Na Merka i Canada ekiponan profeshonal den Major League Baseball (MLB) ta dividí den e National League (NL) i e American League (AL), kada un ku tres divishon: Ost, West i Sentral. E kampion di e liga mayó aki ta determiná pa medio di playoff ku ta kulmina den e World Series. E manera di hunga ki ta similarmente partí na Hapon den e Central League i e Pacific League i na Cuba den e West League i East League.