Fuentes was born in Loíza, Puerto Rico, in the barrio of Loíza Aldea. He starred as an amateur baseball player and, in 1968, helped lead his amateur team to a Puerto Rican championship. He was discovered by scout Felix Delgado, who went on to sign Fuentes to his first professional contract.\n', '

Fuentes was initially assigned to the Clinton Pilots, a Class A team in the Midwest League. He recorded an 8–2 record in 26 appearances and his earned run average of 1.46 was the lowest in the league for pitchers with 40 or more innings pitched. For his efforts, Fuentes was called to the Seattle Pilots\' Major League roster in September 1969.\n', '

He made his Major League debut on the first of September, striking out two in an inning of work against the New York Yankees. After a second relief appearance, Fuentes was given his first Major League start; he responded by throwing a complete game against the Chicago White Sox, giving up one run on seven hits.\n', '

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