American sisters Venus and Serena Williams have advanced to the last 16 of the U.S. Open tennis tournament in New York, where they will face off Sunday.

Two-time champion Serena beat Italian Francesca Schiavone, 6-3, 6-4 on Friday, and Venus downed Daniela Hantuchova of Slovakia 6-3, 6-3.

Women's top seed Maria Sharapova of Russia also won her match in straight sets (6-2, 6-4) against German Julia Schruff. She next faces India's Sania Mirza, who scored a straight-set win over Marion Bartoli of France (7-6, 6-4).

In men's play, 2001 champion Lleyton Hewitt of Australia scored a straight-set win over Jose Acasuso of Argentina (7-6, 7-6, 6-2). Hewitt takes on American Taylor Dent in the third round. Dent scored a four-set win over Nicolas Almagro of Spain (6-3, 6-2, 4-6, 7-5).

Sixth-seeded Nikolay Davydenko of Russia lost in straight sets to Paradorn Srichaphan of Thailand (6-4, 7-5, 6-3). Max Mirnyi of Belarus defeated Florent Serra of France (7-6, 6-7, 6-4, 7-6). David Ferrer of Spain ousted Karol Kucera of Slovakia in straight sets (6-3, 6-0, 6-2).

Some information for this report provided by AP and Reuters.