Maria Sharapova of Russia returns a ball to Germany's Sabine Lisicki in a fourth round match at Wimbledon.

Maria Sharapova suffered a shock exit from Wimbledon yesterday as Germany's Sabine Lisicki avenged last year's semifinal defeat with a 6-4, 6-3 fourth round victory over the world No. 1.

Lisicki will play four-time grand slam champion Kim Clijsters or German eighth seed Angelique Kerber for a place in the last four.

"It's just unbelievable. I'm so happy. I had lost the last three meetings with her, so it's nice to finally win one," Lisicki said.

China's Li Na once described Lisicki as 'serving like a man' and the German was keeping Sharapova firmly on the back foot with her howitzer deliveries.

Also, four-time champion Serena Williams survived a gruelling examination from Yaroslava Shvedova to reach the quarterfinals with a 6-1, 2-6, 7-5 victory.

Polish third seed Agnieszka Radwanska also reached the quarterfinals on Monday with a 6-2, 6-3 win over Italian qualifier Camila Giorgi.