Effective period / Period of releases: 1993

Members: Junya Kato, Hironori Yoshikawa, Yoshihiro Toyokawa, Kazuhide Shirota, Shinki Kitaoka

Grand Slam is a hard rock/heavy metal band from Tokyo, Kantō, Japan, that was formed in 1989.

Grand Slam are a supergroup consisted of former members of several notable Japanese hard rock and heavy metal bands. Active from December 1989 to February 1997.
The band's first CD entitled "Grand Slam" on the independent label Danger Crue Records was released in May 1990 under a temporary moniker of Golden Bat due to the legal complications with a major label Alfa Records which the band had already been signed to at the times of its release. In 1994, they were briefly back on Danger Crue and had another indie release called "Big Deal" before signing Tokuma Japan Communications in 1996.