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Jankovic made the quarterfinals for the first time since winning the Indian Wells title in 2010, when she beat Wozniacki. The Dane won the title in 2011 and lost to Maria Sharapova in last year’s final.

But she offered little resistance against Jankovic, who raced to a 5-0 lead in the second set before Wozniacki held at 40-love to avoid getting shut out in front of her fiance, golfer Rory McIlroy.

“I kind of found my way, found my rhythm, and I was striking the ball very well out there and took control of the points,” Jankovic said. “I just did not let her play what she plays. That was very important.”

Jankovic was the world’s top-ranked player in 2008. Wozniacki reached the top spot in 2010; she’s now No. 12. Jankovic, who is ranked eighth, was the first top-10 player Wozniacki has faced so far this year.

Jankovic ended a five-match skid against Wozniacki, with the Serb having recovered from a back problem that occurred in her match two nights earlier. Jankovic didn’t hit on Monday and felt too stiff to put her shoes on.

“I went on court today not knowing how I was going to feel, if I was going to be limited with my movement or if I was going to play my game,” she said. “But I did and I was surprised.”

Italian qualifier Camila Giorgi failed to build on her upset of defending champion Maria Sharapova, losing to countrywoman Flavia Pennetta 6-2, 6-1. Pennetta next plays American Sloane Stephens, who beat Alisa Kleybanova 6-3, 7-5.

American Lauren Davis withdrew from her match against qualifier Casey Dellacqua of Australia because of a gastrointestinal illness. Dellacqua advanced to the quarters against No. 6 seed Simona Halep of Romania, who beat Eugenie Bouchard of Canada, 6-2, 1-6, 6-4.