Steffi Graf is an athlete.
The Grand Slam tournaments , also called majors , are the four most-important annual tennis events . Steffi Graf . Graf won 22 Grand Slam singles titles . 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 . Consequently , Graf 's Grand Slam was achieved on grass , clay , and hard court while the previous five Grand Slams were decided on only grass and clay .