Martina Navratilova is a Czech-American former professional tennis player. Widely considered among the greatest tennis players of all time, Navratilova won 18 major singles titles, 31 major women's doubles titles, and 10 major mixed doubles titles, for a combined total of 59 major titles, the most in the Open Era. Alongside Chris Evert, her greatest rival, Navratilova dominated women's tennis for much of the 1970s and 1980s.

Stefanie Maria Graf is a German former professional tennis player. She won 22 major singles titles, the second-most in women's singles won since the start of the Open Era in 1968 and the third-most of all-time. In 1988, Graf became the first tennis player to achieve the Golden Slam by winning all four major singles titles and the Olympic gold medal in the same calendar year. She is the only tennis player, male or female, to have won each major singles tournament at least four times.