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) singles player to win four consecutive major titles, no matter the time of completion. Although groups variously identified as the Men's International Professional Tennis Council, "abetted primarily by some British tennis writers", and "European tennis journalists" had advocated for the ITF to change the definition of "Grand Slam", ITF General Secretary David Gray made it clear that this was not going to happen. In a 1983 letter to tennis journalist Paul Fein, Gray clarified: The ITF's plan was to offer the cash bonus for three years, apparently to encourage players to compete in all four major tournaments as much as