Impressive Jankovic eyes Slam title and return to the top

With top seed Ana Ivanovic of Serbia and Russian third seed Svetlana Kuznetsova already ousted, this is a prime chance for a Slam breakthrough.

"I want to win a Grand Slam," Jankovic said. "By winning a Grand Slam I would regain the number one ranking again. It's something I want to achieve again."

Jankovic reached the French and Australian Open semi-finals but was upset in the fourth round at Wimbledon by Thailand's Tamarine Tanasugarn after hurting her knee in a third-round victory over Wozniacki.

"I have been injured. Right now I finally do not have any problems," Jankovic said. "Little by little I feel like I'm getting better every day.

"I feel the shots a lot better than I did at the beginning of the tournament. That's my goal, get my game together by the end of the tournament."

Jankovic was down a set and in a fight during the second before cracking the Danish teen on her third break-point chance of the sixth game for a 4-2 edge.

"I started well. I played aggressive," Wozniacki said. "The second set, I got a bit more defensive. Even though I was hitting the ball, it wasn't going well. She kept coming in and forcing play. She was just better than me."