Major League Baseball sent a memo to teams clarifying this year's experimental rule intended to limit collisions at home plate, saying runners should not be called safe if the ball clearly beats them.FILE - In this July 31, 2014, file photo, Cincinnati Reds' Zack Cozart (2) protests to home plate umpire Mike Winters, right, as he scores the game-tying run on a sacrifice fly by Todd Frazier against the Miami Marlins in the eighth inning of a baseball game in Miami. Cozart was originally called out by Winters. After a 6-minute, 10-second review, the call was overturned, and Ryan Ludwick followed with a two-run single that sent the Reds onto a 3-1 win. Major League Baseball has sent a memo to teams clarifying this year's experimental rule intended to limit collisions at home plate, saying runners should not be called safe if the ball clearly beats them to the plate.FILE - In this Aug. 13, 2014, file photo, Chicago White Sox catcher Tyler Flowers, right, reaches to tag San Francisco Giants' Gregor Blanco, who was originally ruled out at home but then ruled safe after review, during the seventh inning of a baseball game in San Francisco. Major League Baseball has sent a memo to teams...