In every athlete's life, there is a moment that determines what they are all about. It isn't just their legacy at stake in this moment, nor is it how they'll be viewed. It's more than that. It's the moment that defines them, and most athletes who reach that superstar, one-of-the-greatest-of-his/her-generation's level see that moment coming and embrace it.
And because of that embrace, they fail. They don't get what they wanted out of the moment. They don't get what their careers need.