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
Tennis in Germany and 1984 (women). Singles ATP and WTA performances since 1973. The lists include only players who have reached at least a singles Grand Slam, ATP/WTA Finals or Olympic semifinal and refer to the Open Era. The lists include only players who have reached at least a doubles Grand Slam, ATP/WTA Finals or Olympic final and refer to the Open Era. Tennis in Germany Tennis is one of the most popular sports in Germany with more than five million active players. The German Tennis Federation is the largest tennis federation in the world with ca. 1.4 million members. Statistics based on