<p>ST. PETERSBURG, Russia — Margarita Gasparyan and Daria Kasatkina both won in the round of 16 on Thursday as a record seven Russian players made the quarterfinals of the St. Petersburg Ladies Trophy.</p>
<p>The eighth-seeded Kasatkina beat Aliaksandra Sasnovich of Belarus 5-7, 6-3, 7-6 (2) and Gasparyan ousted Katerina Siniakova of the Czech Republic 6-4, 6-4 to give Russia a clean sweep of all four matches played Thursday. </p>
<p>Three other Russians advanced on Wednesday, giving the country seven players in the quarterfinals of a tournament for the first time. The WTA Tour said the last time seven players from one country reached the last eight of a tour-level event was in 1993, when seven Americans were in the Oakland quarterfinals.</p>
<p>The other two matches on Thursday were all-Russian affairs. </p>
<p>Anastasia Gasanova rallied to beat fifth-seeded Anastasia Pavlyuchenkova 1-6, 7-6 (8), 7-6 (4) despite being ranked 196 places lower at 241st. Second-seeded Veronika Kudermetova needed nearly three hours to overcome Kamilla Rakhimova 7-5, 3-6, 7-6 (5). </p>
<p>Top-seeded Ekaterina Alexandrova, Vera Zvonareva and Svetlana Kuznetsova advanced on Wednesday. The sole non-Russian player in the last eight is Romania’s Jaqueline Cristian.</p>
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