Ending to Brewers' Game 2 World Series win shines spotlight on pitfalls of new check-swing system

The Brewers defeated the Rays 5-4 in Game 2 of the World Series, with the decisive moment coming when umpire James Hoye ruled that Yandy Díaz swung on a check swing with the tying run at third base in the ninth inning. The controversial call has renewed discussion about implementing an automated check-swing challenge system, which is currently being tested in minor leagues and uses a 45-degree angle as the threshold for determining whether a swing occurred. When the ACS technology was applied retroactively to Díaz's at-bat, it indicated he did not swing, highlighting potential flaws in the system's parameters and MLB's lack of a formal definition for what constitutes a check swing.

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