TOKYO (AP) _ Qualifier Daja Bedanova of the Czech Republic continued her amazing run at the $535,000 Toyota Princess Cup women's tennis tournament Friday.

With a 5-7, 7-6 (0), 6-2 upset of fifth-seeded Amy Frazier, the 17-year-old Bedanova reached her first WTA Tour semifinal.

Frazier, who has reached the quarterfinals or better in every year except 1992 in nine appearances at the Toyota Princess, is currently ranked No. 23 in the world.

In Saturday's semifinals, Bedanova meets the winner of the quarterfinal between second-seeded Serena Williams and No. 8 Jelena Dokic of Australia.

``It's going to be a very difficult match, no matter who wins,'' said a jubilant Bedanova. ``We'll see tomorrow ... I'll just try to relax on court to be able to run and have fun playing.''

``She played well today, getting lots of balls back,'' Frazier said. ``She served well and moved really fast and was strong on the big points. ... I think my serve let me down in the third set a little. I gave her a few free points. But overall she was forcing me to make mistakes.''

Benanova, who lives and trains in Leonberg _ near Stuttgart, Germany _ has had a remarkable run in Tokyo. In the second round on Thursday, she ousted 15th-ranked Amelie Mauresmo of France 5-7, 6-3, 6-3.

That was Benanova's second win over a top-15 player. Her best career win came earlier this year in Los Angeles when she upset eighth-ranked Nathalie Tauziat of France in the first round.

Benanova started the year ranked 294th in the world, but came into the Toyota Princess ranked No. 87. By reaching the semis, she will most likely break into the top 60.