Williams posted a 6-2, 6-1 win over Tamarine Tanasugarn and is matched in Friday's quarterfinals against qualifier Marta Domachowska, who was a 7-5, 6-2 second-round winner Thursday over Severine Bremond.
Agnes Szavay, seeded second a week after collecting a tournament title in Beijing, also made it to the quarterfinals, eliminating Galina Voskoboeva 6-1, 6-4 in the second round. The draw has Szavay next playing fifth-seeded and defending Seoul champion Eleni Daniilidou, who won Thursday 6-3, 6-2 over Ahsha Rolle.
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