Nicolas James Lentz (born December 28, 1989) is an American umpire in Major League Baseball.

[4] On August 31, 2018, Lentz ejected New York Yankees' manager Aaron Boone.

Boone, who had been in the dugout, was displeased with a strike call Lentz made during a Gleyber Torres at-bat.

Boone came on to the field and became quite animated, including crouching behind home plate in a catcher's stance, apparently demonstrating to Lentz the difference between balls and strikes.

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