Mariko Masubuchi Japanese softball player Mariko Masubuchi (増淵 まり子, Masubuchi Mariko) (born January 24, 1980) is a Japanese softball player who played as a pitcher. She won the silver medal for Japan in the 2000 Summer Olympics.[1] References[edit] ^ Mariko Masubuchi Biography and Olympic Results This biographical article relating to a Japanese softball figure is a stub. You can help Wikipedia by expanding it.vte