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In page Dwight Gooden:

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Gooden made his major-league debut on April 7, 1984 with the New York Mets at the age of 19. He quickly developed a reputation with his 98 MPH fastball and sweeping curveball, which was given the superlative nickname of "Lord Charles", in contrast with "Uncle Charlie", a common nickname for a curveball. He was dubbed "Dr. K", in reference to the letter "K" being the standard abbreviation for strikeout, which soon became shortened to "Doc". Gooden soon attracted a rooting section at Shea Stadium that called itself "The K Korner", and would hang up cards with a red "K" after each of his strikeouts.