The WTA Finals is the season-ending championship of the WTA Tour. It is the most significant tennis event in the women's annual calendar after the four majors, as it features the top eight singles players and top eight doubles teams based on their results throughout the season.

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".