“When August Wilson’s ‘Radio Golf’ opens tonight on Broadway in a $2-million production, investors won’t be relying solely on rave reviews to fill the Cort Theater’s 1,000 seats. In an unusually aggressive move, the producers hired five marketing firms to promote the show about an African American businessman who wants to run for mayor of Pittsburgh.” Wilson’s “plays have had mixed success on Broadway, whose nickname, the Great White Way, can sometimes be taken too literally.”