A Grand Slam in tennis usually means winning all four major tournaments : the Australian Open, the French Open, Wimbledon, and the US Open in the same calendar year. These four events are also called the sport’s majors.

Quick Scoop

A player can also hear the term used in a few related ways:

  • Calendar-year Grand Slam: winning all four majors in one year.
  • Career Grand Slam: winning each of the four majors at least once over a career.
  • Non-calendar-year Grand Slam: winning the four majors in a row across two seasons.

Why it matters

The Grand Slams are the most prestigious tournaments in tennis and carry the most attention, ranking points, and prize money. Because they’re played on different surfaces and at different times of year, winning all four is extremely rare.

If you want, I can also give you a super short kid-friendly explanation or a list of the four tournaments with their surfaces.