Maria Sharapova's hopes for a second straight Grand Slam were dashed Monday with a fourth-round upset.
The top-seeded Sharapova was defeated by No. 15 seed Sabine Lisicki 6-4, 6-3.
"It's just unbelievable," Lisicki said, according to the AP. "For the third time I've beaten the French Open champion here. I'm just so happy. I've lost the three previous meetings against her. Now I just played well and beat her for the first time."
In other women's bracket news, No. 6 seed Serena Williams earned a 6-1, 2-6, 7-5 win over Yaroslava Shvedova.
On the men's side, top-seeded Novak Djokovic had no problem in his fourth-round match, earning an easy 6-3, 6-1, 6-3 win over Viktor Troicki.
The second-highest-ranked men's player remaining, No. 3 seed Roger Federer, had some issues.
Federer dealt with a back injury, even calling for a medical timeout, but was able to secure his 33rd straight Grand Slam quarterfinals appearance with a 7-6 (7-1), 6-1, 4-6, 6-3 win over Xavier Malisse.
"I feel way better than a few hours ago," Federer said after the match. "Honestly, I'm not too worried. I've had bad backs over the years. I just have to keep an eye on it now. ... I hope I'll be 100 percent on Wednesday."
For a full scorecard from Monday, check out SI.com's tennis page.