Defending champion Carlos Alcaraz has breezed into the third round at the US Open with another straight-sets win.
This time the victim was Lloyd Harris, who used to train with Alcaraz when the world No.1 was 15 at the Juan Carlos Ferrero Academy.
The South African gave Alcaraz a test in the third set but the seemingly unstoppable force still registered a 6-3 6-1 7-6 (7-4) win.
"I think I played a great match from the beginning until the last ball, but if I have to take something from the match I want to keep the level of the second set," said the 20-year-old Spaniard.
"I had to stay focused, stay strong mentally. It was pretty good for me and to win in straight sets is really important in the first rounds."
World No.3 and 2021 champion Daniil Medvedev recorded his 250th win on hard courts after securing a late-night 6-2 6-2 6-7 (6-8) 6-2 victory over Australia's Chris O'Connell.
After strolling to a two set-lead the Russian had looked headed for routine passage, but in the end needed all his resolve to push O'Connell to the exit.
"Tough match. I don't know why, but one moment in the match he decided to play better. I played the same from the first ball to the last," Medvedev, who will next face Argentine Sebastian Baez, said with a smile in his on-court interview.
"It became tougher for me. It became much tougher. I'm happy that I was able to still hang in there. I had opportunities in the third set, and I managed to use them in the fourth."
Jannik Sinner, the sixth seed who reached the Wimbledon semi-finals, advanced with a 6-4 6-2 6-4 victory over fellow Italian Lorenzo Sonego and will take on three-time grand slam winner Stan Wawrinka in round three. The Swiss 38-year-old and former US Open champion claimed a hard-fought 7-6 (8-6) 6-7 (7-9) 6-3 6-2 win over Argentine Tomas Etcheverry.
Elsewhere, American ninth seed Taylor Fritz coasted past Juan Pablo Varillas of Peru 6-1 6-2 6-2, while Russian eighth seed Andrey Rublev overcame a third-set wobble to beat Frenchman Gael Monfils 6-4 6-3 3-6 6-1.
Alexander Zverev, seeded 12, won the all-German clash against Daniel Altmaier 7-6 3-6 6-4 6-3 and will next meet 19th-seeded Bulgarian Grigor Dimitrov, who knocked out the 36-year-old 2012 champion Andy Murray, 6-3 6-4 6-1.
Australian Alex de Minaur, the 13th seed, demolished China's Yibing Wu 6-1 6-2 6-1 but big-serving John Isner bid farewell to his professional singles career after losing 3-6 4-6 7-6 (7-3) 6-4 7-6 (9-7) to fellow American Michael Mmoh.
Isner added 48 more aces to his record tally, starting strongly to win the first two sets before the physical nature of the contest took its toll on the towering 38-year-old.
Fittingly for Isner, his final set came down to a tiebreak with Mmoh completing the comeback in just under four hours.
"This is why I worked as hard as I have my whole life to play in atmospheres like this and of course I may not win them all as we know, just like today," an emotional Isner said during his on-court interview.
He'll be most celebrated for winning the longest professional tennis match in history against Frenchman Nicolas Mahut at Wimbledon in 2010, which lasted 11 hours five minutes.