Players, however, have not been universally in favour. On Sunday, Taylor Fritz reiterated his desire -first aired in a tweet last month – to ban all off-court coaching at individual events, saying the mental one-on-one battle so integral to the history of tennis was what makes it special.

“I think one thing that makes tennis such a unique sport, such a cool sport, is it’s genuinely as mental as it is physical. It’s a big, key part – in my opinion – to be able to figure things out and strategise by yourself,” the American said at the ATP Finals, where he beat Daniil Medvedev in his opening match.

“I just think ‘one versus one’ part of tennis where not only are you playing against each other, you’re also having this mind battle almost against each other,” he said. “It’s such a big part of the game. I think not a lot of people realie. I think you do have to play almost at the highest level to really understand how much strategy is going on.

“That’s something that should be between the two players. I think being able to make strategies, how you handle decision making, coming up with these kind of things under pressure, I think is just as important as hitting a serve or hitting a forehand.

“It would be insane if someone could come on the court for you and serve, right? So why can someone tell you what to do? That’s just how I feel. I compare it to the same as everything else you’re doing on the court. Why would anyone be helping you?