In sports, the term "Grand Slam" has different meanings depending on the sport. In tennis, a Grand Slam refers to the achievement of winning all four major championships in one discipline in a calendar year. The four major championships, also known as majors, are the Australian Open, the French Open, Wimbledon, and the US Open. In doubles, a team may accomplish the Grand Slam playing together or a player may achieve it with different partners).

In baseball, a Grand Slam occurs when a batter hits a home run with men on first base, second base, and third base. Four runs score on a grand slam, and a batter is awarded four RBIs. Grand slams are rare and usually have a significant impact on the result of the game.

The term "Grand Slam" originated in the card game Bridge, where it refers to a player winning every trick. It carried over into baseball because it refers to a team scoring as many runs as possible in one at-bat.