14 Dec 1986
Chang Jung-Koo beats Hideyuki Ohashi via knockout 5/12
Light Flyweight (108 lb)
27 Jun 1988
Chang Jung-Koo beats Hideyuki Ohashi via knockout 8/12
7 Feb 1990
Hideyuki Ohashi beats Choi Jum-hwan via knockout 9/12
Minimumweight (105 lb)
Hideyuki Ohashi becomes the WBC Minimumweight world champion
8 Jun 1990
Hideyuki Ohashi beats Napa Kiatwanchai via unanimous decision 12/12
25 Oct 1990
Ricardo Lopez beats Hideyuki Ohashi via knockout 5/12
14 Oct 1992
Hideyuki Ohashi beats Choi Hi-yong via unanimous decision 12/12
Hideyuki Ohashi becomes the WBA Minimumweight world champion
10 Feb 1993
Chana Porpaoin beats Hideyuki Ohashi via majority decision 12/12