What is the rarest play or occurrence in major league baseball.?
Others said a triple play without a ball touching a bat, a triple play in which the batter wasn't one of the outs, and hitting a grand slam in the first major league at bat.
It looks like the grand slam in the first at bat has happened 6 times but I'm not sure about the others.
I say it is hitting for the home run cycle as it has never occurred at the major league level; Ty Horn did it in AA ball back in 1998.
What do you think is the rarest play?