Maria Sharapova suffered a shock defeat in the second round at Wimbledon Wednesday after being beaten by Portuguese qualifier Michelle Larcher De Brito.
Third seed Sharapova, who won the tournament in 2004, was brushed aside 6-3 6-4 by a player ranked 131 in the world.
The Russian appeared to be unhappy with the conditions of the grass court and fell during the second set and appeared to tell the umpire that "this court is dangerous."
But after receiving treatment for her fall, she was unable to stave off one of the biggest Wimbledon upsets in recent years.
"I just tried to stay calm," Larcher De Brito told the BBC.
"I was playing so well I thought I could keep it up and I just hung in there. She's a fighter, she just wouldn't give up for anything.
"There's lot of grass that's been cut and not been swept up so there's a lot of dead grass so it's not been easy. It's a tough court to play on."
Sharapova slipped and fell on Court Two on a couple of occasions and needed a time out to receive treatment to her left hip after the eighth game of the second set.
"It was a combination of everything," World No. 3 Sharapova told the BBC.
"I give her a lot of credit, she played extremely well today, really solid from the baseline, I don't think I was aggressive enough. I just wasn't there."
When asked about the slippery nature of the court and her comment about the surface being dangerous, she added: "I don't think I've ever fallen three times in a match before in my career, so that was a little strange.
"Well, after I buckled my knee three times, that's obviously my first reaction."
The victory is De Brito's greatest yet with this win representing the first time she has beaten a player ranked inside the top five.
The 20-year-old, who will play Karin Knapp of Italy for a place in the last 16, has never progressed past the third round of a grand slam.