisimova do what she was unable to earlier in this set and consolidate that break?

Naomi Osaka can't keep her forehand in and Amanda Anisimova takes control of the second set.

Oh no!

Amanda Anisimova has a slow second serve to attack but her return clips the net cord and loops agonisingly long for deuce. So frustrating for the eighth seed.

Anisimova gets another look at break point though.

The drop shot is creeping into Amanda Anisimova's game now and it's working nicely.

Naomi Osaka cuts a frustrated figure when a baseline return goes long to hand over break point.

Amanda Anisimova comes through the longest rally of the match - 13 shots - finishing with a cross-court winner from the net for advantage but a slip on the baseline takes it back to deuce.

Anisimova gets back to advantage and her big serve is returned long for the hold.

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Amanda Anisimova might have just played the first drop shot of the match... and it's a beauty.

Maybe that might spur her on to use it more regularly?

The American can't quite believe that she has gone long on a backhand - allowing Naomi Osaka to deuce - and turns to vent her frustration in the direction of her coach.

Naomi Osaka is closing in on the first hold of the second set at 40-30 but gets her angles wrong with a forehand and it's deuce.

A 114mph ace gets Osaka to advantage and the hold is sealed with a winner down the line.

And Naomi Osaka gets it.

In the words of Liam Gallagher... "as you were."

It seems the chaotic theme of the first set is bleeding into the second.

Amanda Anisimova puts long and Naomi Osaka has the chance to break back immediately.

Amanda Anisimova is down on one knee to swipe a forehand winner to get the break.

That's one way to hit back.

The time away from the bright lights works wonders for Amanda Anisimova.

A couple of shots at break point already.

A couple of breaks apiece in that opening set and momentum shifting one way then the other before ultimately being decided on a tie-break.

Amanda Anisimova took a few moments off court to gather her thoughts before the second set.

There's very little in this.

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Naomi Osaka gets it done.

Another unforced error from Amanda Anisimova - her 23rd of the match - hands over the opening set.