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Gabriella Taylor fought a nasty bout of food poisoning before recording a memorable victory against No.2 seed Rebeka Masarova.
The last British junior in the draw missed her scheduled practice and managed just a few minutes on the practice courts after being physically sick from 5am on Wednesday.
Yet, somehow, Taylor recovered sufficiently to book a place in the quarter-finals, overcoming Switzerland's Masarova 6-1, 6-1 in just under an hour.
"It's a good job I didn't pull out," Taylor admitted, putting her illness down to pasta and chicken. "My rib muscles also hurt, I was finding it quite difficult to breathe."
Wild card Taylor faces No.5 seed Kayla Day on Thursday and was planning a good night's sleep first. The 18-year-old has been a regular on the senior tour in 2016, playing nine ITF events and losing in qualifying for both the WTA event in Birmingham and Wimbledon last month.
Based in Marbella for the last five years, she is ranked world No.419, more than 370 places above her 16-year-old Swiss opponent and that experience told.
It's a good job I didn't pull out
Positive headlines can't do any harm as Taylor continues her search for extra funding on top of the support she already receives from the Lawn Tennis Association when she joins the senior tour full-time after Wimbledon.
Olesya Pervushina, the No.1 seed, beat America's Alexandra Sanford 6-2, 7-6 and meets Sofia Kenin on Thursday.
In the boys' singles, world junior No.1 Stefanos Tsitsipas raced past France's Evan Furness 6-3, 6-3 and said he was relishing the expectation of becoming the first Greek to scale the heights of the junior game.
"I was thinking about it this morning before my match and it feels great to represent my country at such a big level. I feel the pressure but I think it's a good pressure. It doesn't make me play worse. It's the kind of pressure that keeps you motivated to play better every time."
But as pleased as he is with his ranking, Tsitsipas won't be satisfied until he bags his maiden junior Grand Slam. The 6ft 4ins 17-year-old reached the quarter-finals of the Australian and French Opens in 2016 and hopes to go two rounds better at Wimbledon on his favourite surface.
"It's a great accomplishment, something I was dreaming of as a child. This No.1 spot is very important for me. But I keep putting goals for myself. The next one is winning a Grand Slam which I believe is much more important than the No.1 spot. I still enjoy being No.1 though," he said.
Tsitsipas will play Jurabek Karimov for the a place in the semi-finals after the Uzbek upset the No.6 seed, Japan's Yosuke Watanuki 7-6(4), 6-4.
In the bottom half of the draw, Canadian No.3 seed Felix Auger-Aliassime cruised into the quarter-finals with a 6-0, 7-5 victory over Poland's Piotr Matuszewski.
