Meanwhile, Judy Murray is continuing to discuss who might win this thing.

Norrie doesn't look too fazed by being a break down to a seeded player at a Grand Slam.

A string of speedy serves gives him a straightforward hold and keeps him in this set.

That could prove to be a crucial one in this first set as Norrie can't take his chance to break and gives Schwartzman the hold when his return swings wide.

Nope. Norrie's racquet gives up on him and the ball loops into the air and out of court.

But then the Brit sends Schwartzman sprinting the back of the court, then scurrying forward for a drop shot and the Argentine can't get the ball over the net.

Another break point, which is immediately saved as Norrie's return goes into the net. We continue.

"Come on!" shouts Norrie as Schwartzman's backhand goes into the net. Another chance to break...

A lovely backhand volley from Schwartzman shuts down the first break point. I'd go as far as to say that was the best shot of the match so far.

Norrie battles from the baseline, but his backhand goes astray and it's deuce.

Speaking of keeping concentration, Schwartzman seems to have had a momentary lapse. His forehand goes wide and Norrie is in with a chance of yet another break at 0-30.

Norrie is caught wrong-footed and scoops his backhand wide, but Schwartzman double faults and the Brit has two break points.

Judy Murray
Tennis coach on BBC Radio 5 Live Sports Extra

Keeping your concentration in a very weird secure bubble with no crowd, no energy to feed off - you'll need to be very strong mentally to win this tournament.

There are so many different factors in predicting what's going to happen, you'll be crazy to do so.

With Roger Federer and Rafael Nadal absent this year because of injury and Covid concerns respectively, is it a prime chance for someone like Schwartzman to claim a Grand Slam victory?

Judy Murray says it's far too early to think like that. And who would argue with Judy Murray?

This must be the longest game of the match so far and Norrie might be feeling it as his forehand lands on the wrong side of the line.

Schwartzman has a break point and another unforced error from Norrie - his backhand lands out - puts the Argentine ahead again.

*Denotes next server

Norrie looks like he's on his way to a straightforward hold but a lengthy rally turns the table as Schwartzman goes on the attack and puts a forehand winner into the bottom left corner. 30-30.

An ace from Norrie steadies the ship, but a mishit backhand puts him under pressure again. Deuce.

Amazing grit from Norrie!

Schwartzman lands a backhand long and we're level again.

Norrie comes out firing and takes the first point in the game after a decent return.

A backhand down the line puts the Briton 30-15 up and a hammer of a forehand gives him a chance to break back.

Uh oh...

You can't offer chances like that to the number nine seed. Schwartzman darts forward and slams a forehand into the bottom-right corner, out of Norrie's reach.

The door is ajar again... Break point Schwartzman.

It doesn't feel like the first round of a Grand Slam on the ghostly silent court five, with just a few coaches and physios sat around the court.

Both players are bringing their best level though. Schwartzman gets a half chance at 15-30, but a speedy serve from Norrie closes the door. 30-30.

A flurry of powerful forehands from Norrie gets Schwartzman on the run. The Argentine finds himself on the back foot and his forehand lands wide to bring up 30-30.

The Brit can't push on from there though and Schwartzman quickly closes the game out as Norrie's forehand hits the net.

Diego Schwartzman is only three years older than Cameron Norrie, but he has a richer pedigree than his British counterpart.

Norrie, 25, only turned pro three years ago and is looking to reach the third round of a Grand Slam for the first time this week.

Schwartzman has had experience of reaching the second week of a major, particularly at Flushing Meadows where he has twice reached the quarter-finals. Last year he was beaten by eventual champion Rafa Nadal at this stage.

A good start for Norrie against the ninth seed, but he's got a pretty big task on his hands today.

Let's take a quick look at how these two compare.

Norrie comes to the net and snatches a few lobs out of the air, winning the point with one final smash to bring up 30-30.

Schwartzman slices one backhand into the net, then another and it's a good hold for the lower-ranked Norrie.