On April 20, 1966 – At Connie Mack Stadium, Hank Aaron hits his 399th and 400th home runs to lead the Atlanta Braves to a victory, 8 – 1, over the Philadelphia Phillies . The first shot is off starter Ray Culp in the 1st inning, and number 400 comes in the 9th, off Bo Belinsky. Bobby Bragan Apparent
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Source: Historical record