Did you watch the match Petra played against Serena? If she plays like that, Ana will be lucky to get games, let alone win the match.
She plays one good match in the midst of all those shitfests she's produced within the past two months and now she's going to play like that every match?
Her movement and fitness are as awful as ever. When you play the type of game that involves high risk, you're bound to have a day where your shots hit the lines. It doesn't mean you're regaining form, it means you're getting lucky; look at the way Cirstea and Lisicki look like world beaters in one match and go completely off the rail the next day. Petra of 2011 wasn't like a Cirstea or a Lisicki because she won big as a result of improved fitness and shot selection.
Pavsy was such a disaster in this match, especially the first set. I don't think she could believe her play either. And then Ana's confidence changes within two points and she starts to fall apart. Everything is great, and then OMG everything is horrible. Messy.