punishment, still very much in play, still a sore spot with fans. suspend him, fire him. i believe he should not be suspended. the last seven months has been a nightmare. reporter: arbitrator frederick horowitz will hear both sides. rodriguez claims major league baseball used unethical practices to target him because he was overpaid and underperformed, and major league baseball s claim rodriguez took peds, performance-enhancing drugs, including testosterone and human growth hormone. mlb s case centers on this man, anthony bosch, founder of the now defunct anti-aging clinic biogenesis. is he prepared to testify monday that he gave rodriguez peds? if so, it would be a different account of what he told espn last april. i m a nutritionist. i don t know anything about
performance-enhancing drugs. reporter: that was then. one of bosch s former friends bobby miller suspects why bosch may have now changed his story. told me they paid him $5 million. they paid him. who s they? major league baseball. reporter: bosch s spokeswoman says he is cooperating with major league baseball but is not being compensated by the organization. mlb would not comment. bosch has not spoken to the press since that interview last april. we tried tracking bosch down at a hotel in coconut grove, miami. no luck approaching a car connected to him, either. can we have any sort of comment at all from mr. bosch? his spokeswoman says he looks forward to testifying at arbitration. rodriguez, in a fight to save his legacy. it s a big moment for baseball. it s a big moment for alex rodriguez, for yankees fans, and