For the uninformed, an unassisted triple play in baseball is when a single player gets three opposing players out in one play. It has happened only 15 times in the history of major league baseball.
It happened yesterday in Philadelphia against the NY Mets. Watch it:
Of course, if you’ll notice carefully, the Mets played a big role in setting up this play. The two players on first and second were trying to pull off a double steal, which enabled the defensive player to quickly get the last two outs.