Steffi Graf is a former professional tennis player from Germany who is widely regarded as one of the greatest female tennis players of all time. She won 22 Grand Slam singles titles, the most in the Open Era, and was the first and only tennis player to achieve the Golden Slam by winning all four Grand Slam singles titles and the Olympic gold medal in the same calendar year. She also won 107 singles titles, which ranks her third on the WTA's all-time list after Martina Navratilova and Chris Evert.