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
Athens Olympic Tennis Centre Grand Slam event. The Main Court, in particular, is extremely large by the standards of major tennis competitions, with the seats being relatively far removed from the tennis court. The centre hosted the tennis matches at the 2004 Summer Olympics in Athens, Greece. The centre was completed in February 2004, and officially opened on August 2, 2004. In 2017, the Greek Basket League club, AEK Athens, revealed their plans to acquire the Main Court facility, in order to transform it into their home indoor basketball hall, with a spectator capacity for basketball games, of 9,500-10,000 seats. Athens Olympic Tennis Centre