Among the highlights of the new system:
• If a team enters extra innings without a challenge, they'll be given an extra one every inning. The challenges will not accumulate if not used. Teams will never have more than one challenge per extra inning unless they entered extra frames with their original two intact.
• A pitch may not be challenged if a position player is pitching.
• The league is measuring the standing height of each player to determine their individual strike zone, which will be slightly smaller than the umpire called zone.
• It's possible for both an ABS challenge and video replay challenge to occur on the same play. If that happens, the ball-strike call will be adjudicated first, followed by the video replay on the bases.