I really want to see Ana beating Errani in R4! Before that she'll have to def Kuznetsova. I hope Ana manages to do both. QF would be really good result! However, I think she should believe she can go even deeper than QF.
Ana has a tough draw, Kuznetsova, Errani and Maria are all in good forms. Ana needs to take it one match at a time.
The saving grace is SF is certainly winnable if Ana gets there.