Major League Baseball announced that a variety of playing rules will be tested during the upcoming 2021 Minor League season.
The experimental playing rules were approved by the Competition Committee and the Playing Rules Committee. MLB will closely monitor and analyze the impact of each rule change throughout the year.
The rule changes being tested are designed to improve the pace and length of games, increase action on the basepaths, create more balls in play and reduce player injuries.
Triple-A rule changes
At the Triple-A level, the size of first, second and third base will be increased from 15 inches square to 18 inches.