court surface changed twice, from grass (1887–1974), to Har-Tru clay (1975–1977), to hard courts since 1978. No women's tennis player won the event on all three surfaces, and no women's tennis player won it on both grass and clay. Chris Evert was the only one to win the event on clay and on hard court, thereby making her the only woman to win on two different surfaces at the event. Finals Key U.S. National Championships US Open Statistics In the U.S. National Championships, under the challenge round format, Elisabeth Moore (1896, 1901, 1903, 1905) holds the record for most singles titles with four and Hazel Hotchkiss Wightman (1909–1911) holds the record for most consecutive women's singles titles at three. With four consecutive singles titles each, Molla Bjurstedt Mallory (1915–1918) and Helen Jacobs (1932–1935) hold the record for most consecutive women's singles titles won after the challenge round format was abolished. Bjurstedt Mallory's eight singles titles (1915–1918, 1920–1922, 1926) is the all-time record. During the US Open, since the inclusion of the professional tennis players, Chris Evert (1975–1978) holds the record for most consecutive women's singles titles at four and the record for most overall titles at six (1975–1978, 1980, 1982) with Serena Williams (1999, 2002, 2008, 2012–2014). This event has been won without losing a set during the open era by Margaret Court in 1969, Billie Jean King in 1971 and 1972, Evert in 1976, 1977 and 1978, Martina Navratilova in 1983 and 1987, Monica Seles in 1992, Steffi Graf in 1996, Martina Hingis in 1997, Lindsay Davenport in 1998, Venus Williams in 2001, Serena Williams in 2002, 2008 and 2014, Justine Henin in 2007 and Emma Raducanu in 2021. Multiple champions Champions by country See also US Open other competitions List of US Open men's singles champions List of US Open men's doubles champions List of US Open women's doubles champions List of US Open mixed doubles champions Grand Slam women's singles List of Australian Open women's singles champions List of French Open women's singles champions List of Wimbledon ladies' singles champions List of Grand Slam women's singles champions Notes References General Specific External links US Open official website Women US Open Women's tennis in the United States