A baseball bat has a core section formed exclusively of bamboo fibers fused together and an outer section substantially surrounding the core section. In a method for fabricating a blank from which a baseball bat is fabricated, a core section is fabricated through harvesting elongated bamboo pieces, removing the epidermis or skin from the bamboo pieces, cutting the bamboo pieces into a predetermined length, fiberizing the bamboo pieces, fusing the bamboo fibers to form a solid and unitary core blank, and processing the solid core blank to provide a core section have a substantially square cross section having opposite front and rear sides and opposite top and bottom sides.