Emma Raducanu's dream debut run at Wimbledon continued into the fourth round with victory over Romania's world number 45 Sorana Cirstea.
The 18-year-old British wildcard, ranked 338th and fresh from completing her A-Levels, impressed in a 6-3 7-5 win.
Playing on a show court for the first time, she stunned 31-year-old Cirstea by taking eight games in a row.
"I am so speechless right now," Raducanu said.
"I didn't know what my reaction would be, and then that just happened. I'm so, so grateful for all the support I had today.
"This is by far the biggest court I've played on. I think I coped quite well in the beginning, I just tried to hold my nerve.
"When I was packing to come into the bubble, my parents said, 'Aren't you packing too much match kit?' I think I'm going to have to do some laundry tonight."
Raducanu becomes the youngest British woman to reach the Wimbledon last 16 in the Open era, and will face Australia's Ajla Tomljanovic next.
A day to remember If we did not know it before, we do now. There is a new star of British tennis - and her name is Emma Raducanu.
No-one was more shocked than Raducanu herself when she defeated Marketa Vondrousova on Thursday to reach the third round, saying she "felt like she was on holiday".
Coached by Nigel Sears, Andy Murray's father-in-law, she was only handed a wildcard into the main draw late on after making her WTA Tour debut at Nottingham earlier in June.
But just hours after Wimbledon heard British legend Andy Murray questioning his future after a third-round exit, it witnessed a new talent breaking through.
And as Raducanu walked on to Court One, she could not help but display a wry smile, looking around at the crowd as she laid out her towel and bag.
But she was not at all fazed by the thousands watching, holding break point in the very first game though missing out on the chance to take first blood.
Cirstea - who played her first Wimbledon when her opponent was just five - broke Raducanu in the fourth game. The young Briton broke back immediately in what was the start of a run that will be long remembered.
She went on to win eight successive games, sealing the first set in the process, and looked to be careering towards a dominant two-set win.
But when Cirstea - who defeated two-time Grand Slam champion Victoria Azarenka in the previous round - broke back in the fifth game, it looked as though the nerves were starting to creep in.
She held five break points in a near 15-minute game at 3-4 ahead, but it was a moment in the 12th game that perhaps sealed the match for her.
A remarkable backhand winner, that caused her to drop her own racquet in disbelief, was the moment Cirstea's head dropped, and Raducanu - who hit 30 winners in all - went on to earn her place in the fourth round on her third match point.
In reaching the last 16, she bumps her prize money up to £181,000 - considerably more than her total career earnings before Wimbledon of $39,558 (£28,762).
The fairytale story at Wimbledon ended with a frightening exit.
British wild card Emma Raducanu left her fourth-round match against Ajla Tomljanovic breathing heavily and being helped by trainers. A few moments later, the match referee announced that Raducanu, 18, would not return and the match was over.
At around 6 p.m. EST, several hours after the match had been completed, Wimbledon said there would be “no statement” from Raducanu on Monday night.
“Nice slow breaths, that’s it,” the trainer was seen telling Raducanu after the teen called for a medical timeout trailing 6-4, 3-0. “Take deep breaths, you can do it, you’re OK.”
The unknown Raducanu, ranked No. 338 in the world, had suddenly become the toast of England over the past week after pulling three shocking upsets to reach the Round of 16.
Her wins over Markéta Vondroušová in the first round and Sorana Cîrstea in the third round were her first ever matches against top-100 players.
“I am really kind of shocked. Emma must be really hurt being a Brit playing at home,” Tomljanovic said in her on-court interview moments after the match. “I am really sorry but it’s sport, it happens, I am really wishing her all the best.
Former tennis star John McEnroe is being criticized for his reaction on the BBC's broadcast to British teenager Emma Raducanu's mid-match retirement at Wimbledon.
McEnroe, a seven-time Grand Slam singles champion, appears as an analyst on the host country's television coverage at the All England Club. McEnroe also works as an analyst for ESPN.
Raducanu, 18, stopped playing while trailing in the second set of her fourth-round match against Ajla Tomljanovic on Monday night. Raducanu was visited by a trainer then left the court for a medical timeout. Eventually, the chair umpire announced that the 338th-ranked Raducanu would not continue because of a health issue without specifying why.
McEnroe told viewers, "It appears it just got a little bit too much, as is understandable, particularly with what we've been talking about this over the last six weeks, with Naomi Osaka not even here."
Osaka, a four-time major champion, pulled out of the French Open in May and missed Wimbledon because she said she needed a mental health break.
"How much can players handle?" McEnroe said. "It makes you look at the guys that have been around and the girls for so long -- how well they can handle it. ... We have to appreciate the players that are able to do it so well, and hopefully she'll learn from this experience."
More than two hours later, the All England Club said Raducanu had had difficulty breathing.
"I can't imagine being in her shoes, at 18, playing a fourth round in your home country. It's something I can't even imagine," Tomljanovic said, when asked about McEnroe's comments. "For him to say that, it's definitely harsh."
Said the BBC in a statement Tuesday: "John McEnroe offered his personal view on the pressures that tennis players face, based on both his own experience and those of current players. He was sympathetic to Emma's situation."