Top-seeded Ana Ivanovic of Serbia stormed into the Pacific Life Open semi-finals with a 6-1 6-4 victory over Russia's Vera Zvonareva .
The 20-year-old, bidding for her first WTA title of the year, outplayed her opponent in a baseline battle to seal victory in just over an hour at Indian Wells Tennis Garden.
World number two Ivanovic, who lost to Russian Maria Sharapova in the Australian Open final in January, broke Zvonareva in the second and fourth games to breeze through the opening set in 24 minutes.
Service breaks were exchanged early in the second set before the pony-tailed Serb again broke in the ninth game when Zvonareva hit a forehand wide.
Ivanovic served out for victory to book a place in the last four against either American Lindsay Davenport or third-seeded Serb Jelena Jankovic, who were playing later in the day.
Fourth-seeded Sharapova and fellow Russian Svetlana Kuznetsova, the second seed, will contest the other semi-final after winning their quarter-finals matches on Wednesday.
