which players will step up in the next couple of years?

step up to the top level and consisently beat the top players (lower part of the top 10). i'm thinking hantuchova, sharapova and maybe safina but i defiantely think sharapova and hantuchova will become top players.

in my mind i keep seeing venus, serena, maria and daniela as the top 4 players. the mind can play funny tricks but still i hope this is true for some reason i also see them as far ahead of the rest of the pack but in reality i know clijsters and henin have stepped things up this year and i don't see them falling off the grand slam contender list