Jankovic downs Wozniacki in battle of ex-champions
Jelena Jankovic of Serbia hits a return during the BNP Paribas Open at Indian Wells Tennis Garden on March 7, 2014 in Indian Wells, California - by Stephen Dunn
In a rematch of the 2010 final in the California desert won by Jankovic, the seventh-seeded Serb showed no sign of the back trouble that required several visits from the trainer during her third-round victory over Magdalena Rybarikova on Sunday.
"Yesterday I was a little bit scared," Jankovic said of the pain that began when she wrenched her back on a point early in the match against Rybarikova.
"If I had to play yesterday, I probably wouldn't be able to go on court."
Since her 2010 triumph here, Jankovic had dropped five straight decisions to Denmark's Wozniacki.
And with golf-star fiance Rory McIlroy courtside, Wozniacki was quick to gain the upper hand in this one, breaking for a 3-1 lead in the first.
But Jankovic reeled off 10 straight games to put the match out of reach.
Serving to extend the opening set, Wozniacki couldn't put a first serve in play and was broken at love.
The Dane, who won the title in 2011 and was runner-up last year to Maria Sharapova, was unable to convert three break points in the fifth game of the second frame.
After Wozniacki finally held for 5-1 in the second, Jankovic wrapped up the win in just 64 minutes, returning to the quarter-finals here for the first time since her 2010 triumph.
Jankovic next faces either second-seeded Agnieszka Radwanska of Poland or Alize Cornet, the 22nd seed from France.
Chinese top seed Li Na was to take on Canadian Aleksandra Wozniak under the floodlights on Tuesday night for a quarter-final berth.
In other early matches, sixth-seeded Romanian Simona Halep reached the last eight with a 6-2, 1-6, 6-4 victory over rising Canadian star Eugenie Bouchard.
Bouchard broke for a 4-3 lead in the third set, but Halep immediately broke back and broke again in the final game.
Halep will face Australian qualifier Casey Dellacqua, who advanced on a walkover when American Lauren Davis withdrew with a stomach ailment.