Steffi Graf is a retired German professional tennis player who won 22 Grand Slam singles titles, the second-most in women's singles since the start of the Open Era in 1968 and the third-most of all-time. 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. She won 107 singles titles, which ranks her third on the WTA's all-time list after Martina Navratilova and Chris Evert. 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). Graf 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, she 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: Graf came in first.

In 1998, Graf, who is married to fellow tennis great and Grand Slam champion Andre Agassi, founded Children For Tomorrow, a non-profit organization with the goal of helping children and families who are victims of war, persecution and violence.

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