David Law
BBC Radio 5 Live Sports Extra tennis commentator

Normally a crowd would react to a break of serve like that but there was nothing other than a Norrie roar.

Of course, there will be no fans inside Flushing Meadows over the next fortnight.

So will it change the behaviour of the players without the crowd to play up to? Less racquet smashing and fewer finger wags at the chair umpire?

A leading UK sports psychologist believes the lack of supporters is likely to see fewer controversial outbursts.

"If you do see any, they are more likely to be pre-planned because fans usually fuel these acts," says Professor Andy Lane, who has worked with elite athletes across various sports for over 30 years.

Read more here.

Image source, Getty Images

Given that that was the most passion we've seen from either player so far, it's a good chance to talk about behaviour on court.

One sports psychologist thinks it could change given there are no fans at Flushing Meadows this year.

Norrie lets out a long cry as Schwartzman loops the ball over his head and out. He finally gets his break.

It looks promising as Schwartzman faults his first serve, but the Argentine lands a speedy second serve and Norrie's return lands long. Break point saved.

Norrie can't waste opportunities like that against the ninth seed.

He gets another as Schwartzman hits the ball long.

Norrie's backhand goes into the net, but a couple of points later Schwartzman returns the favour. Another break point.

It looks like this match can only end one way but Norrie is making the ninth seed work for it.

The Brit goes 30-0 up on Schwartzman's serve, but the Argentine quickly levels things.

But wait, Schwartzman's forehand lands wide and Norrie has a chance to break back.

Schwartzman's return lands near the baseline and Norrie has to scuttle back, leaving him only able to slice a backhand into the net. A fifth break point for Schwartzman.

Double fault and it's all over.

Oops. A double fault brings Norrie back to deuce.

Schwartzman pushes him back to the baseline, Norrie is wrong-footed and twists his forehand wide. Another break point.

It's immediately saved with an excellent serve.

Schwartzman repeats the mistake and Norrie has saved the third break point. He treats himself to a fist pump and so he should.

Norrie saves the first break point as his serve just lands in.

The Briton keeps his cool in a lengthy rally and Schwartzman is the first to crack, looping the ball high into the air and long. Two break points saved.

Norrie comes forward on the attack but it's a bit half-hearted and doesn't quite work out for him. Schwartzman sees straight through him and forces the Brit to tap his volley long.

The Argentine hits a forehand winner down the line to go 30-0 up and Norrie's backhand lands long. Three break points for Schwartzman.

Naomi Broady
British player on BBC Radio 5 Live Sports Extra

Schwartzman is so quick around the court he puts you in difficult conditions and you try to do too much with the ball.

Norrie continues to show great nerve as he battles to go 30-15 up but Schwartzman gets him on the back foot again and closes out the game with a gorgeous cross-court backhand volley. He's quite good at those volleys.

*Denotes next server

Judy Murray
Tennis coach on BBC Radio 5 Live Sports Extra

A lot of the younger players don't have that fear factor when they face her, there will be respect but not the fear there once was.

I would love to see her get the 24th title, but time is running out and maybe that's putting pressure on her because of the limited time she has to compete at this level.

The life of a tennis pro is much tougher when you have a family.

I am in her corner, I can never really see past her and hope she can do it and go out on a high.

Turning our focus away from the bad news for Brits on court five momentarily, will Serena Williams win a 24th Grand Slam title?

Here's what Judy Murray thinks.

Without much fanfare on the almost empty court, Schwartzman gets the break and seals the set.

Maybe inevitable for Norrie against the ninth seed, but still not much fun.

The news continues to worsen for Norrie. His forehand loops wide, bringing up 15-30. Schwartzman is a couple of points away from taking this set.

Norrie gets things back on track, but only momentarily as his backhand goes into the net and he gives Schwartzman set point.

After three breaks in a row it looks like both players are getting into the swing of things on their service game.

Not great news for Norrie, but Schwartzman is very much in the groove as he holds to love.

Judy Murray
Tennis coach on BBC Radio 5 Live Sports Extra

The pandemic has affected many people's decision to enter and it is a weakened field so there will probably be an asterisk against the winner.

There's a world crisis so I think there has to be!