The top-seeded Russian will meet Aravane Rezai of France in the last warmup before the French Open.

"I'm happy for seeing my shoulders are healthy," said Sharapova, who missed two tournaments this year with a right-shoulder injury. "It's good for me to play tough matches like this."

The 62nd-ranked Rezai, who ousted Venus Williams in the second round, is seeking her first WTA Tour title. She beat Meghann Shaughnessy of the United States 1-6, 6-1, 6-4.

Elena Dementieva also rallied to beat Catalina Castano 1-6, 6-4, 6-4 in the quarterfinals of the clay-court championship. The second-seeded Russian plays fifth-seeded Alona Bondarenko of Ukraine in the semifinals.

"It was a long match," Dementieva said, after beating the Colombian in 2 hours, 34 minutes. "I'm glad I survived against her today."

Patty Schnyder of Switzerland withdrew from her quarterfinal against Bondarenko because of a thigh injury, cutting short her tuneup for Roland Garros. She pulled out minutes ahead of her match against Bondarenko.

Schnyder said she has suffered from pain in her right quadriceps since an earlier round of the tournament.