STUTTGART, Germany — Top-seeded Caroline Wozniacki was eliminated in the second round of the Porsche Grand Prix on Thursday, losing 6-4, 6-4 to Lucie Safarova of the Czech Republic.

Wozniacki showed signs of still being bothered by a right ankle injury, which she sustained 10 days ago at the Family Circle Cup in Charleston, S.C. The Danish player was forced to retire during her semifinal match there, and had a bye in the first round at Stuttgart.

"I didn't feel like I could move 100 percent," said Wozniacki, a U.S. Open runner-up last year. "When you can't move, it's difficult to win."

Safarova, ranked No. 38, made her second quarterfinal of the year and said she could notice Wozniacki was struggling with the injury.

"I tried to make her run and to push her around," Safarova said. "I always need time to get used to clay but now I am playing better."

Qualifier Anna Lapushchenkova of Russia produced another upset by ousting sixth-seeded Victoria Azarenka of Belarus 6-3, 6-3, while fourth-seeded Jelena Jankovic of Serbia eased past Tsvetana Pironkova of Bulgaria, 6-2, 6-2.

"I am happy to get through," said Jankovic, the 2008 champion, who is seeking her second title of the year after winning at Indian Wells.

Seventh-seeded Samantha Stosur of Australia rallied to beat Alexandra Dulgheru of Romania 3-6, 6-0, 6-2 for a place in the final eight, extending her winning streak on clay to nine.

Stosur struggled against Dulgheru in the first set but was able to bounce back.

"She played a decent game, well enough," Stosur said. "I was frustrated but I tried to stay calm."