Stefanie Maria "Steffi" Graf (born 14 June 1969) is a former World No. 1 German tennis player.
In total, Graf won 22 Grand Slam singles titles, second among male and female players only to Margaret Court's 24.
Her 22 singles titles mark the record for most Grand Slam wins by a tennis player (male or female) since the introduction of the Open Era in 1968.
In 1988, she became the first and only tennis player (male or female) to achieve the Calendar Year Golden Slam by winning all four Grand Slam singles titles and the Olympic gold medal in the same calendar year.
Graf is regarded by some to be the greatest female tennis player of all time. Graf retired in 1999 while she was ranked World No. 3. She married former World No. 1 men's tennis player Andre Agassi in October 2001. Graf was inducted into the Tennis Hall of Fame in 2004.