The ABS Challenge System is exposing the worst umpire in baseball

During Wednesday's game between the Tampa Bay Rays and the Milwaukee Brewers, umpire CB Bucknor took a foul ball to the mask and had to be helped off the field. It was the cap to what has been a particularly bad week for one of the most controversial umpires in baseball.

It started with perhaps the best example of how MLB's Automated Ball-Strike (ABS) Challenge System can inject drama in baseball. This is the first year for the new robot umpire, which allows hitters, catchers, and pitchers to challenge balls and strikes for the first time. Each team starts a game with two challenges. But they only lose a challenge if it's unsuccessful, so p …

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