There's half a chance here for Evans. Medvedev clips long for 15-30.

Naomi Broady
British player on BBC Radio 5 Live Sports Extra

It is a seriously tough ask, but Evo loves a challenge. He's one of the most self-confident players and will always back himself. He has a confidence that you just can't teach. He's had it since we were in juniors together.

Back on track! That's a great hold from Evans from two break points down. He keeps his focus and draws the errors from Medvedev to stay in touch in the second set. Nicely done.

Image source, Getty Images

Great fight from Evans. The Briton rescues the situation with another serve and volley. Deuce.

Medvedev applies the pressure once again with a volley for 0-30 and, after he narrowly misses with a lob, an error from Evans hands another two break points the Russian's way.

The world number two is barely putting a shot wrong. Medvedev holds to 15 and takes charge of set two.

Uh-oh. A horrible opening game for Evans.

The British number one is broken to love after a couple of cheap unforced errors. This is a big ask from here.

Medvedev is still yet to drop a set at the 2021 US Open.

In fact, he's not lost more than four games in a single set so far.

Dan Evans gets the second set under way.

Gigi Salmon
BBC Radio 5 Live tennis commentator

That was a very, very clean first set of tennis from Medvedev.

Quality serving from Daniil Medvedev.

He takes the first set with a hold to love.

Medvedev hammers an ace for 30-0 and brings up three more set points as Evans misses.

And that's a very good hold from Evans under real pressure.

He makes Medvedev serve for the first set.

Set point saved!

Another expertly taken smash from Evans keeps him alive.

Evans gives Medvedev a thumbs up as the world number two whips a passing shot across the Briton at the net.

Set point.

Dan Evans appears to be cruising to a hold as a backhand takes him to 40-0, but Medvedev comes back. A couple of fine backhand winners from the Russian, who's on high alert for Evans' surges towards the net, help him to deuce...

Everybody stop! There's a bug on the court. A ball boy tries to help it out, but the stubborn little thing escapes and decides to watch the action up close from the baseline. No fear.

When the tennis resumes, a wonderful, hooked winner gets Dan Evans up and running.

Evans is running out of games to play with in this first set.

That's superb though. A forehand winner moves the Briton back in front at 15-30. But it's not enough. Medvedev keeps calm and flips the game on its head for a 5-2 lead with some effortless play.

Image source, Getty Images

The serve and volley works a treat again for Dan Evans, who draws level once more at 30-30.

The Briton manages to dig out a return at the net to ease the pressure, before taking the game.

It's a case of get this game wrapped up and see if you can push Medvedev's serve for Evans here, as the opening set begins to slip away.

The world number two is getting to pretty much everything, but Evans eventually forces him into the mistake for 15-15.

It's into the net from Evans and Medvedev secures another hold to take a 4-1 lead in the opening set.