Just when you start to think Elias Ymer is waning, the Swede comes back with some big questions for Jack Draper to answer.

Draper has to defend four break points to hold.

How key could that prove if he wants to see out the match in this set?

You may or may not have noticed that there aren't currently any matches taking place on Court One as ties take place across the rest of the Wimbledon estate.

If you are curious about why that is the case then fear not, former British number one Laura Robson has the answer.

Speaking on BBC Radio 5 Sports Extra and BBC Sounds, Robson said: "It is all about protecting the grass courts. You don’t want to go too heavy on your stadium courts. The ground staff probably think they've got off lightly with the day’s play on court one, maybe work on it for a couple of hours this evening, and it is used right throughout the tournament.

"Whereas if you can move matches onto court two and three, they’re not used as much in the second week of the tournament.

"Because it is a live surface, you are constantly thinking about protecting the baselines especially as much as possible."

Bit of a desperate challenge from Cam Norrie if you ask me. Well in!

A wayward game from the Brit as Facundo Diaz Acosta breaks to love.

Image source, BBC Sport

Cameron Norrie double faults and then hits wide to give Diaz Acosta a break.

Combined with an incorrect challenge, Norrie won't be happy with that service game at all.

As the competition toughens, Jack Draper is not going to be able to get away with these lapses in concentration which has happened in this match on a couple of occasions.

It's within his reach to get a couple more breaks to try and finish this guy off.

Jack Draper broke Elias Ymer three times in the third set and he's looking to pick one up early in the fourth to make up for dropping his serve in that last game.

The Brit takes the game in emphatic style with a forehand slam which lands cleanly on the line. Ymer challenges the call but it was the correct call from the line judge.

Norrie holds and then fails to capitalise on opportunity at 15-30 on Diaz Acosta's serve.

He seems to be blaming an errant bounce but he's still got the break. Two more holds.

Britain's Fran Jones is into a third and final set against Petra Martic of Croatia.

Jones appears to be struggling with an injury and receives treatment after losing serve in the third game of the decider.

Can the Brit battle back from a break down while clearly hampered by injury?

It didn't start well for Jack Draper against Sweden's Elias Ymer on Centre Court, losing the opening set, but the British number one hit back to win the second and third sets.

With the finishing line in sight, can he get the job done in four?

Elias Ymer has got to be frustrated that he lost the last set.

Can he summon some more belief again? I don't know. He's seemingly played the best he could to this point.

There have been ups and downs in this match. Every time you think Draper is going to steam-roll through some tension comes into his game, giving his opponent some hope.

But that is the beginning of slams – a lot of extra nerves and tension.

It’s very scenic on court three.

Image source, BBC Sport

Image source, Getty Images

Jack Draper is on the verge of holding his first service game of the fourth set as he tries to lob Elias Ymer with a 40-15 lead but the Swede flicks it back over his head to win the point.

They eventually up at deuce before Ymer gets advantage and an early chance to break.

He takes it and lets out a huge scream as Draper scoops the ball into the net.

Maybe this set isn't going to straightforward for the Brit.

Two tidy aces at deuce from Cameron Norrie help get him out of trouble from 0-30 down before he then breaks the Diaz Acosta serve.

It was a nervy break point rally before Diaz Acosta then hit marginally wide into the tramlines. He's not a happy bunny.

Just a few rows in front of me are Cam Norrie’s team.

They must be happy with what they’re seeing from their man so far as they shout “come on, Nozzer” after his hold of serve.

Elias Ymer has taken the opportunity to head off court for a brief break between sets.

Jack Draper takes the opportunity to get out a new racquet and he's taping up the handle as he waits for his opponent to re-emerge.

Here comes Ymer and we're ready to go in the fourth set with Draper on serve.

You really are in and amongst it on court three. As Jack Draper took the third set, you could hear a huge roar coming from Centre Court behind me.

Like his British compatriot, Cam Norrie is heading towards round two as things stand.

Some beautiful play from Diaz Acosta helps him hold early in the second set.

Deft play including a joyous drop shot is entertaining the crowd on court three.

As we reported earlier, Andy Murray says he is "disappointed" not to be playing in the Wimbledon singles.

His farewell to the All England Club will be in the doubles alongside older brother Jamie.

Murray, who is planning to retire later this year, had surgery 10 days ago on a back issue.