World no.2 Caroline Wozniacki made it into the semi-finals of the Family Circle Cup by registering an easy win over Nadia Petrova with a 6-3 6-4, here in Charleston on Friday.

Now, Wozniacki will meet Vera Zvonareva in the semi-final, who defeated American Melanie Oudin 7-5 6-2.

Daniela Hantuchova rallied to cause the big upset of the tournament, as she beat second-seeded Jelena Jankovic with a 1-6 6-3 6-3.

Hantuchova will meet Samantha Stosur of Australia, who thrashed Peng Shuai of China with a 6-4 6-1.

After the match, Wozniacki said, "I feel like I'm playing very well." She further added "I'm very confident, and I've got some good results with my play."

Lamented over her performance, Jankovic quoted, "I played really well in the first set and I played really aggressive, but then I just stopped and I especially had trouble hitting my backhand.