What is the meaning of calendar grand slam?

Answer 1

A Grand Slam (or Calendar-Year Slam) occurs when a tennis player wins all four major annual tennis tournaments (Australian Open, French Open, Wimbledon, and US Open) in the same year.

This is extremely difficult to achieve. In the history of men's tennis, only two people have ever completed the slam in a single year. Don Budge did it in 1938, but at a time when only amateurs could play in the Slam events. Rod Laver did it twice, in 1962 as an amateur, and in 1969 as a professional. (The main show court at the Australian Open is now called "Rod Laver Arena" in his honor) No player has done it since 1969; the field of players has grown so strong that it is nearly impossible to replicate.

In the women's circuit, three players have managed a calendar Slam; Maureen Connolly (1953), Margaret Court (1970), and Steffi Graf (1988). Graf's Slam was special; in addition to the four major tournament victories, she won the Olympic gold medal in women's tennis in the same year, leading some to call her's the "Golden Slam."