Another racer in that event, Gabriele Guarini, 50, also tested positive for EPO, according to Usada.

WSJ: Cycling's Minor Leagues of Doping

Guarini says he faces many business challenges in the fickle and cut-throat world of music and entertainment.

FORBES: Building A Brand After American Idol

Tonight launches the two-day season finale of the ninth season of American Idol, and Justin Guarini knows exactly how nerve-wracking it can be.

FORBES: Building A Brand After American Idol

Guarini said that with time, came maturity, and it was this newfound sense of self that has allowed him to be more in control with the projects he is involved with.

FORBES: Building A Brand After American Idol

Guarini didn't immediately respond to a request for comment.

WSJ: Cycling's Minor Leagues of Doping