MLB's Automated Ball-Strike challenge system is again part of spring training, but unlike last year, it will remain once the regular season starts. It's about to profoundly change baseball. K.C.

A scoreboard shows an ABS challenge in spring training. MLB is comfortable with the system's margin of error. But not all players or umpires are quite as comfortable ...

Major League Baseball umpires are being forced to adjust to a new world behind home plate, where players can challenge their ...

The New York Yankees' José Caballero lost the first challenge taken to Major League Baseball's so-called robot umpire, unsuccessfully appealing a strike by San Francisco Giants right-hander Logan Webb ...

On the outskirts of Beijing, young Chinese entrepreneur Cheng Hao sits on an indoor soccer pitch – but this turf isn’t for humans. It’s where engineers working for his start-up, Booster Robotics, ...