Mason Dixon is the heavyweight champion Rocky challenges in Rocky Balboa.
Dixon is a younger, undefeated champion whose public image has suffered because he is viewed as untested against a legendary opponent. A computer simulation and media attention lead to an exhibition match between Dixon and the retired Rocky.
The film contrasts Dixon’s modern professional career with Rocky’s enduring reputation. Rocky is no longer pursuing a championship run; he wants to prove to himself that he can still compete and honor the fighter he once was.
Antonio Tarver plays Mason Dixon. The character is fictional, and the exhibition is presented as a regulated sporting event within the film’s story rather than a standard title defense.