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 the majors, are the Australian Open, the French Open, Wimbledon, and the US Open). The term "Grand Slam" originates from the card game contract bridge, where it is used for winning all possible tricks, and entered tennis via golf, where it was used for the first time to specifically describe a total of four wins, specifically Bobby Jones achievement of winning the four major golf tournaments three years earlier in 1930).

It is important to note that the term "Grand Slam" is often colloquially used to describe the four major tournaments themselves or winning all four over the course of several years. However, technically, a Grand Slam is four major titles in a single season. Winning all four major championships during a players career but not necessarily in a single calendar year is referred to as a career Grand Slam.