Jack Draper has revealed how his coach has hit him with a ban after reaching the US Open quarter-final.
The Briton has quickly endeared himself to the Flushing Meadows crowd and will face Tomas Machac in his first Grand Slam quarter-final.
The 22-year-old will face off against the world No. 39 on Monday, having beaten Botic van de Zandschulp in the third round at the Grandstand on Saturday.
And the British No. 1 has admitted that he has been told to cut caffeine out of his diet, heading straight back to his Manhattan hotel every night rather than see the sights of New York.
“My coach doesn’t want me taking too much caffeine,” he said.
“It sends me too far over. For now, it is de-caf cappuccino.”
Draper might be off the coffees but his opponent has already got one over him this year.
Machac beat the youngster in Geneva in May, also going on to beat Novak Djokovic in the semi-final.
But Draper is in the form of his life, having not dropped a set and losing his serve only once - so it seems all work and no play makes Jack a dull boy, but a hell of a player.
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“I always was someone who liked to enjoy myself and maybe didn't have a working mindset,” Draper said, who has had injury problems in the past.
“Since last year, I've definitely sort of put my head down a lot more and just focused on myself and what's important to me and becoming a top player.
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“Now it's more important for me to go back and just have a Deliveroo in my hotel, so I'm taking full advantage of any recovery to be able to give my best on the court.
“I try and watch movies. I can make a cup of tea in the room and then watch a series or something. I watched Gangs of London recently.
"Just anything to conserve mental and physical energy, whether that's calling home or just being chilled, really.
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“It's sometimes a bit of a lonely existence being a top tennis player. You have just got to make many sacrifices.”
After Dan Evans crashed out of the US Open on Sunday and Emma Raducanu's shoddy first-round exit, Draper is Britain's last hope in New York.
And with Andy Murray retiring over the summer, Britain is crying out for a new tennis hero.
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