On July 13, 1963 — At the age of 43, Early Wynn pitches the first five innings to record his 300th victory when the Indians down the Kansas City A’s, 7-4. The win will be the future Hall of Famer’s last in the major leagues, and he will finish his 23-year career with a 300-244 record.

Sources:
National Pastime January 28

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