With Friday's news that the independent Atlantic League -- as part of its new partnership with Major League Baseball -- will implement several rules changes for 2019, let's look closer at four of the major proposals and how likely they are to make their way from independent baseball to the major leagues:
Jump to each potential baseball rule change: Robo umps! | End of the shift | Three-batter minimum | Moving the mound back
Robot umpires
The rule change: Using TrackMan radar to help umpires call balls and strikes.