Who was the first to win a "boxed set" of Grand Slam titles in the Grand Slam tennis events?

Doris Hart (June 20, 1925 – May 29, 2015) was a World No. 1 American tennis player who was active in the 1940s and first half of the 1950s and was ranked No. 1 in 1951. She became the fourth player to win a Career Grand Slam in singles, the second woman to do so.

Hart won 35 Grand Slam titles during her career, tying with Brough for fifth on the all-time list. Six of her titles were in women's singles, 14 in women's doubles, and 15 in mixed doubles. Hart is one of three players, all women, to have a "boxed set" of Grand Slam titles—every possible title (singles, doubles, and mixed doubles) from all four Grand Slam events. The others are Margaret Court and Martina Navratilova. She was also the first to do so in history and only one of two to achieve this in the amateur era of the sport.

Hart won nine consecutive Grand Slam women's doubles titles from 1951 through 1953, with her streak of 43 consecutive match wins in Grand Slam women's doubles tournaments finally ending in the 1954 Wimbledon final. Hart was the champion of the last Grand Slam singles tournament she played, the 1955 U.S. Championships. Hart published an autobiography in 1955, "Tennis with Hart".