The Grand Slam tournaments, also called majors, are the four most-important
annual tennis events. They offer the most ranking points,[1] prize money, public and media attention,
the greatest strength and size of field, and greater number of "best of" sets for men. The Grand Slam
itinerary consists of the Australian Open in mid January, the French Open in May and
June, Wimbledon in June and July, and the US Open in August and September. Each tournament is
played over a period of two weeks. The Australian and United States tournaments are played
on hard courts,[a] the French on clay, and Wimbledon on grass. Wimbledon is the oldest, founded in
1877, followed by the US in 1881, the French in 1891, and the Australian in 1905. However, of these
four, only Wimbledon was a major before 192425, the time when all four became designated Grand
Slam tournaments. Skipping Grand Slam tournamentsespecially the Australian Open because of
the remoteness, the inconvenient dates (around Christmas and New Year's Day) and the low prize
moneywas not unusual before 1982, which was the start of the norm of counting Grand Slam
titles.
Grand Slam tournaments are not operated by the Association of Tennis Professionals (ATP) or
the Women's Tennis Association (WTA), which were formally founded in 1972 and 1973
respectively, though the ATP and WTA do award ranking points based on a player's performance at
a major.