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
1981 Grand Prix (tennis) Jimmy Connors (USA) 4. José Luis Clerc (Arg) 5. Guillermo Vilas (Arg) 6. Björn Borg (Sue) 7. Roscoe Tanner (USA) 8. Eliot Teltscher (USA) 9. Vitas Gerulaitis (USA) 10. Yannick Noah (Fra) The list of winners and number of singles titles won, alphabetically by last name: The following players won their first title in 1981: 1981 Grand Prix (tennis) The 1981 Volvo Grand Prix was the only men's professional tennis circuit held that year. It consisted of the four Grand Slam tournaments and the Grand Prix tournaments. The World Championship Tennis (WCT) Tour was incorporated into the Grand Prix circuit.