Defending champion Novak Djokovic has won his 100th Wimbledon match to move into the quarter-finals, where he has been joined by No.1 seed Carlos Alcaraz and third-seeded Daniil Medvedev.
But the headline act on the championships' eighth day was a hitherto little-known American.
Big-serving Chris Eubanks - ranked no. 43 in the world - made a mark at the weekend in Australia when he ended the nation's hopes by knocking out Chris O'Connell.
But gentle giant has now been noticed by the wider world after Monday's fourth round 3-6 7-6 (7-4) 3-6 6-4 6-4 win over Greek fifth seed Stefanos Tsitsipas.
Eubanks, 27, is no spring chicken but after finally making it into the Wimbledon main draw for the first time he has made it into the quarter-finals of a grand slam for the first time.
The 24-year-old Tsitsipas, who was in action for the seventh day running after having to put up with numerous rain disruptions during his matches, was bidding to become the first Greek man to reach the last eight at the All England Club.
But he met his match in the 2.01m Eubanks, whose cheering squad included his occasional mixed doubles partner Coco Gauff.
"I feel like I am living a dream right now, this is absolutely insane," he said. "It's surreal, it's unbelievable, I can't believe it."
Eubanks now meets Daniil Medvedev who reached the quarter-finals for the first time when Jiri Lehecka retired injured after losing the first two sets 6-4 6-2.
Lehecka, 21, who had played a four-hour five-set match against Tommy Paul in the last round, had treatment for blisters on his right foot after the first set.
Djokovic was temporarily knocked off course by big-serving Pole Hubert Hurkacz but quickly got back in the groove to book a match with Russian seventh seed Andrey Rublev on Tuesday..
Having edged two tiebreaks late on Sunday before being beaten by the tournament's 11pm curfew, the 36-year-old returned to lose his first set of the tournament before sealing a 7-6 (8-6) 7-6 (8-6) 5-7 6-4 victory.
Alcaraz lost the first set against 2021 finalist Matteo Berrettini, but then showed his class to win 3-6 6-3 6-3 6-3.
He next meets sixth-seeded Dane Holger Rune, another 20-year-old, who also dropped the first set. He, too, recovered to win in four defeating Grigor Dimitrov 3-6 7-6 (8-6) 7-6 (7-4) 6-3.
Men's quarter-finals (seed in brackets): Carlos Alcaraz (1) v Holger Rune (6), Daniil Medvedev (3) v Chris Eubanks, Jannik Sinner (8) v Roman Safiullin, Andrey Rublev (7) v Novak Djokovic (2).