April 16, 1963: On Opening Day at County Stadium , Eddie Mathews hits the 400th home run of his career off of Phillies’ Jack Hamilton. It was a two-run shot, driving in Hank Aaron . At the time, Mathews became 7th on the all-time home run list. Trailing only Ruth, Foxx, Williams, Ott, Gehrig & Musia
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Source: Historical record