(CNN) -- Defending champion Ana Ivanovic enjoyed the easiest of passages into the semifinals of the WTA tournament at Indian Wells.
Ivanovic has been in fine form at the hardcourt event in California.
World number five Ivanovic had a walkover as Austrian opponent Sybille Bammer withdrew with a shoulder injury.
She will play Russian teenager Anastasia Pavlyuchenkova who continued her surprise run in California by beating seventh seed Agnieszka Radwanska of Poland.
The 17-year-old had beaten world number two Jelena Jankovic in the second round and saw off Radwanska 7-6 6-4 to reach her first semifinal on the WTA circuit.
Pavlyuchenkova saved two set points at 6-5 and 7-6 down in the tie-break to take the opening set.
"I thought about previous matches against her and just tried to avoid all of the mistakes I made before," Pavlyuchenkova told www.wtatour.com
"The last time I played her was at Wimbledon last year. I think my game has improved a lot since then. I'm also more confident now. All these things, all these elements came together this time. Maybe this was just the time to beat her. I'm very happy about this win."
Pavlyuchenkova broke Radwanska for a 5-3 lead in the second set but immediately surrendered her own serve.
But she regrouped to break again and close out the victory to earn a clash with reigning French Open champion Ivanovic.
Friday's other semifinal will see doubles partners Vera Zvonareva of Russia and rising Belarus star Victoria Azarenka meet.
Azarenka beat top seed Dinara Safina in the quarterfinals to wreck the Russian's chances of claiming the world number one ranking from Serena Williams, who is sitting out the tournament in California.