Ioka made his second defense in June, 1988, against Napa Kiatwanchai of Thailand, retaining his title by a 12 round draw.
Hiroki Narimiya | Hiroki Matsukata | Hiroki Suzuki | Hiroki Kuroda | Hiroki Kokubo | Hiroki Tanaka | Hiroki Takahashi | Hiroki Morinoue | Hiroki Kikuta | Hiroki Azuma |