MLB Weird Rules & Rare Plays

A Grand Slam is the only way to score four runs on a single swing of the bat in baseball. It occurs when the bases are loaded—meaning there are runners on first, second, and third base—and the batter hits a home run. This allows all three base runners and the batter to score, resulting in four runs total.

A walk-off play in baseball, such as a walk-off home run, is where the hitting team scores the winning run in their final at-bat in the bottom of the last inning of the game, thus ending the game instantly in their favor and wins.

The term "walk-off" originated because once the play occurs, the fielding team can walk off the field, as the game's outcome is decided.

When a pitcher commits a balk, all baserunners on the offensive team are permitted to advance one base. The rule is in place to prevent pitchers from deceiving the runners on base, adding an extra layer of strategy for both teams.

In baseball, a Closer is the relief pitcher given the task to finish the game in the final innings. 

Closers are often players with exceptional fastball speed or unique pitching skills, capable of dealing effectively with pressure scenarios.

In baseball, an Unassisted Triple Play is one of the rarest feats, commonly performed by an infielder. It involves catching a line drive, then tagging a runner, and finally stepping on a base to catch an advancing runner. 

However, receiving a pass from an outfielder would involve a second player's action and therefore, cannot be part of an Unassisted Triple Play.