Major League Baseball launches its experimental automated ball-strike challenge system starting with the Yankees-Giants opener. Players—pitcher, catcher, or hitter—get two initial challenges per game to contest umpire calls immediately post-pitch. Teams retain the ability to challenge after a win, but lose the right entirely after two unsuccessful attempts during the contest.

Extensive minor league and spring training testing provided insight into usage patterns. Defense teams proved more successful in overturning calls during the exhibition season, succeeding 60% of the time compared to 45% for batters. Executives expressed particular concern over the calibration of the strike zone's top boundary, with player height measurements taken specifically to address this.

Team strategy regarding who challenges remains divided; ten executives surveyed indicated they would actively discourage pitchers from using their own challenges. Many believe pitchers land in positions post-throw that impede accurate assessment of the call. Successfully overturning calls late in games will become difficult once a team burns through its initial two challenges allotment.

Spring data showed the Chicago Cubs hitters held the best overturn rate at 65% for their challenges, while the St. Louis Cardinals led defensive success at 75%. The league faces immediate questions about strategic deployment, especially in high-leverage, late-inning situations where teams might desperately need a review.