Jonathan Jurejko
BBC Sport at Flushing Meadows

More huge screams as Williams takes her seat. Almost everyone is on their feet and shouting at the top of their voices.

Williams takes a moment to look around and breathe it in. If that isn't inspiring...

Image source, Getty Images

David Law
BBC Radio 5 Live tennis commentator at Flushing Meadows

How on earth is Andreescu expected to play tennis under these circumstances?

Andreescu sits down and puts a towel over her head. What on earth is she thinking right now?

Jonathan Jurejko
BBC Sport at Flushing Meadows

Insane atmosphere. Every point in favour of Williams is greeted with people jumping up to their feet. Every point is met by umpire Alison Hughes pleading for calm.

The noise is incredible. Even Bianca Andreescu has her fingers in her ears...

She breaks at the first time of asking! A massive change of momentum in this final.

Don't go anywhere. It's not over yet!

Arthur Ashe is going MENTAL as Williams goes 30-0 up on Andreescu's serve, and then 40-0.

Three break points. Ridiculous.

David Law
BBC Radio 5 Live tennis commentator at Flushing Meadows

Imagine what Andreescu's mind is going to be going through as she serves for the championship for a second time.

Williams manages to get her first serves in to win the first two points of her service game, before a Andreescu errors brings up 40-0.

After an interruption from the crowd, she goes long on the next point but holds as the ball flops off Andreescu's racquet from a serve.

Naomi Broady
British player on BBC Radio 5 Live

I love when it gets close. I love it when people get tight in tennis.

Image source, AFP

Jonathan Jurejko
BBC Sport at Flushing Meadows

That break is greeted like the nearby Mets have just got a home run.

Fans leap to their feet in celebration. But is it too little too late? The crowd is playing their part, Williams needs to reach their level.

Image source, BBC Sport

Change of ends and a moment for Williams to have a breather. What's she thinking?

Andreescu, as ever, is calm and collected.

David Law
BBC Radio 5 Live tennis commentator at Flushing Meadows

Andreescu's family are going through stress personified right now.

She does it. Williams breaks and she's not down and out yet!

Jeff Tarango
Former professional tennis player on BBC Radio 5 Live

Never say die from the champion. Giving herself another chance, even though it looks pretty bleak.

Oh blimey - from Championship point, now we're at Serena Williams break point.

She goes for the ambitious drop shot but it doesn't clear the net. Her mum can't watch.

Back to deuce. Another nice exchange of shots before Williams sends Andreescu flying with a winner into the corner. Second break point.

Finally we see a decent rally at 30-15 and it ends as Andreescu goes long. Big cheers, even though she challenges it. Nope, well out.

But she eases to championship point. Not this time! Williams saves it to take us to deuce.

Liz Tray: We've seen this exact thing happen three times before. Andreescu is playing wonderfully, as did Kerber, as did Osaka, as did Halep. This mental block is serious. It's painful.

David Law
BBC Radio 5 Live tennis commentator at Flushing Meadows

The crowd cannot believe they are watching Serena Williams at a loss. There have been no controversies like last year, no argument with the umpire, she has simply been outplayed.

And she gets it on the second as Williams skews a forehand wide.

Bianca Andreescu to serve for the US Open title.

This is horrible to watch. Another Williams double fault hands Bianca Andreescu two break points.