Okay, okay, the room isn’t always clean.

It’s often not clean at all. Charlie Robertson is a 17-year-old boy, and have you ever met a kid that age whose room was tidy?

“Yeah, I lose things all the time,” Robertson said with a chuckle on Wednesday.

The reason Robertson’s cleanliness is being exposed to the world is because two of the people who would know best about his tidy room were sitting courtside on Court 10 on Wednesday for Charlie’s third-round win at the US Open Junior Championships.

Tennis is a family affair these days for the Robertsons, since his sister Kirsty, 23, is one of Charlie’s coaches, and Mom, Alison, helps out too.

It could make for an awkward family dynamic, having a “working” relationship with the sibling who remembers when you were in nappies, and bickered with you at the dinner table.

But both Kirsty and Charlie say the arrangement is working just fine right now. Despite the Glasgow native being between lead coaches, he’s having a fantastic week here at the Billie Jean King National Tennis Center.

On Wednesday he continued his stellar 2024 by winning his third straight match, all in straight sets, at the US Open Junior Championships, beating No. 11 seed Jangjun Kim of Korea, 6-3, 6-4.

Robertson is now halfway to his first Grand Slam title, and to do it in New York, where his idol (and new friend) Andy Murray won his first Grand Slam, in 2012, would be beyond special.

“Yeah that would be pretty cool for another Scottish boy to win a Slam here,” Robertson said, his eyes aglow. “But [I'm] just taking it match by match for now.”

Kirsty Robertson, who works for Murray’s longtime trainer Matt Little, said her brother’s progress this year has been steady. Robertson reached the third round at Wimbledon and the final of J300 events at Roehampton and College Park, the latter being on hardcourts right before the US Open.

“He just believes in himself a lot more now; he knows he can compete with the top guys,” Kirsty Robertson said. “The way he plays, he knows he's going to be out there a long time, so just keep fighting and hitting ball after ball.”

“It’s quite good having her as a coach, we get along so well,” Robertson said. “And she can tell me to do something and I'll do it, because if I don't, I'll get it from my Mum. She’ll go tell Mum and then I’ll hear it from both of them!

“It's good though, she doesn't let me slack off.”

For Robertson, the year has been special for his results, but also for a week he got to spend training with Murray and his mother, Judy, in Greece for a week after Wimbledon, before Murray left for his Olympics swansong.

“It was so cool being around him; I was very nervous when I first met him, but he’s hilarious and he makes you feel like you’re part of the group,” Robertson said. “It was amazing to be around him, and Judy Murray, she hit baskets with me too while I was there.

“They’ve been incredible helping me.”

Also here supporting Robertson in New York are LTA coaches, including Martin Weston and Katie O’Brien, and Robertson’s success is just part of the British wave here.

Great Britain players are doing exceedingly well at the Open, with Robertson making the quarter-finals in boys (he plays Swiss qualifier Flynn Thomas Thursday), and Mingge Xu and Mika Stojsavljecic both making the girls quarter-finals.

And of course, Jack Draper reached his first Grand Slam singles semi-final on Wednesday.

“Definitely inspiring to see this great group we have do well,” Robertson said. “And with Andy being where I’m from, it really makes me realise that I can do it, too.”

Alison Robertson said this year’s success hasn’t gone to Charlie’s head, and that the key to that is routines.

“We try to keep everything calm, same routines every day, and he doesn’t get too high or low,” Alison Robertson said. “We’re just having a great time here.”

Three more wins and Robertson could have a new item for his messy room: A Grand Slam trophy.