French Open champion Anastasia Myskina of Russia takes on countrywoman Nadia Petrova while top seed Amelie Mauresmo of France faces Venus Williams in the quarterfinals of the Advanta Tennis championships in Philadelphia Friday.


Myskina reached the final eight with a straight-set win over Rossana Neffa-De Los Rios of Paraguay Thursday 6-4, 7-6. Petrova defeated American Amy Frazier 6-4, 6-3.


Mauresmo scored a straight-set win over Iveta Benesova of the Czech Republic 2-6, 7-6. 


The other quarterfinals have Wimbledon champion Maria Sharapova of Russia taking on Olympic bronze medalist Alicia Molik of Australia.  Former Australian and French Open winner Jennifer Capriati of the United States plays Vera Zvonareva of Russia. 


Some information for this story provided by AP.