TIL The Mendoza Line is baseball jargon for a .200 batting average, the supposed threshold for offensive futility at the Major League level. It is named after shortstop Mario Mendoza, who failed to reach .200 five times in his nine big league seasons.

https://en.wikipedia.org/wiki/Mendoza_Line
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https://www.reddit.com/r/todayilearned/comments/1gfy2ym/til_the_mendoza_line_is_baseball_jargon_for_a_200/