Jerry Koosman is only Mets pitcher with this unusual accolade

about 5 years in NY Post

THE 1 AND ONLY… Mets pitcher to have both won and lost 20 games in a season: Jerry Koosman The Time: 1976 and 1977. The Background: Koosman debuted in 1967 and didn’t take long to reach great heights. In his first full season, the left-hander won 19 games and then in 1969 he tossed a...

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