Mendoza line

The Mendoza Line is an expression in baseball in the United States, deriving from the name of shortstop Mario Mendoza, whose poor batting average is taken to define the threshold of incompetent hitting. The cutoff point is most often said to be .200 (although Mendoza's career average was .215) and, when a position player's batting average falls below that level, the player is said to be "below the Mendoza Line". This is often thought of as the offensive threshold below which a player's presence in Major League Baseball cannot be justified, regardless of his defensive abilities. The term is used in other contexts when one is so incompetent in one key skill that other skills cannot compensate for that deficiency.

Mendoza, an effective defensive player from Chihuahua, Mexico, played for the Pittsburgh Pirates, Seattle Mariners, and Texas Rangers and usually struggled at the plate. Mendoza was known as a sub-.200 hitter whose average frequently fell into the .180 to .199 range during any particular year — four times in the five years from 1975 to 1979.

The "Mendoza Line" was created as a clubhouse joke among baseball players in 1979, when from early May onwards, Mendoza's average was always within a few points of .200 either way, finishing out the season at .198 for the year (and .201 for his career to that point). "My teammates Tom Paciorek and Bruce Bochte used it to make fun of me," Mendoza said in 2010. "Then they were giving George Brett a hard time because he had a slow start that year, so they told him, 'Hey, man, you're going to sink down below the Mendoza Line if you're not careful.' And then Brett mentioned it to Chris Berman from ESPN, and eventually it spread and became a part of the game." Berman deflects credit back to Brett in popularizing the term. "Mario Mendoza?—it's all George Brett," Berman said. "We used it all the time in those 1980s SportsCenters. It was just a humorous way to describe how someone was hitting."

...
Wikipedia