Stefanie Maria Graf is a former World No. 1 ranked female tennis player from Germany. Graf is widely considered to be one of the greatest female tennis players in history. Graf won 22 Grand Slam singles titles, second among male and female players only to Margaret Smith Court's 24. She also won 107 singles titles, which ranks her third on the list of most singles titles won during the open era, behind Martina Navratilova (167 titles) and Chris Evert (154 titles). In December 1999, Graf was named the greatest female tennis player of the 20th century by a panel of experts assembled by The Associated Press. Tennis writer Steve Flink, in his book The Greatest Tennis Matches of the Twentieth Century, named her as the best female player of the 20th century.