Hart, rated the world’s top women’s tennis player in 1951, died at her home in Coral Gables, Florida.
The American, who was inducted into the Hall of Fame in 1969, became the first player in tennis history to complete a career boxed set, triumphs in all four Grand Slam events in singles, doubles and mixed doubles.
The only other players to achieve the feat, men or women, are Margaret Court Smith and Martina Navratilova.
Hart won six Grand Slam singles titles, including the 1949 Australian crown, the 1950 and 1952 French championships and the 1954 and 1955 US titles as well as enjoying one of the greatest single days in Wimbledon history in taking the 1951 title.
Because of rain delays, Hart won the women’s singles and doubles and mixed doubles crowns all on the same day, dropping only one set in the effort. She also swept three trophies in France in 1952 and the US in 1954.
Hart also lost in 12 Grand Slam singles finals between 1946 and 1953.
From 1946 to 1955 she was never lower than fourth in the world rankings of the era as she won 325 career tournament titles, 35 of them Grand Slams.
Hart captured 14 women’s doubles Grand Slam titles, five in France and four each at the US and Wimbledon, and 15 mixed doubles Grand Slam trophies, including five in a row from 1951-1955 at the US and Wimbledon.
Hart won 11 major doubles crowns with Hall of Famer Shirley Fry-Irvin, including four in a row at Roland Garros from 1950-1953 in a run in which they dropped only one set.
Eight of her mixed doubles titles were won alongside Australian Frank Sedgman and seven were won with fellow American Vic Seixas.