Meticulously slicing a juicy red apple while gripping a knife with her long, slender fingers, Anna Kournikova smiles as she prepares to reveal her latest indulgence. The sexiest athlete in the history of women's sports is discussing what it's like, at 25, to be retired -- well, that's not what she calls it, because she hasn't ruled out a comeback -- and now she's flashing those perfect white teeth and preparing to devour the fruit of her labor. "I read like crazy," she says, becoming visibly excited. "Magazines, short stories, books -- especially when I'm on an airplane or the...