Re: What VALID reason could be given for all the upsets at IW?
Let's see... Henin, Clijsters, Kuznetsova, Sharapova, Azarenka.
I guess it's probably the long break between AO and IW.
Sharapova won Memphis in between so there's no good reason for her.
Other players like Ivanovic and Hantuchova have not been playing well anyway - so not considered upsets.