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The four Grand Slam tournaments, also called the Majors,[1] are the most important tennis events of the year in terms of world ranking points, tradition, prize-money awarded, and public attention. They are the Australian Open, the French Open, Wimbledon, and the US Open, played in that order. Both the Australian Open and the US Open are played on hard courts, while the French Open is played on clay, and Wimbledon is played on grass.

The Open Era of tennis began in 1968 when the Grand Slam tournaments agreed to allow professional players to compete. Wimbledon, the first of the Grand Slams, began in 1877, followed by the US Open (1881), the French Open (1891), and the Australian Open (1905). Beginning in 1905 and continuing to the present day, all four grand slams have been played yearly, with the exception of the 1st and 2nd World Wars and 1986 for the Australian Open. The Australian Open is the 1st Grand Slam of the year (January), followed by the French Open (May-June), Wimbledon (June-July), and US Open (August-September). Winning both Wimbledon (on grass) and the French Open (on clay), back-to-back, is quite an achievement considering the traditional difference between the court surfaces and the fast turnaround time between the tournaments.

In modern years, the Grand Slams have begun to add instant replay, giving the players the ability to challenge calls. The US Open was to the first to allow this in 2006.[2] Both the US Open and Australian Open also feature night matches played under the lights. The US Open was the first to feature night matches and also features the most night matches of any Grand Slam. The US Open is the only Grand Slam to have a tie-breaker in the 5th set of Men's Single's play, whereas in all the other Grand Slams players play out the 5th set (until one player leads by 2 games)

A singles player or doubles team that wins all four Grand Slam tournaments in the same year is said to have achieved the "Grand Slam". If the player or team wins all four consecutively, but not in the same calendar year, it is called a "Non-Calendar Year Grand Slam". Winning all four at some point in a career, even if not consecutively, is referred to as a "Career Grand Slam". Winning the four Majors and a gold medal in tennis at the Summer Olympics has been called a "Golden Slam" since 1988,[3] when Steffi Graf became the only person to accomplish that feat in a single calendar year. Andre Agassi and Rafael Nadal have accomplished a "Career Golden Slam", winning all five events but not in the same calendar year.[4]
Source: http://en.wikipedia.org/wiki/Grand_Slam_%28tennis%29