BALI, Indonesia - Ana Ivanovic became the first woman in the semifinals of the Commonwealth Bank Tournament of Champions, routing the world's top teenager, Anastasia Pavlyuchenkova, in under an hour Thursday.

Ivanovic, unseeded at the $600,000 season-ending tournament, built a 60 50 lead before the No.3-seeded Pavlyuchenkova got on the board, but by then the chances of a comeback had faded and Ivanovic closed the door, 60 61.

"It was an almost perfect performance," said Ivanovic, who fired six aces to just one double fault. "Anastasia is a tough opponent and even though the score indicates it was easy, there were still a few close games. I thought I served well, played aggressively and moved well, so there wasn't much wrong today."

Ivanovic made a return to the Top 25 a few weeks ago after winning her first WTA title of the year in Linz, and this was a continuation of that form.

"It gives you confidence, not only the scoreline, but the way you play. I really think things are coming back together. I feel the things I've been working on, I can see them working in matches now, and that makes a big difference when you are under pressure and playing the important points in a match."

Check out some of Ana's best career moments in this special gallery.

The second match of the day was far closer, with one of the tournament's two wildcards, Kimiko Date Krumm, edging No.1 seed Li Na, 64 36 64.

Date Krumm burst out to a 5-1 lead, and although she did win the set 6-4, by then Li had found her range, and the Chinese No.1 took the second set, 6-3, and built a 3-1 lead in the third. But it wasn't over for the Japanese No.1, who won five of the last six games of the match to steal the victory, closing it out on her fourth match point when Li double faulted serving 4-5, ad-out.

"Li is a very tough player, but when I was losing in the third set, I just tried to push myself," Date Krumm said to the crowd after the match. "I still enjoy myself on the court and am focusing and trying my best every match."

Ivanovic and Date Krumm will play for the first time in the semifinals. "I've never played Ana before. She's tough, and so is everybody here," Date Krumm added. "Ana won Linz a few weeks ago. I'm just going to continue to try my best."

See some of Kimiko's best career moments in this photo gallery.

The other quarterfinals are Friday, with No.2 seed Aravane Rezai facing Alisa Kleybanova and No.4 seed Yanina Wickmayer facing Daniela Hantuchova.