OK, you guys must have known I'd chime in on this one.
Let me start by saying Hingis force-fed me heaping helpings of crow with her comeback. I remember saying she wouldn't even make it back into the top 20, she'd only stay around for a few tournaments and would leave again, etc....
And she made it back to #6 in the world, made the year-ending championships, won a tier 1 event and did OK in two of the slams. As much as I've never cared for her attitude or her mouth, those are some pretty great accomplishments after three years away from the game, even if the Williams sisters were all but absent at the time and injuries were running rampant among the top players. Seriously, I would have never imagined it.
The talk then became about defending those points. Could she or would she do so when the "comeback honeymoon" was over? Did she over-achieve just to get back into the top 10? Would she stick around if she never got near to #1 ever again? Would she still want to play if she wasn't really contending for slams?
If you check my postings over the last year, I must have said "I wonder how long she'll stick around if she's not winning" at least a gazillion times...well, OK, more than twice.

I remember saying I'd be even more impressed if she stuck around and played for a long time without being a serious threat than I would be with the actual comeback's success, because that would prove how much she truly loves the game and loves being out there competing.
Well, as Gaga said, she doesn't like the heat, at all, and once again, is getting out of the kitchen. There's just something irritating about the way she chooses to leave, though. The real irritation comes in the way she tries to "justify" it.
Her first retirement was a convenient injury excuse. I, too believe she may have been injured. To the point of retiring with a 22 year old body that still has the ability to heal pretty quickly? Uh...no. Maybe, though, because of the more and more frequently occurring (at that time) beat-downs suffered at the hands of Lindsay, Jenny, Serena, and Venus? Uh...yeah. The "justification" came as a ridiculous lawsuit against the sneaker company claiming it was their fault she was injured and had to retire.
Bitch, please.
And now this.
I have to say, if this is a mistake, that just plain sucks. I know mistakes have been made in the past with drug samples, and the horrific damage they can do to someone's reputation. The "B" sample having the same result seems to make it less likely for me to believe, but recent events could have had a more favorable bearing on this.
If she had come out saying "I'm going to fight this, and defend my credibility and my good name" with a vengeance, I think it would speak volumes about her innocence. If she were to try and focus on the game while doing so (as tough as that would be) and continuing to show her love for the sport despite this adversity, that would speak volumes about her character as an athlete.
Saying "I'm quitting 'cause I don't want to play with this hanging over me, and nuh-uh, I didn't do it" is tantamount to stamping her foot on the ground and saying "I'm guilty, and I'm taking my bat and my ball and going home."
Dignity has never seemed to be her forte. I guess it only makes sense she'd have two undignified exits, and that she is effectively, for all intents and purposes, becoming the Petr Korda of the WTA.