Maria Sakkari, Elena Rybakina, Ekaterina Alexandrova and Kiki Bertens are through to the last eight after Friday’s quarterfinals at the St. Petersburg Ladies Trophy.
Russia’s Ekaterina Alexandrova received a walkover when third seed Petra Kvitova pulled out of competition because of illness that started affected her during yesterday’s second round. The 28th-ranked Alexandrova will play second-seeded defending champion Kiki Bertens in the semifinals, as the Dutch recovered from a 5-2 deficit in the second set and saved three set points to advance with a 6-4 7-6(3) victory over Russian qualifier Anastasia Potapova.