St. Louis Cardinals first baseman Albert Pujols became the fastest in number of seasons to reach the 400 home run plateau.
Alex Rodriguez is the youngest player to hit 400 HRs (29 years, 316 days).
Mark McGwire had the least amount of ABs (4726) when he hit #400.
Sammy Sosa had played the least amount games when he reached the 400 HR milestone (1354).
Babe Ruth became the first player in MLB history to hit 400 home runs on September 2nd, 1927.
I don't know who could run the fastest.
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Barry Bonds is the youngest to hit 450 home runs
Barry Bonds has the most home runs in Major League Baseball (762).
Barry Bonds, a former little leaguer, hit 763* home runs.
Tony Conigliaro (born January 7, 1945) of the Boston Red Sox was 19 when he hit 24 home runs in the 1964 season. He is the only MLB player to have hit 20+ HRs in a season while a teenager.
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