Daniil Medvedev has worked the US Open graveyard shift again to oust in-form Sebastian Baez 6-2 6-2 7-6 (8-6) and ease into the fourth round of the season's final grand slam.
It was the second straight match that Medvedev started a contest one day and finished the next, having gone four sets with Australian Chris O'Connell in a late- night battle on Thursday that wrapped early on Friday morning.
"Tough, I just want to go sleep, that's it, nothing more," Medvedev, the 2021 champion, told the crowd that stayed to watch the match through to its conclusion.
The third seed's victory set up Medvedev for an intriguing last-16 meeting with Australian danger man Alex de Minaur.
The pair have met six times with the Russian winning four but de Minaur has won the last two, including a quarter-final clash at last month's Canadian Open.
Defending champion Carlos Alcaraz earlier overcame Britain's Dan Evans 6-2 6-3 4-6 6-3, surviving his first real challenge in the third round.
The top-seeded Spaniard breezed through his opening matches at Flushing Meadows and at first appeared on track for another easy victory but had to find his best form after Evans mounted a third-set comeback.
He next plays Italian Matteo Arnaldi, who shocked Britain's 16th seed Cameron Norrie 6-3 6-4 6-3 on Court 17.
"I'm feeling really, really well on court, really comfortable," said Alcaraz, who picked up his second major title at Wimbledon this year.
"I always say that I can be better, but right now I'm really, really happy with the level that I'm playing."
Alcaraz moved through the first set like a freight train, winning the first four games, and the 26th-seeded Evans failed to convert any of his three break points in the eighth game.
Evans did let out a roar as he broke Alcaraz with an unreturnable backhand down the line in the second game of the second set but the Spaniard broke back immediately and the Briton helped his opponent to another break in the fifth.
Alcaraz broke Evans again with a well-executed drop shot to close out the second set.
However, Evans upped his level in the third set, channelling his frustration into a superb game seven where he broke with a backhand winner.
The 20-year-old Alcaraz tapped into his superior speed and agility to tame Evans, 13 years his senior, in the fourth set, zipping back and forth along the baseline before breaking with a sublime forehand winner in the sixth game.
He finished the entertaining clash with another forehand winner, one of 27 in the match, prompting cheers of approval from the rapt crowd inside Arthur Ashe Stadium.
Alcaraz's fourth-round opponent Arnaldi said he had never faced a world No.1 before and would try to "enjoy the moment" against the heavily favoured Spaniard.
Across the plaza, 21-year-old Jack Draper offered British fans hope as he outlasted American wildcard Michael Mmoh 6-4 6-2 3-6 6-3 to book his first trip to a grand slam fourth round.
He will face Russian eighth seed Andrey Rublev, who beat France's Arthur Rinderknech 3-6 6-3 6-1 7-5.
Former finalist Alexander Zverev overcame Bulgaria's Grigor Dimitrov 6-7 (2-7) 7-6 (10-8) 6-1 6-1 in three hours and 40 minutes to also reach the last 16.
The 26-year-old will face Italy's Jannik Sinner, who prevailed in four sets against former US Open champion Stan Wawrinka.