Steffi Graf plays tennis.
The Grand Slam tournaments , also called majors , are the four most-important annual tennis events . Steffi Graf . 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 . 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 ) . Graf is regarded by some to be the greatest female tennis player of all time .