Russell Fuller
BBC tennis correspondent at Flushing Meadows

I wonder if this is the game we're going to be talking about after the match.

Philip West: It’s almost sacrilege to say it, but I believe that Serena Williams now has a mental block in Grand Slam finals. Where once she intimidated opponents, the opponents are now intimidating her.

Sulaimon Adelekan: Serena Williams is trying problem moving due to the fact that she has aged, Bianca Andreescu is dealing with the pace of the game and she is much younger.

Jeff Tarango
Former professional tennis player on BBC Radio 5 Live

I'm just getting worried for Serena, I have to be honest. Andreescu is not nervous, she sees this as a huge opportunity.

Williams saves again, and this time, it's the American who gets the next advantage.

And what a shot to hold. She flies a fist into the air. That was such an important hold for her.

Image source, Getty Images

Jeff Tarango
Former professional tennis player on BBC Radio 5 Live

I've never seen a fist-pump after a challenge before but Serena's pulled it off.

Williams sends an ace down the T, it's ruled in but Andreescu challenges. Hawk Eye proves it in by the SMALLEST margin. Merely a bit of fluff on the ball.

Deuce again before another fine winner from Andreescu, a cross-court forehand which Williams barely attempts to meet.

Fifth break point in this game.

Nope, not this time either. Williams saves it again and back to deuce we go.

A brilliant exchange of shots but then Williams slams into the net.

Break point AGAIN.

Image source, EPA

Not this time, again...

A shake of the heads from Andreescu as she misses the opportunity to go a double break up.

But a brilliant winner from the Canadian and it's her third break point of this game.

Image source, Getty Images

Not this time. Williams brings up deuce with another ace down the middle, but then nets another backhand.

Break point again.

Andreescu can't deal with Williams' opening two serves. She pulls a point back as Williams sends one into the net, and then another as the American shoots long.

Williams then flips a backhand wide and Andreescu has another break point.

Russell Fuller
BBC tennis correspondent at Flushing Meadows

At the moment, this is Serena's worst nightmare. Her opponent isn't fazed in the slightest.

Andreescu races into a 30-0 lead but Williams responds with another cracking winner down the line. Perfectly placed.

An error from Andreescu and Williams is level, before the Canadian slams her second ace of the night down the T.

She holds. No sign of nerves at all in her first Grand Slam final.

Image source, Getty Images

Jonathan Jurejko
BBC Sport at Flushing Meadows

With the Canadian border a short trip (well, for North America) up the road, it is not surprising that Andreescu has plenty of backing here as well.

Earlier a group of maple-leaf T-shirt wearing Canadians were giving a rallying cry of support for the benefit of television.

Image source, BBC Sport

Naomi Broady
British player on Radio 5 Live Sports Extra

Andreescu deals with pace so well. She's just matching Serena here.

An aggressive first point for Williams before Andreescu slams into the net from close range, after the American had delivered a return on the stretch at the baseline.

Andreescu bounces back before Williams delivers another ace before serving out the game.

Image source, Reuters

Jonty: Serena’s power is not enough any more...

Dennis Ethan: I love this energy from Bianca Andreescu, just going on with her game and very composed

An easy 40-15 hold for Andreescu. Polite applause.

Image source, Getty Images

Jeff Tarango
Former professional tennis player on BBC Radio 5 live sports extra

Williams plays that adrenaline well and she loves to put it right in the face of her opponent.

Big cheers inside Arthur Ashe as the Duchess of Sussex, sitting next to Williams' mum, is shown on the big screen.

Image source, Getty Images

Jonathan Jurejko
BBC Sport at Flushing Meadows

That's the first time Williams has been broken since the first set of her fourth-round match against Petra Martic. In fact, it is the first time she has faced a break point since then.

Image source, Getty