Poland's Agnieszka Radwanska has booked a semi-final berth at the Indian Wells WTA hardcourt tennis tournament in Califfornia and denied Elena Dementieva a shot at a fourth final this year.
The fifth seed beat the fourth-seeded Russian 6-4 6-3 to reach the semi-finals for the first time.
The eighth-seeded, and new world top 10 player Australian Samantha Stosur will play Spain's Maria Jose Martinez in one of the remaining quarter finals while the sixth-seeded Serbian Jelena Jankovic will take on Russia'sn Alisa Kleybanova.
