Grand Slam (tennis) tennis ball, Martina Navratilova finally did it." Although the ITF recognizes what is now unofficially known as the "non-calendar year Grand Slam" on its Roll of Honour, no subsequent player to win four or more majors in a row—Steffi Graf, Serena Williams, or Novak Djokovic—has received bonus prize money. Combining "the" Grand Slam and non-calendar year Grand Slam, the total number of times that players achieved the feat (of being the reigning champion in all four majors) expands to 18. Three women have won four or more consecutive major titles since 1970, with Navratilova taking six in a row in
Grand Slam (tennis) Slam during the same streak. The career achievement of all four major championships in one format is termed a "Career Grand Slam" in that format. Dozens of players have accomplished that (column two) and 17 have doubled it: won a second championship in each of the four majors in one format (column three). Two or more career championships in all four majors is sometimes called a "Multiple Slam Set". Three players have Multiple Slam Sets in two formats, one in three formats, so 22 players are counted in the table (column three). Their achievements are tabulated below. Eight men and