List of Major League Baseball single-season records

This is a list of single-season records in Major League Baseball.

Home runs

 * Most Grand Slams By a Pitcher in One Season: Tony Cloninger, Madison Bumgarner, 2

Live-ball era (1920–present)
(if different from above)

Catcher records
Both of Ruiz's no-hitters were by Roy Halladay; the second was in Game 1 of the National League Division Series, Halladay's first career postseason start. Both of Ramos' no-hitters were by Max Scherzer.
 * Most runners caught stealing: Jody Davis, 89 (1986)
 * Most stolen bases allowed: Mike Piazza, 155 (1996)
 * Highest caught-stealing %: Mike LaValliere, 72.73% (1993)
 * Most no-hitters caught: 2, Carlos Ruiz (2010) and Wilson Ramos (2015) (List of Major League Baseball no-hitters)

In 1914, Yankees catcher Les Nunamaker threw out three runners in the same inning.