Education
Nihon University.
三原 正
Nihon University.
Mihara began his boxing career when he was a third grader of the high school. He also got the group title of the university league as a captain of the Nihon University boxing club He experienced 38 matches during his amateur career.
Winning 28 (15 by knockout) and losing 10.
After that as the professional, Mihara fought 25 times between 1978 and 1985. Winning 24 (15 by knockout) and losing 1.
Since Leonard vacated the title after this, Mihara fought against Rocky Fratto for the vacant WBA world junior middleweight title in Rochester, New York on November 7, 1981. He lost his title after suffering a knockout during his first defence, against Davey Moore at the Tokyo Metropolitan Gymnasium on February 2, 1982.
His lumbago became chronic from these days.
He fought for a final time in March 1985, beating Tricky Kawaguchi by a unanimous decision.