PHOENIX -- Major League Baseball isn't done tinkering with potential rule changes for the sport.
The league announced a series of experimental rules Tuesday that will be used in the Atlantic League this season, including a designated pinch runner, "double-hook" designated hitter rule and further limitations on a pitcher's ability to make pick-off moves.
The designated pinch runner rule allows a player who is not in the starting lineup to be used at any point of the game as a substitute baserunner. The player who was subbed out, as well as the pinch runner, would still be able to return to the game.