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MLB Testing Automated Check-Swing Challenge System in Arizona Fall League

It’ll be a while before we see this at the highest level, but MLB is testing an automated check-swing challenge system during Arizona Fall League play. The first use of the new system took place Tuesday at Salt River Fields, with Mets prospect Drew Gilbert and Yankees prospect Garrett Martin successfully getting swing calls overturned.

Gilbert became the first guinea pig when he checked on a 3-1 pitch and started to remove his gear before third base ump Darius Ghani ruled it a swing. Gilbert immediately tapped his helmet to initiate a review and, as you can see below, the video board displayed evidence that he had drawn a walk.