Since its inception in 1938, the Liga de Beisbol Professional de Puerto Rico has launched the careers of numerous island players, including Ruben Gomez, Jerry Morales, Orlando Cepeda, Vic Power, Ruben Sierra and the greatest of all Puerto Rican stars, Roberto Clemente. For many "imports," the league has been a stepping stone to major league stardom. In its early years, many of the league's stars came from the Negro Leagues: Satchel Paige, Josh Gibson,...