clijsters, dokic and henin, seles, mauresmo, capriati, davenport have the best chance but only because they are the ones that face them more often than the rest of the tour.
i don't think henin or dokic can do it unless a williams is playing badly and that doesn't happen that often so they're out.
i think davenport, capriat, clijsters, seles and mauresmo have been the closet to beating them consistently this season.
and i think the girls that can rise up and challenge them are hantuchova, bovina, petrova, krasnoroutskaya and tulyaganova.
all in all think currently form-wise the only girls that have a chance against the williams sisters are davenport, hantuchova, bovina and clijsters
Go the aussies! stosur!!!
and good luck russians: dementieva, safina, kirilenko, sharapova, kuznetsova, bovina, zvonareva, dushevina.
also good luck to: azarenka, lucic, sprem, vakulenko, vaidisova, safarova, ivanovic, groenefeld, mirza, krajicek, kvitkova, larcher de brito, lisicki.