Overview

• Each team starts with two challenges, keeps successful ones, and receives one if empty entering extra innings.
• Only the pitcher, catcher or batter may challenge immediately after a call, with no assistance from the dugout.
• Twelve Hawk-Eye cameras feed decisions over a T-Mobile private 5G network, with animated results shown on ballpark boards and broadcasts.
• MLB defines a 2D zone 17 inches wide, with the top at 53.5% of a batter’s height and the bottom at 27%.
• Spring training trials averaged about 4.1 challenges per game, a 52% overturn rate and roughly 13–15 seconds per review; the 11-member committee approved the system despite a non-unanimous players’ vote.