Both Larsson and Siniakova were playing their second match of the day because of rain delays earlier in the week. Larsson beat Russia’s Svetlana Kuznetsova 7-5, 6-4 and Siniakova rallied to beat Mandy Minella 1-6, 6-3, 6-2.
Slovenia’s Tamara Zidansek upset third-seeded Ajla Tomljanovic 6-3, 6-4 to set up a quarterfinal against Veronika Kudermetova of the Czech Republic.
Also Wednesday, Nina Stojanovic reached the quarterfinals with a 6-1, 0-6, 6-3 win over Spain’s Sara Sorribes Tormo. The Serbian next faces Sorana Cirstea of Romania.
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