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) completion of the Career Grand Slam. The major tournament at which the Career Grand Slam was achieved is indicated in bold. Eight men have won all four grand slam tournaments. Two of the eight men achieved a double career Slam. Originally, the grand slams were held on grass (Australian, Wimbledon, and US Open) and clay (French) and the first four players achieved their grand slams on two surfaces. The US Open changed its surface from grass to clay in 1975 and then to hard court in 1978. The Australian Open changed from grass to hard court in 1988. The last