However, his last encounter at Arthur Ashe in 2023 was a sobering experience as he was outplayed by Novak Djokovic, who also mimicked his telephone celebration. But, ultimately, Shelton left Flushing Meadows and the dazzling lights of New York knowing that his life had irrevocably changed.

His performances – coupled with his charisma – had put the tennis world on alert. Fast forward just under a year, and Shelton has found himself facing the reality of his new status.

In a nation that hasn’t seen a men’s singles major winner for 21 years, Shelton is viewed as the next great hope. He’s one of four Americans in the top-20 of the world rankings. However, there’s no doubt that Shelton, seeded No. 13 in this tournament, is the one generating the most buzz.

Last year, his US Open dream began on Court 10. He didn’t step onto Arthur Ashe until the round of 16. This year, he was the first man to stride onto Flushing Meadows’ signature court, kickstarting this two-week tennis spectacle which he enters with a new weight of expectation.

He’s got the swag that American spectators adore, and indeed the talent to boot – a thunderous 149mph serve, a fierce backhand, and an abundance of athleticism.

Yet, with the spotlight now beaming down on him, there’s no escaping the intense pressure. It’s said that pressure can forge diamonds, but it can also see promising talents crumble in the high-stakes world of professional sport.

Stepping onto the prestigious Arthur Ashe court for the opening game, Shelton dazzled, embodying the burgeoning superstar he is swiftly becoming.

After sailing through to victory in straight sets, he exclaimed, “I love being out here in New York,” continuing with effusive thanks, “Not much better atmosphere than being on Arthur Ashe, so thanks to all you guys, you lot brought the energy on day one today.”

Shelton added, “I’m glad I had the opportunity to open it up here. Thanks to all my guys who came out.”

Facing 2020 champion Dominic Thiem in what shaped up as a daunting first-round, Shelton started strong. A blistering serve and a cascade of forehand and backhand winners left Thiem misfooted, curbing any jitters.

He unleashed some sublime winners early in the match, commandeering his serve without yielding a break. As the first set approached its climax at 5-4, Shelton pounced at the chance.

Shelton dazzled spectators with his virtuoso display, kicking off with a stunning passage of play – a fierce backhand driving Thiem deep followed by a rapid dash to finish the job with a deft volley. He muscled through to deuce after edging an error from Thiem, eventually clinching the first set after a gritty rally.

The American prodigy continued his relentless assault to claim the second set and provided no respite in the final act, dashing any fairy-tale finish for Thiem’s last hurrah in a major tournament.

Shelton had the crowd riveted, erupting into cheers with each display of his raw talent and shot-making prowess. Yet, beyond sheer skill, he showcased a seasoned composure suggesting he is prime for the limelight he is beginning to command.

With an eye firmly on the future and improvement, Shelton reflected on his mindset. “We have a developmental mindset,” he said, emphasising progress.

He also shared his sentiment on playing at the prestigious US Open. “I’m glad how I played out here today, and just glad to have another chance to play out here at the U.S. Open, because it’s my favorite tournament.”

As challenges loom on the horizon, Shelton has marked himself as more than fitting for the drama and lights of Arthur Ashe Stadium, transitioning from dark horse to headliner.

The future of 21-year-old Shelton remains uncertain this year. He may not repeat his previous year’s journey to the semi-finals. However, rather than being a fleeting sensation, Shelton has already demonstrated his star quality and longevity in the sport.