Jelena Jankovic routed Caroline Wozniacki 6-3, 6-1 to reach the quarterfinals of the BNP Paribas Open on Tuesday, winning a matchup of former tournament champions and No. 1-ranked players.
Jankovic next plays second-seeded Agnieszka Radwanska or 22nd-seeded Alize Cornet, who met late in a fourth-round match.
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 5-0 in the second set before Wozniacki held at 40-love to avoid getting shut out in front of her fiance, golfer Rory McIlroy.
Jankovic of Serbia was the world's top-ranked player in 2008. Wozniacki reached the top spot in 2010; she's now No. 12. Jankovic, ranked eighth, was the first top-10 player Wozniacki has faced so far this year.
Top-seeded Li Na played Aleksandra Wozniak of Canada, and American John Isner took on Yen-Hsun Lu of Taipei in night matches.
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.
On the men's side, Marin Cilic of Croatia defeated Tommy Robredo of Spain 6-4, 6-3 in a fourth-round match in the bottom half of the draw. Roberto Bautista Agut of Spain beat Jarkko Nieminen of Finland, 6-2, 4-6, 7-6 (6).