Doris Hart was an American tennis player who was active in the 1940s and first half of the 1950s. She was ranked world No. 1 in 1951. She was the fourth player, and second woman, to win a Career Grand Slam in singles. She was the first of only three players to complete the career "Boxed Set" of Grand Slam titles, which is winning at least one title in singles, doubles, and mixed doubles at all four Grand Slam events. Only she and Margaret Court achieved this during the amateur era of the sport.

The Grand Slam in tennis is the achievement of winning all four major championships in one discipline in a calendar year. In doubles, a Grand Slam may be achieved as a team or as an individual with different partners. Winning all four major championships consecutively but not within the same calendar year is referred to as a "non-calendar-year Grand Slam", while winning the four majors at any point during the course of a career is known as a "Career Grand Slam".