Both the U.S. population and Major League Baseball rosters have seen dramatic demographic changes over the past 50 years. The nation and the sport are becoming multilingual, with Spanish the unofficial second language. Today, 21 of 30 MLB teams broadcast at least some games in Spanish. Filling a gap in the literature of baseball, this collection of new essays examines the history of the game in Spanish, from the earliest locutores who called the plays for Latin American audiences to the League's expansion into cities with large Latino populations--Los Angeles, Houston and Miami to name a few--that made talented sportscasters for the fanaticos a business necessity.