The Varsity Reinventing America’s Favorite Pastime
Apr 1, 2026
Jeff Passan, ESPN’s senior MLB insider known for covering rule changes and league business, breaks down robo-ump rollout and why ABS challenges electrify fans. He digs into the pitch clock’s effect on pace, MLB’s A/B testing approach in the minors, and baseball’s shifting streaming landscape and World Baseball Classic momentum.
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Robo Umpires Boost Engagement And Game Moments
- ABS robo-ump system has been a clear early success that increases fan engagement by delivering fast, high-leverage overturned calls.
- Jeff Passan cites Eugenio Suarez challenges that turned strikeouts into plays and calls ABS “smashing success.”
Robo Umpires Have Measurable Margin Of Error
- The ABS system isn't perfect; MLB's confidence intervals show measurable margin of error around pitch placement.
- Passan notes MLB's 95% confidence ~0.4 inches and 99% ~0.5 inches, meaning many challenged pitches sit inside that uncertainty.
Minor Leagues Served As A/B Test Lab
- In Charlotte MLB tested ABS vs ABS+challenge in AAA to A/B test fan and player response.
- Passan recounts earpiece-based automated calls speeding games and the dopamine hit fans get from 15-second challenge resolutions.