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Peter_SpaethDom DeLillo's account of the Bobby Thomson HR game, Pafko at the Wall which is also the first chapter of his book Underworld, is great reading.
Frank, is the Celebrant an entire book, I could swear I read something very much like you describe, an account of a guy watching a young Mathewson pitch a no-hitter with his salesman brother, but it was just a chapter of one of those compliations of great sportswriting.