A sniff for Jacob Fearnley as Martin Landaluce opens his service game with a double fault. However, the world number 65 quickly reasserts his control, dragging the Brit wide on his backhand before sending him scrambling into the opposite corner.

A handy net cord allows Fearnley to rush the net and bring the game back to 40-30 but there's frustration for the 25-year-old as he sends a backhand long on game point.

More frustration - Fearnley stands with his hands on his knees after burying a smash in the base of the net to hand Landaluce two more break points. The Spaniard roars as Fearnley puts another ball into the net.

Landaluce will serve for a place in the second round.

Roman Safiullin nets and then is helpless to reach a forehand winner from Carlos Alcaraz's racquet.

Two match points for the Spaniard.

What a point! Carlos Alcaraz holds his fist up to the sky after ending a brilliant rally with the deftest of drop shots.

That's followed by a not-so-fantastic plant into the net. 15-15.

Pat Cash
Former Wimbledon champion on BBC Radio 5 Live

Safiullin has done what he has to do - at least give himself a chance.

We expected Alcaraz to have a few lapses of concentration but he's actually played pretty good tennis other than one blip in the opening set.

Roman Safiullin whizzes to a 40-0 lead but his momentum is halted brief by a stunning winner down the line by Carlos Alcaraz on the Russian's 114mph second serve.

Safiullin holds on for one more game as he wraps up the hold on the next point.

It couldn't even be called a half chance. Carlos Alcaraz slams the door shut with a lovely sliced volley winner and then a booming ace.

A big service game coming up for Roman Safiullin now.

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Roman Safiullin has to take his chances when they appear to him now, and this could be one of them as he opens up a 15-30 lead on the Spaniard's serve.

Martin Landaluce is in the mood, following a wide serve with a ripping inside-out forehand for 15-0.

It's a comfortable hold to 15 for the Spaniard, who also sends down his 14th ace of the match.

Jacob Fearnley surrenders a 40-0 lead but recovers his composure to hold and stay within touching distance in this fourth set.

Carlos Alcaraz isn't having to hit winners. He's just piling enough pressure on Roman Safiullin to force the Russian into missing.

The second seed claws his way back to 40-30, but Safiullin gets the job done in the end.

Pat Cash
Former Wimbledon champion on BBC Radio 5 Live

This has been the tale of the match. Safiullin gets 15-0 or up and then he serves a double-fault or makes an error.

Time is running out for Roman Safiullin and the Russian looks fed up as he sends a forehand long to gift the hold to Carlos Alcaraz.

Jacob Fearnley failed to convert a break point in game two of the fourth set and now finds himself down a break after double-faulting at 15-all and 30-40.

A long way back.

That's as comfortable as it can get for Roman Safiullin at this point. The Russian overhits a backhand, but he makes sure that's the only look in that Carlos Alcaraz gets in his service game and holds to 15.

Image source, Getty Images

Another shake of the fist from Carlos Alcaraz as he backs up the break with a forehand winner after sending Roman Safiullin out wide.

Just three games away from his first win since April.

After falling 30-0 down, Roman Safiullin claws two points back - moving level with a brilliant angled winner as he slides to meet an Alcaraz drop shot.

Carlos Alcaraz is having a much better time with break points than Roman Safiullin. He converts that one at the first time of asking, forcing the Russian to net after swinging a blistering forehand into the corner of the court.

Britain's Jacob Fearnley will have to go the distance to reach the second round of the US Open.

Trailing 1-3 in the third set, Martin Landaluce won five of the next six games - including twice breaking Fearnley - to lead by two sets to one.

Fearnley opened the fourth set with a hold to love.

Image source, Getty Images

Even when he misses, he's smiling. Carlos Alcaraz was only millimetres away from making an incredible round-the-net forehand winner and his reaction is the same as the crowd - 'oooh'.

He's got a break point opportunity now as Roman Safiullin nets.

Another opportunity missed by Roman Safiullin as those three break points come and go, with Carlos Alcaraz able to cling on once again to hold serve.

That's a total of five break points missed by the Russian now.