99% Invisible

RoboUmp Hits the Big Leagues

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Apr 14, 2026
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ANECDOTE

Liván Hernandez Benefited From A Phantom Strike Zone

  • Liván Hernández’s 15-strikeout gem in the 1997 NLCS was remembered as dominant partly because umpire Eric Gregg kept calling pitches far outside the zone strikes.
  • Chris Berube and Katie Nolan rewatched the game and saw a “never-ending” outside corner that likely changed the series.
INSIGHT

Baseball Tolerates A Huge Number Of Wrong Calls

  • MLB umpires get about 94 to 97 percent of strike calls right, yet one 2018 study still found roughly 14 missed calls per game, or 34,000 a year.
  • Chris Berube argues those misses matter because a single blown strike can swing careers, playoff series, and championships.
INSIGHT

Robot Umpires Already Existed As Broadcast Tech

  • Modern “robot umpires” are not robots at all but camera-based tracking systems derived from missile-tracking technology already installed in MLB parks.
  • Fans see pitch charts on TV, so human umpires now look uniquely underinformed compared with the audience judging them.
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