Top seeded Serb Ana Ivanovic and third-seeded compatriot Jelena Jankovic perfected the semifinal line-up at the 2008 Pacific Life Open, winning their matches Thursday in Indian Wells to join Russian No. 2 seed Svetlana Kuznetsova and No. 4 seed Maria Sharapova as the last four women standing.

It marks the first time in tournament history that the top four women’s seed have all advanced to the semifinals, a feat accomplished twice on the men’s side in the 1980’s.

Ivanovic, coming off a fourth round scare against Italian Francesca Schiavone, was all business in her quarterfinal match. She powered out of the gates to take a 5-0 lead, and earned a set point on Zvonareva’s serve before the Russian finally held to get on the board.

After trading early breaks in the second set, Ivanovic earned triple break point at 4-all and converted on her third chance when Zvonareva’s return sailed wide, allowing the Serb to serve out the match in the next game.

“I thought I played some best tennis since my matches here, so I was really happy about that,” said Ivanovic. “In the second set I had a break up and little bit lost concentration in that game, and start to get a little bit more emotional and trying to go for too much and lost my rhythm a little bit. But I was just happy that at the end of the second set I managed to keep calm and play good.”

The 20-year-old Ivanovic, who rose to a career-high ranking of No. 2 after reaching the Australian Open final, said: “Coming into this tournament obviously I felt a little more pressure being top seed, but I just try to not think about it. I know I have a game to beat anyone if I play well and if I do what I’m supposed to do out there. All these players that are in the draw, I beat them before, so obviously that gives me lots of confidence.”

Jankovic moved though to the semifinals when two-time champion and four-time runner-up Lindsay Davenport retired with a lower back injury after losing the first set, 6-2, in 24 minutes.

“It was pretty obvious to me after two games that I was pretty sore out there, and it was quite hard to rotate,” said the 31-year-old Davenport, who came into the quarterfinal match riding an eight match winning streak. “Obviously with playing tennis you need your rotation, so I tried to do the best I could.  But sometimes these things happen, and when you're familiar with an injury, you kind of know right away what you're up against.”

The 23-year-old Jankovic will need to turn around her 1-4 record against fellow Belgrade native Ivanovic, whom she called her "favorite rival," to advance to her first title match of the season.

“For some reason, I don't have a good record against her,” said Jankovic. “Some players suit you more, some players don't. It's just the way it goes. But I've been working on my game the last 10 days or so, and I'm really feeling a lot better than I was in the beginning of the year, because at the moment I'm healthy... I have no injuries and I feel ready to train and get better. So I'm improving little by little. That's my main goal.”

The two Serbs will both be making their first appearance in the Indian Wells semifinals. In her two other showings, Ivanovic reached the quarterfinals in 2006 and fourth round last year. Jankovic’s best result in her previous six appearances was the fourth round in 2007.

In the all-Russian semifinal, both players will be looking to return to the Indian Wellls final for the second time: Kuznetsova was runner-up to Slovak Daniela Hantuchova in 2007, while Sharapova defeated Russian Elena Dementieva for the 2006 title.