施特菲·格拉芙，Stefanie Maria "Steffi" Graf is a German former professional tennis player. She was ranked world No. 1 for a record 377 weeks and won 22 Grand Slam singles titles, which ranks second since the introduction of the Open Era in 1968 and third all-time behind Margaret Court and Serena Williams. In 1988, she became the 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. Furthermore, she is the only tennis player to have won each Grand Slam tournament at least four times.