Jonathan Jurejko
BBC Sport senior tennis reporter at Flushing Meadows

With both players having the capacity to fluctuate wildly, it felt this was always going to be a rollercoaster.

Already there have been more ups and down then a day out at Coney Island.

Someone pass the candy floss.

Sabalenka has lost her serve four times over the past fortnight.

She has already lost it twice in this match. Can she hold onto it here?

Did I jinx it with my previous post? Oops.

Sabalenka breaks at the first opportunity as another mistake flies off the Anisimova racquet.

Already the shifts of momentum in this match have been staggering.

The errors start to creep in for Anisimova and Sabalenka has three break-back points.

This could not be more night and day from Wimbledon final Anisimova to US Open final Anisimova.

Playing with freedom, confidence and focus.

Annabel Croft
Former British number one on BBC Radio 5 Sports Extra and BBC Sounds

It is going to take enormous strength of character from Sabalenka. The crowd are going to be cheering her every error. They are after blood.

Everything is singing out of the strings of Anisimova. She is totally on fire and inspired. She is playing with freedom.

So impressive from Anisimova. She takes the break again meaning she's won the last three games and nudges ahead in this final.

Anisimova pounces on Sabalenka's second serve and to be honest she's smashing Sabalenka off the court at the moment.

Annabel Croft
Former British number one on BBC Radio 5 Sports Extra and BBC Sounds

Re-watching the Wimbledon final is such a brave thing to do for Anisimova. But it is a good thing to do, to see where things went wrong.

That was as big a backhand as we have ever seen from Sabalenka but it comes to no applause. She will have to accept that the crowd is not on her side tonight.

We're four games and just over 20 minutes into this final and already Sabalenka is starting to get a touch frustrated.

Pure power is enough at the moment for Anisimova and she gets out to 0-30 on the Sablenka serve just by whacking the ball through the middle of the court.

Sabalenka fumes as she misses the ball but complains that it hit the net. There was no call from the umpire, though so we go on.

Anisimova takes the hold and it's greeted by a huge roar from the New York crowd. We are firmly back on serve in this final.

Ryan Harrison
Former American tennis player on BBC Radio 5 Sports Extra and BBC Sounds

There was not great shot selections there from Sabalenka. Anisimova is clearly struggling to get her rhythm - that is not the best choice to use the drop shot.

Annabel Croft
Former British number one on BBC Radio 5 Sports Extra and BBC Sounds

Great footwork and shot from Anisimova. She plants her front foot and crushes the ball along the line.

I have goosebumps.

Jonathan Jurejko
BBC Sport senior tennis reporter at Flushing Meadows

Amanda Anisimova isn't planning to rein in her ball-bashing.

You can see the logic - a) that's her game and b) she wants to get under Sabalenka's skin.

There are a few concerning murmurs when Anisimova does not quite find her mark.

Patience, people.

Once Anisimova finds more rhythm she claws back the back and sends the New York crowd - featuring Friends star Courtney Cox, among others - wild.

Sabalenka is visibly struggling with the sheer power and pace coming off Anisimova's racquet but she can't. Every shot is met with a huge grunt and a crouched position.

Eventually Anisimova pumps her forehand straight through court and Sabalenka can't get there.

Game on.

Well, there might've been a couple of signs of stress from Anisimova as Sabalenka raced out to 30-0 on serve but Anisimova wins the next three points to bring up a break point.

She'll be a lot less stressed if she can get this over the line.

Ryan Harrison
Former American tennis player on BBC Radio 5 Sports Extra and BBC Sounds

Anisimova is visibly distracted here. There are signs of stress. She is looking at her box.

She needs to settle down - that is not a good sign.

Annabel Croft
Former British number one on BBC Radio 5 Sports Extra and BBC Sounds

Anisimova's serve is one of the biggest serves on the women's tour. The line of her shoulder follows the ball to perfection.

This is such high quality tennis already- we are in for a terrific final.

Both players do not like to be too far behind the baseline - they like to get their strike in and use their legs to absorb the pace.

Another really tough service game but this time Sabalenka takes her chance and gets the break as Anisimova goes long.

Ryan Harrison
Former American tennis player on BBC Radio 5 Sports Extra and BBC Sounds

It is easy to forget how big Anisimova can return. That puts the pressure on your second serve and makes you go too much.

Sabalenka may not be able to go toe-to-toe on this power. I am backing Anisimova on that front.