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Since 1950, the youngest player in franchise history was left-handed pitcher Mike McCormick, who made his major league debut with the New York Giants on September 5, 1956. He was 17 years and 342 days old. Since the Giants moved to San Francisco in 1958, the youngest player to make his debut was outfielder Ken Henderson, who was 18 years and 312 days old on April 23, 1965.

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