Steffi Graf is a German former tennis player, who was ranked world No. 1 during her career. Graf won 22 Grand Slam singles titles. This put her second on the list of Major wins in the female competition since the introduction of the Open Era in 1968 and she is third all-time behind Margaret Court and Serena Williams. In 1988, she became the first and only tennis player (male or female) to achieve the Golden Slam by winning all four Grand Slam singles titles and the Olympic gold medal in the same calendar year. Furthermore, she is the only tennis player to have won each Grand Slam event at least four times.

Graf was ranked world No. 1 by the Women's Tennis Association (WTA) for a record 377 total weeks—the longest period for which any player, male or female, has held the number-one ranking since the WTA and the Association of Tennis Professionals began issuing rankings. She won 107 singles titles, which ranks her third on the WTA's all-time list after Martina Navratilova (167 titles) and Chris Evert (157 titles). She and Margaret Court are the only players, male or female, to win three grand slams in a calendar year five times (1988, 1989, 1993, 1995 and 1996). She retired in 1999 and was inducted into the Tennis Hall of Fame in 2004.

Graf is regarded by many to be the greatest female tennis player of all time. In December 1999, Graf was named the greatest female tennis player of the 20th century by a panel of experts assembled by the Associated Press. In March 2012, Tennis Channel picked Graf as the greatest female tennis player ever in their list of 100 greatest tennis players of all time. In November 2018, Tennis.com polled its readers to choose the greatest women's tennis player of all time and Graf came in first.

In 1998 Grant founded Children For Tomorrow, a non-profit organization with the goal of helping children and families who are victims of war, persecution and violence. The Foundation offers children help in processing traumatic experiences of violence and “psychological rebuilding”. Graf is married to fellow tennis great and Grand Slam champion Andre Agassi.

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