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In page Mike McCormick (pitcher):

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McCormick made his major league debut for the Giants on September 3, 1956, at the age of 17,[1] relieving Rubén Gómez in the ninth inning and retiring all three batters he faced in a 5–1 loss against the Philadelphia Phillies.[2] He made two starts later in the season, and finished with a 0–1 win–loss record and a 9.45 earned run average (ERA) in ​6 23 innings pitched.[1]