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John Montgomery Ward with 69.

Ward played for the Providence Grays in 1878 and 1879 at the ages of 18 and 19. He won 22 games in 1878 and 47 in 1879.

For pitchers whose careers started after 1900, Bob Feller has the most wins before age 20 with 31. Feller played three seasons (1936-1938) with the Cleveland Indians prior to age 20 and won 5 games at age 17, 9 games at age 18, and 17 games at age 19.

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12y ago

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