I am not a Yankees fan, but they wuz robbed with a really bad call the other night against the Tigers. And that infield fly call during the Braves/Cardinals game was just awful. Why not a challenge system like tennis? Each manager would get one challenge. If he was wrong and the ump was correct, he'd lose it. If the ump missed it, the manager would keep it. I worry about slowing the game down even more, but perhaps just the one challenge wouldn't be too burdensome.