Qualifier Michelle Larcher De Brito caused a huge shock by defeating third seed Maria Sharapova 6-3 6-4 at Wimbledon.
The world No 131 from Portugal capitalised on five double faults sent down by the 2004 champion to win through in an hour and 34 minutes.
The Russian never looked happy on Court Two against a tenacious opponent who, like Sharapova, hails from the Bolletieri academy in Florida.
Sharapova looked rusty and only just managed to hold serve as Larcher de Brito threatened to go 5-1 up in the first set.
The 20-year-old would not be denied for long, though, and took the first set in just 34 minutes to the astonishment of most in attendance.
She broke again in the third game of the second set and the Russian was not the first player this week to require a medical time out after she slipped midway through the set, appearing to suffer a hip injury.
She managed to save three match points as Larcher De Brito looked to serve out the match, which she duly did at the fourth attempt.
"I don't think I've ever fallen three times in a match before in my career, so that was a little strange," said Sharapova.
"But that's certainly not an excuse. I think today I've seen a lot of players fall and take a few hits and a few injuries. So I think that's just part of the game, part of what we have to deal with.
"I'm not making an excuse about the court. That's not why I made errors or I didn't make returns. The situation on the court was exactly the same as it was for my opponent.
"I just didn't deal with it as well as she did. I can't make excuses for my errors. Those are in my own hands."
Until now Larcher De Brito had been best known for her high-pitched screech that arguably outdid Sharapova's famous shriek.
Her victory blows the bottom half of the draw wide open with second seed Victoria Azarenka, fifth seed Sara Errani, ninth-ranked Caroline Wozniacki and 12th seed Ana Ivanovic already out of the tournament.