Emma Raducanu swept aside in-form qualifier Janice Tjen to reach the third round of the US Open.
If anyone knows the danger of qualifiers, it is Raducanu, who famously became the only one to win a Grand Slam title here four years ago - a feat that inspired Indonesian trailblazer Tjen.
The 23-year-old must wait for another opportunity to try to make her mark, though, after being crushed 6-2 6-1 by Raducanu in exactly an hour on Louis Armstrong Stadium.
It was even swifter than her first-round victory over another qualifier, Ena Shibahara, which had been her fastest grand slam win.
"I'm very pleased with how I played," said Raducanu. "Super dangerous opponent, she was playing extremely well. I'm just looking forward to building day by day, doing my best."
For the second match in a row, Raducanu began the contest with an ace, and that set the tone for a terrific performance, particularly on serve.
She lost only seven points on her own delivery in the first set, hitting five aces - eight in the match - and relentlessly targeted the Tjen backhand.
The Indonesian has modelled her game on former world number one Ash Barty and her heavy topspin forehand was a key weapon in her standout round-one victory over 24th seed Veronika Kudermetova.
Tjen has won a huge amount of matches on the lower tours since graduating from college in California last year but she will not have faced many players at Raducanu's level.
This was another demonstration of just how well the British number one is playing - her strong serve backed up by precision groundstrokes, tactical acumen and excellent movement.
She will need all those to be on point if she faces former Wimbledon champion Elena Rybakina next, but Raducanu will rightly feel that she can be a significant obstacle for anyone in the draw.
The 22-year-old got better and better here, breaking serve twice in the first set and then racing through the second, with Tjen at a loss as to how to stem the flow of games against her.
She finally got on the board after seven in a row to avoid the love-set but Raducanu confidently served out the contest.
There was good and bad news for Raducanu’s male compatriots, with Cameron Norrie teeing up a third-round encounter against Novak Djokovic as he overcame Francisco Comesana, while Jack Draper, the fifth seed in the men’s draw, withdrew with an arm injury.
He was supposed to face the Belgian Zizou Bergs in the second round on Thursday.
