Perfect fighter for Arguello, Diaz has a good chin but Arguello is one of the best punchers of all time. Arguello via K.O within ten rounds.
Competitive early on. Until Arguello figures out Diaz cannot hurt him, then steps up the pressure. Arguello by TKO about ten. Diaz cannot come from behind with his lack of power.
Arguellos precise powershots would be too much for Diaz who gets stopped around the seventh or eight rounds.