After all his good work to level the tie-break, Adolfo Daniel Vallejo double-faults to give Cameron Norrie a fourth opportunity.

But the Briton finds the net with a backhand - and now he must attempt to save a set point for the first time.

Three set points come and go for Cameron Norrie.

Huge credit to Adolfo Daniel Vallejo there, pulling out some terrific shots. He was 5-1 down in the tie-break, but this is anyone's set now...

Cameron Norrie appears in charge of a rally but nets a forehand on his first set point.

Another miss, after he is pushed to the back of the court, leaves him with just one more.

Cameron Norrie has upped his level when it matters at the end of this first set, while Adolfo Daniel Vallejo begins to fall away in the tie-break after an otherwise solid set of tennis.

A double fault gifts Norrie three set points.

Annabel Croft
Former British number one on BBC Radio 5 Live

44 minutes they've been out here and you imagine if the sets are going to be drawn-out like this, it's going to be drawn into a physical battle which is what Norrie absolutely loves.

Then youth down the other side, just 22 years of age, and just watching Vallejo walk you can see he's got an abundance of energy

Adolfo Daniel Vallejo investigates the ground after having a backhand called out, and accepts it missed the line as Cameron Norrie keeps the tie-break on serve.

And it looks like he may have broken Vallejo's resistance here, as the Paraguayan hits long and falls three points behind.

Cameron Norrie throws in a little serve and volley to surprise Adolfo Daniel Vallejo, and the Briton does force a tie-break.

Just the one break point across the opening 12 games. Who will be first to blink?

So, it's back over to Cameron Norrie to try and stay in the first set - this time taking us to a tie-break.

A missed forehand gives Adolfo Daniel Vallejo encouragement at 15-15.

Image source, Getty Images

Cameron Norrie loses out to Adolfo Daniel Vallejo in a battle of the drop shots as the Paraguayan avoids a tricky scoreboard situation following an opening double fault.

Vallejo shakes his racquet as he unleashes his 13th winner of the contest - an accurate forehand down the line - on his way to safety.

'Come on!' yells Cameron Norrie.

A big forehand flashes down the line as the British number one holds with a third successive point. Great response.

There's been little to separate these two so far, but Cameron Norrie finds himself serving to stay in the first set.

He's under real pressure as he nets while scuttling back to the baseline for 15-30.

Annabel Croft
Former British number one on BBC Radio 5 Live

That was impressive serving from Vallejo. He is really getting quite a few free points off it - great accuracy, he's mixing it up well and he looks very at ease on the court.

A stunning two-handed backhand from Cameron Norrie keeps the British number one within touch at 40-30, but Adolfo Daniel Vallejo holds his nerve to move a game away from the set.

No sign so far that Cameron Norrie is suffering at all from the rib injury which hampered his preparation.

After having a look at the first break point of the match, Norrie quickly wraps up his latest service game and he will now look to get stuck in to his opponent's serve once again as we reach the business end of this first set.

Annabel Croft
Former British number one on BBC Radio 5 Live

This is vintage Norrie when he's hitting his forehand like this.

Over the years, we've come to understand that not the just way Norrie won his tennis at the beginning of his career was with long drawn-out rallies, he then started to add aggression with his forehand getting closer to the lines.

Cameron Norrie turns up the heat on Adolfo Daniel Vallejo, forcing the first break point of the match with a forehand finisher.

But the Paraguayan responds with a quality first serve, before escaping from deuce with a composed winner into the corner.

Image source, Getty Images

Annabel Croft
Former British number one on BBC Radio 5 Live

What I admire most about Cam Norrie is his warrior-like attitude to the competitive side of the sport. He will never be beaten on fitness - injury, maybe - but fitness, you will never see him tire in a match.

In these brutal conditions, he'd be your worst nightmare to take on.

Amid the scorching temperatures in Paris, this match is yet to catch fire as both players remain dominant on serve.

Cameron Norrie has won seven of nine points behind his first serve as he levels at three games apiece - while Adolfo Daniel Vallejo has won 12 of 13 as he moves 30-0 up in his latest game.

Annabel Croft
Former British number one on BBC Radio 5 Live

I feel like Medvedev really beat himself out there. That was a very disappointing performance from him. I don't know what was going on with all of those drop shots - it was an obsession and stubborness with 'I'm going to win this match by playing drop shots' and they weren't working.

Image source, Getty Images

A couple of aces from Adolfo Daniel Vallejo help the Paraguayan to another hold of serve in the early stages of this one.

The series of straightforward holds of serve at the start of this match continue as Cameron Norrie responds but again can't get close to his opponent in the following game.