I don't think Vika's foot injury is all that serious. She's not playing this week, so she should be fine for the Aussie open.
Funny thing is with Serena is that she didn't even play that great in Brisbane but still won it with absolute ease
. Big shock if she doesn't win the AO. The only players below them 2 who are in some sort of form are Radwanska & Li. Li is inconsistent, so there is always a chance that she goes out, and i think Aga is beatbale for those lower seeds. Of course it would require them to play well, but i could see one of those players doing it if they do play well.