Venus and Serena are playing a level above the rest of the field at the moment. Capriati has the ground game to challenge them, but her serve can't do the job -- and she's mentally flaky against Venus and Serena.
Davenport hits the cleanest ball in the game, but her movement hurts and her head drops at the wrong times.
Mauresmo has the talent, but lacks the belief in herself and is a head case all her own.
Hingis -- she's a mere shadow of the player she used to be. I watched her match against Serra-Zanetti and was appalled. If I was her, I'd have spent the summer retooling my game and making some necessary changes. She has to mprove that serve and get to the net to revitalize her career.
As for the rest, Dokic, Clijsters, Henin, Seles, Hantuchova -- they'll get a few wins here and there, but there's a wide gulf between where they are and the top of the game.