Suzanne Rachel Flore Lenglen was a French tennis player. She was the inaugural world No. 1 from 1921 to 1926, winning eight Grand Slam titles in singles and twenty-one in total. She was also a four-time World Hard Court Champion in singles, and ten times in total. Lenglen won six Wimbledon singles titles, including five in a row from 1919 to 1923, and was the champion in singles, doubles, and mixed doubles at the first two open French Championships in 1925 and 1926. In doubles, she was undefeated with her usual partner Elizabeth Ryan, highlighted by another six titles at Wimbledon. Lenglen was the first leading amateur to turn professional. She ranked as the greatest women's tennis player from the amateur era in the 100 Greatest of All Time series on the Tennis Channel in 2012.

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".