High Quality Content by WIKIPEDIA articles! Stefanie Maria Graf (born June 14, 1969, in Mannheim, Baden-Württemberg, West Germany) is a former World No. 1 female tennis player from Germany. Graf won 22 Grand Slam singles titles, second among male and female players only to Margaret Court's 24. She is the only player to have won all four Grand Slam singles tournaments (Wimbledon, the US Open, the French Open and the Australian Open) at least four times each. In 1988, Graf 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.