The Atlantic League will move its mound back 12 inches from home plate during the 2021 season, according to the Washington Post's Jacob Bogage and Chelsea Janes.
The mound in the Atlantic League will now sit 61'6" from home plate. The change marks the first alteration to the professional mound since MLB lowered the mound prior to the 1969 season.
The Atlantic League is independent and not officially affiliated with MLB. But it has become a breeding ground for potential MLB rule changes in recent years, including the debut of robot umpires in 2019.