What Is a Grand Slam in Baseball?

Cincinnati Reds' Rece Hinds reacts as he rounds the bases after hitting his career first MLB grand slam during the third inning.
(AP Photo/Jeff Dean)
  • A grand slam scores four runs.
  • Alex Rodriguez has hit the most grand slams in MLB history.
  • Thirteen players have hit two grand slams in a single game.

A grand slam inevitably has a massive impact on the live MLB betting markets. 

Hitters with the shortest baseball odds to win MVP are often more likely to hit grand slams due to their position in the batting order and their ability to hit home runs. 

What Is a Grand Slam in Baseball?

A grand slam is achieved when a home run is hit with players on all three bases. Four runs are scored from a grand slam (the three players on base and the hitter). 

The batter is credited with four RBIs. 

Which MLB Player Has the Most Grand Slams?

Alex Rodriguez holds the record for the most grand slams in MLB history with 25. The former New York Yankees infielder has two more than second-placed Lou Gehrig.

With 21, Manny Ramírez is the only other player with more than 19 career grand slams.

When it comes to World Series grand slams, a total of 23 have been hit, two of which were in the 2024 Fall Classic. 

MLB Hitters With Two Grand Slams in One Game

RankPlayerTeamOpponentYear
1Tony LazzeriNew York YankeesPhiladelphia Athletics1936
2Jim TaborBoston Red SoxPhiladelphia Athletics1939
3Rudy YorkBoston Red SoxSt. Louis Browns1946
4Jim GentileBaltimore OriolesMinnesota Twins1961
5Tony CloningerAtlanta BravesSan Francisco Giants1966
6Jim NorthrupDetroit TigersCleveland1968
7Frank RobinsonBaltimore OriolesWashington Senators1970
8Robin VenturaChicago White SoxTexas Rangers1995
9Chris HoilesBaltimore OriolesCleveland1998
10Fernando TatisSt. Louis CardinalsLos Angeles Dodgers1999
11Nomar GarciaparraBoston Red SoxSeattle Mariners1999
12Bill MuellerBoston Red SoxTexas Rangers2003
13Josh WillinghamWashington NationalsMilwaukee Brewers2009

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