Ted Williams Hits .406

Entering a season-ending doubleheader against the Philadelphia Athletics on September 28, 1941, Boston Red Sox outfielder Ted Williams was batting .39955, a figure that would have rounded to an even .400. Manager Joe Cronin offered to sit him out to protect the milestone. Williams refused, played both games, and went 6-for-8 to finish the season at .406.

No Major League player has hit .400 or better for a full season since. Williams was 23 years old and would go on to serve as a Marine Corps pilot during both World War II and the Korean War, missing nearly five full seasons of his prime.

Williams won the Triple Crown twice, in 1942 and 1947, and finished his career with a .344 batting average and a .482 on-base percentage, still the highest career on-base percentage in Major League history.