STANFORD, Calif. — Varvara Lepchenko of Uzbekistan beat second-seeded Angieszka Radwanska 6-3, 3-6, 6-4 on Wednesday to advance to the Bank of the West Classic quarterfinals.
Lepchenko beat fifth-ranked Radwanska for the first time in six meetings, edging a top-10 player for only the third time in 24 matches. Radwanska, the runner-up last year, became the highest seeded player to lose in the tournament.
Lepchenko will face Sachia Vickery, the American qualifier who beat Monica Puig 6-7 (4), 6-2, 6-1 to reach her first career WTA Tour quarterfinal. Vickery also won two straight in the main draw for the first time.
Also, eighth-seeded Andrea Petkovic beat qualifier Naomi Osaka, 6-2, 6-2. Petkovic will next meet the winner of Thursday night’s match between Venus Williams and Victoria Azarenka.
