I think Shriekarenka has the edge, though Li Na can certainly win if she stays focused and plays her best.
I'm usually pretty dispassionate about who wins/loses, even when I am rooting for a favourite player. But I'm just disgusted with Azarenka's poor sportsmanship.
So, my hope would be that the crowd is so strongly for Li Na and lets Vika know loudly and repeatedly throughout the whole match that she is a cheating *#!*bag, so that she is so upset, she mentally implodes & loses.