Madison Bumgarner in the 2012 season vs the Cincinnati Reds. At the age of 22. Also first ever in San Francisco Giants history to win 4 consecutive shutouts in a season. No. 5 tomarrow with Matt Cain.
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Dwight Gooden won 24 games for the New York Mets in the 1984 season at the age of 20.
Through the 2008 season, that is Jon Leiber who went 20-6 for the Cubs in the 2001 season.