What Is a Grand Slam in Tennis? The Four Majors Explained

Every tennis season the sport narrows, four times over, to a single fortnight where the whole game seems to hold its breath. Careers are measured by these weeks. If you have ever watched a final and heard the commentator murmur that this is a player's shot at history, they were almost certainly talking about a Grand Slam. So what is a Grand Slam in tennis, and why does the phrase carry so much weight?

What is a Grand Slam in tennis?

A tennis Grand Slam is one of the four biggest tournaments in the calendar: the Australian Open, the French Open, Wimbledon and the US Open. They are also called the majors, and they sit above everything else the tour offers. They last two weeks rather than one, they award the most ranking points and prize money, and they are the only events played over the best of five sets in the men's singles, which is part of why they feel like such a test of nerve and stamina.

Confusingly, the same phrase is used in two ways. A single major title is often described as "a Grand Slam", as in "she won her first Grand Slam in Paris". But strictly speaking, the Grand Slam is the feat of holding all four majors, a distinction we will come back to. For now, the simple version is the useful one: win one of these four tournaments and you have won a major.

The four Grand Slam tournaments

What makes the majors so compelling is that no two are alike. Each has its own month, its own surface and its own character, so a champion has to prove themselves on entirely different ground through the year. If you play yourself, it is worth remembering that the surface changes everything about how the ball behaves, which is why choosing the right shoes for the surface matters as much for a club player as it does for a professional.

A close-up of bright yellow tennis balls, the kind used across the four Grand Slam tournaments
Four tournaments, four surfaces, and even four different official balls.

The Australian Open (January, hard court)

The season opens in the Melbourne heat on a cushioned hard court. It is the youngest of the majors in feel, modern and fast-moving, and the summer conditions can make it one of the most physically brutal fortnights of the year.

The French Open, or Roland Garros (late May, clay)

Paris in early summer brings the only major played on clay. The red dirt slows the ball down and kicks it up high, rewarding patience, heavy topspin and a willingness to grind out long, lung-bursting rallies. It is the endurance test of the four.

Wimbledon (late June, grass)

The oldest tournament in the sport, first played in 1877, and the only major still contested on grass. The low, skidding bounce and the all-white dress code give it a character all its own. For many fans, Wimbledon simply is tennis.

The US Open (late August, hard court)

The season's final major closes things out in New York under floodlights and a famously noisy crowd. Played on hard courts like Melbourne, it has a bold, showbusiness energy that feels a world away from the hush of Centre Court.

How many Grand Slams are there, and why do some say five?

There are four Grand Slams, full stop. If you have ever searched for "the 5 Grand Slams", the confusion is understandable, because a couple of other events get called the "fifth Slam" as a compliment rather than a fact. The season-ending Tour Finals, which gather only the year's top eight, are sometimes given the nickname, and the Indian Wells Masters is another regular candidate. Neither is an official major, and nor is Olympic tennis, prestigious as it is. When the record books talk about majors, they mean the four and only the four.

What each Grand Slam plays with

Here is a detail even keen fans sometimes miss: the four majors do not all use the same ball. Wimbledon has played with Slazenger balls since 1902, one of the longest partnerships in sport. The Australian Open uses Dunlop, while the French Open and the US Open are both Wilson tournaments. It is not just branding, either. A ball is tuned to its surface and its climate, and players can feel the difference the moment they start hitting. If you have ever wondered why one tube feels livelier than another, our tennis balls buying guide explains what actually changes from ball to ball.

A Dunlop Australian Open 2025 Tennis Balls - 4 Ball Tube stands upright with its blue and white label next to a bright yellow ball marked “AO” and the Dunlop logo, representing top tournament quality from Dunlop.
Slazenger at Wimbledon, Dunlop in Melbourne, Wilson in Paris and New York.

Career Grand Slam, calendar Grand Slam and the Golden Slam

This is where the phrase earns its grandeur. Winning all four majors is the summit of the sport, but there are different ways to get there.

A career Grand Slam means winning all four majors at some point across your career, not necessarily in the same year. It is a rare achievement even so. In the men's game only a handful have managed it, among them Rod Laver, Andre Agassi, Roger Federer, Rafael Nadal and Novak Djokovic.

A calendar Grand Slam is the truly mythical one: winning all four in a single year. It has happened only a few times in the entire history of the sport. Don Budge did it in 1938, and Laver managed it twice, in 1962 and again in 1969. On the women's side, Maureen Connolly, Margaret Court and Steffi Graf have each done it. No one has completed a calendar Slam in singles for decades, which tells you how brutally hard it is.

Rarest of all is the Golden Slam: all four majors plus Olympic singles gold in the same calendar year. Only Steffi Graf, in her extraordinary 1988 season, has ever done it.

Who has won the most Grand Slams?

Novak Djokovic holds the men's singles record with 24 major titles, ahead of Rafael Nadal on 22 and Roger Federer on 20, the three of them having shared out most of the majors for two remarkable decades. In the women's game, Margaret Court sits top of the all-time list with 24, a total spanning the amateur and professional eras, while Serena Williams holds the Open era record with 23 and Steffi Graf follows on 22.

The story now belongs to a younger generation. Carlos Alcaraz and Jannik Sinner have taken the baton from the old guard, trading the biggest titles between them and already collecting several majors each while still in their early twenties. Working out who eventually challenges Djokovic's record is one of the great pleasures of following the sport over the coming years.

Why the majors still matter

The Grand Slams endure because they ask a bigger question than any other event. Not just who is playing well this week, but who can hold their game together across two weeks, on four different surfaces through the year, with the whole sport watching. That is why a single major title can define a career, and why holding all four at once is spoken of in almost reverent tones. Understanding what a Grand Slam really means turns each of those fortnights from a tournament into a piece of history in the making.