MLB and Atlantic League to Test Experimental Rules in 2023.
The Atlantic League will test three experimental rules during its 2023 season in partnership with Major League Baseball (MLB). The rules include a designated pinch-runner, a single disengagement limit for pitchers, and the "Double-Hook" designated hitter. The Atlantic League has served as a partner league of MLB for observations of inventive ideas. The defensive shift restrictions and bigger bases that arrived in the big leagues this year were first experimented in the Atlantic League prior to additional experimentation at the affiliated Minor League levels.