在2026赛季刚开始的一周后，MLB在经历多年低级别联赛测试并在2025年春训完成季前评估后，首次在大联盟正式引入ABS robo-umps。系统基于Hawk-Eye Innovations的摄像系统，每个球场可达每秒300帧，从多个角度追踪投球速度、旋转和到捕手手套的路径，以亚厘米级精度判断球是否在击球区内。其设计是尽量不干预：每队起始仅有两次挑战机会，且只有打者、投手或捕手可以发起回看。

早期示例同时显示了“修正”与“逆转”的作用。纽约洋基队主场周一比赛中，Giancarlo Stanton 挑战了一个看似边界的判罚，ABS 判定该球实际上位于好球带下方不足1/10英寸，并推翻了人工击球手判定。另一场比赛中，捕手的挑战让巴尔的摩金莺受益，因为原本叫作球的判定被改为好球，这也是MLB历史上首场由机器裁决结束的比赛。球迷和球员围绕复查也出现了强烈情绪；与此同时，传统派担忧依旧存在——这项运动原本依赖可变、可解释的“人工特性”，但机器正在决定以前由裁判经验处理的边界。

这些案例指向更广泛趋势：尽管争议由AI参与，人类仍掌握主动权，因为复查只在球员分秒之间发起。ABS同时产生了新的大样本统计：顶级裁判已处理成百上千次判球，却仅在少数情况下被挑战，其中若干记录显示推翻率为0%。因此，这项技术更像人类即时判定的备份与过滤层，而非替代。随时间推移，ABS的新奇感很可能褪去，机器裁决最终可能只是这项仍由人主导运动中的一个新变量。

MLB has introduced ABS robo-umps one week into the 2026 season after years of testing in lower leagues and a preseason rollout in spring 2025. The system uses Hawk-Eye Innovations cameras at up to 300 frames per second and with sub-centimeter precision to track pitch speed, spin, and trajectory to the catcher’s glove in order to determine whether a pitch is in the strike zone. It is designed to be minimally intrusive: each team starts with only two review challenges, and only the batter, pitcher, or catcher may request a review.

Early examples show both correction and reversal effects. In a New York Yankees game, Giancarlo Stanton challenged a near-boundary call; ABS ruled the pitch to be less than one-tenth of an inch below the strike zone and overturned the human call. In another game, a catcher challenge benefited the Baltimore Orioles when a called ball was reclassified as a strike, making it MLB’s first game decided by a machine judgment. Fan and player reactions around reviews have been intense, while traditionalist concerns remain: a sport long tied to interpretive human judgment is now sharing ambiguous, previously subjective boundaries with machine decisions. (Key numbers: 1/10)

These cases indicate a broader trend. Even with machine involvement, humans retain control because reviews are initiated by players in split seconds. ABS has also produced large-sample umpire statistics: top umpires have handled hundreds of calls but have faced only few reviews, with some reporting a 0% overturn rate. So the technology is acting more as a backup and filter for real-time human judgment than as replacement. As novelty fades, ABS is likely to become another routine variable in this still-human game rather than its dominant logic.