The US Open women's singles championship is an annual tennis event that has been held since 1887 as part of the US Open at the USTA Billie Jean King National Tennis Center in Flushing Meadows – Corona Park, New York City.
The US Open is played during a two-week period in late August and early September and has been chronologically the last of the four Grand Slam tournaments of the tennis year since 1987. The Philadelphia Cricket Club (1887–1920) and Forest Hills (1921–1977) hosted the event before it settled in 1978 at its current site. The United States Tennis Association is the national body that organizes this event.
The champion receives a full-size replica of the event's trophy engraved with her name. In 2022, the winner received prize money of US$2,600,000.
History
The format of the women's singles event has undergone several changes since the first edition. From 1888 through 1918, the event started with a knockout phase, the All-Comers singles, whose winner faced the defending champion in a challenge round. The All-Comers winner was awarded the title by default six times (1893, 1899, 1900, 1905, 1906 and 1907) in the absence of the previous year's champion. The challenge round system was abolished with the 1919 edition. Since 1887, all matches have been played as the best-of-three sets, except in the eleven-year period from 1891 until 1901, when the challenge round was scored the best-of-five-sets.
Format
Since 1887, the winner of the next game at five-games–all took the set in every match except the All-Comers final and the challenge round, which was won by the player who had won at least six games and at least two games more than his opponent. This advantage format was introduced for the final sets of early rounds, for women starting in 1887, and used for all sets in final rounds from 1887 through 1969. The tie-break system was introduced in 1970 for all sets, in its best-of-nine points sudden death version until 1974, and in its best-of-12 points lingering death version since 1975. The US Open is the only Grand Slam tournament to have a third set tie-break, which has occurred twice in women's singles finals in 1981 and in 1985. 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
{| class="wikitable"
|-
| Regular competition
|-
| style="background: #d0f0c0"|All Comers' winner, Challenge round winner ‡
|-
| style="background: #faecc8"|Defending champion, Challenge round winner †
|-
| style="background: #dAe4e6"|All Comers' winner, no Challenge round ◊
|}
U.S. National Championships
thumb|upright|alt=A woman in all white attire is hitting a forehand with the tennis racket in the right hand, which it is a black and white photograph|[[Elisabeth Moore is a four-time champion]]
thumb|upright|alt=A woman in all white attire is hitting a backhand with the tennis racket in the right hand, which it is a black and white photograph|[[Hazel Hotchkiss Wightman is a four-time champion]]
thumb|upright|alt=A brown-haired woman is wearing all white clothing, and is hitting a tennis shot.|[[Molla Bjurstedt Mallory's eight US singles championships is the all–time record among both men and women.]]
thumb|upright|alt=A woman looking away from the camera with a tennis racket in her right hand and a colored sweater on and all white clothing, which this picture is a black and white|[[Helen Wills Moody is a seven-time champion]]
<!-- WP:NFCC violation: thumb|upright|alt=A woman in a dark colored jacket and a white ensemble with a metal vase with flowers in the vase|[[Helen Jacobs was a four-time champion.]] -->
thumb|upright|[[Maureen Connolly|Maureen Connolly Brinker was a three-time champion]]
thumb|upright|alt=Margaret Court| [[Margaret Court is a five time champion]]
{|class="sortable wikitable"
|-
!Year
!Country
!Champion
!Country
!Runner–up
! class="unsortable"|Score
|-
| align=center|1887 || || || || || 6–1, 6–0
|-
| align=center|1888 || || style="background: #d0f0c0"| ‡ || || || 6–3, 6–5
|-
| align=center|1889 || || style="background: #faecc8"| † || || || 7–5, 6–2
|-
| align=center|1890 || || style="background: #d0f0c0"| ‡ || || || 6–2, 6–2
|-
| align=center|1891 || || style="background: #d0f0c0" | ‡ || || || 6–4, 6–1, 4–6, 6–3
|-
| align=center|1892 || || style="background: #faecc8" | † || || || 5–7, 6–3, 6–4, 4–6, 6–2
|-
| align=center|1893 || || style="background: #dAe4e6"| ◊ || || || 6–1, 6–3
|-
| align=center|1894 || || style="background: #d0f0c0"| ‡ || || || 7–5, 3–6, 6–0, 3–6, 6–3
|-
| align=center|1895 || || style="background: #d0f0c0"| ‡ || || || 6–4, 6–2, 6–1
|-
| align=center|1896 || || style="background: #d0f0c0"| ‡ || || || 6–4, 4–6, 6–2, 6–2
|-
| align=center|1897 || || style="background: #d0f0c0"| ‡ || || || 6–3, 6–3, 4–6, 3–6, 6–3
|-
| align=center|1898 || || style="background: #faecc8"| † || || || 6–3, 5–7, 6–4, 2–6, 7–5
|-
| align=center|1899 || || style="background: #dAe4e6"| ◊ || || || 6–1, 6–1, 7–5
|-
| align=center|1900 || || style="background: #dAe4e6"| ◊ || || || 6–2, 6–2, 6–0
|-
| align=center|1901 || || style="background: #d0f0c0"| ‡ || || || 6–4, 3–6, 7–5, 2–6, 6–2
|-
| align=center|1902 || || style="background: #d0f0c0"| ‡ || || || 6–1, 1–0, retired
|-
| align=center|1903 || || style="background: #d0f0c0"| ‡ || || || 7–5, 8–6
|-
| align=center|1904 || || style="background: #d0f0c0"| ‡ || || || 6–1, 6–2
|-
| align=center|1905 || || style="background: #dAe4e6"| ◊ || || || 6–4, 5–7, 6–1
|-
| align=center|1906 || || style="background: #dAe4e6"| ◊ || || || 6–4, 6–3
|-
| align=center|1907 || || style="background: #dAe4e6"| ◊ || || || 6–3, 6–2
|-
| align=center|1908 || || style="background: #d0f0c0"| ‡ || || || 6–3, 1–6, 6–3
|-
| align=center|1909 || || style="background: #d0f0c0"| ‡ || || || 6–0, 6–1
|-
| align=center|1910 || || style="background: #faecc8"| † || || || 6–4, 6–2
|-
| align=center|1911 || || style="background: #faecc8"| † || || || 8–10, 6–1, 9–7
|-
| align=center|1912 || || style="background: #d0f0c0"| ‡ || || || 6–4, 6–2
|-
| align=center|1913 || || style="background: #faecc8"| † || || || 6–2, 7–5
|-
| align=center|1914 || || style="background: #faecc8"| † || || || 6–2, 1–6, 6–1
|-
| align=center|1915 || || style="background: #d0f0c0"| ‡ || || || 4–6, 6–2, 6–0
|-
| align=center|1916 || || style="background: #faecc8"| † || || || 6–0, 6–1
|-
| align=center|1917 || || style="background: #faecc8"| † || || Marion Vanderhoef || 4–6, 6–0, 6–2
|-
| align=center|1918 || || style="background: #faecc8"| † || || || 6–4, 6–3
|-
| align=center|1919 || || || || || 6–1, 6–2
|-
| align=center|1920 || || || || || 6–3, 6–1
|-
| align=center|1921 || || || || || 4–6, 6–4, 6–2
|-
| align=center|1922 || || || || || 6–3, 6–1
|-
| align=center|1923 || || || || || 6–2, 6–1
|-
| align=center|1924 || || || || || 6–1, 6–3
|-
| align=center|1925 || || || || || 3–6, 6–0, 6–2
|-
| align=center|1926 || || || || || 4–6, 6–4, 9–7
|-
| align=center|1927 || || || || || 6–1, 6–4
|-
| align=center|1928 || || || || || 6–2, 6–1
|-
| align=center|1929 || || || || || 6–4, 6–2
|-
| align=center|1930 || || || || || 6–1, 6–4
|-
| align=center|1931 || || || || || 6–4, 6–1
|-
| align=center|1932 || || || || || 6–2, 6–2
|-
| align=center|1933 || || || || || 8–6, 3–6, 3–0, retired
|-
| align=center|1934 || || || || || 6–1, 6–4
|-
| align=center|1935 || || || || || 6–2, 6–4
|-
| align=center|1936 || || || || || 4–6, 6–3, 6–2
|-
| align=center|1937 || || || || || 6–4, 6–2
|-
| align=center|1938 || || || || || 6–0, 6–3
|-
| align=center|1939 || || || || || 6–0, 8–10, 6–4
|-
| align=center|1940 || || || || || 6–2, 6–3
|-
| align=center|1941 || || || || || 7–5, 6–2
|-
| align=center|1942 || || || || || 4–6, 6–1, 6–4
|-
| align=center|1943 || || || || || 6–3, 5–7, 6–3
|-
| align=center|1944 || || || || || 6–3, 8–6
|-
| align=center|1945 || || || || || 3–6, 8–6, 6–4
|-
| align=center|1946 || || || || || 11–9, 6–3
|-
| align=center|1947 || || || || || 8–6, 4–6, 6–1
|-
| align=center|1948 || || || || || 4–6, 6–4, 15–13
|-
| align=center|1949 || || || || || 6–3, 6–1
|-
| align=center|1950 || || || || || 6–4, 6–3
|-
| align=center|1951 || || || || || 6–3, 1–6, 6–4
|-
| align=center|1952 || || || || || 6–3, 7–5
|-
| align=center|1953 || || || || || 6–2, 6–4
|-
| align=center|1954 || || || || || 6–8, 6–1, 8–6
|-
| align=center|1955 || || || || || 6–4, 6–2
|-
| align=center|1956 || || || || || 6–3, 6–4
|-
| align=center|1957 || || || || || 6–3, 6–2
|-
| align=center|1958 || || || || || 3–6, 6–1, 6–2
|-
| align=center|1959 || || || || || 6–1, 6–4
|-
| align=center|1960 || || || || || 6–4, 10–12, 6–4
|-
| align=center|1961 || || || || || 6–3, 6–4
|-
| align=center|1962 || || || || || 9–7, 6–4
|-
| align=center|1963 || || || || || 7–5, 6–4
|-
| align=center|1964 || || || || || 6–1, 6–0
|-
| align=center|1965 || || || || || 8–6, 7–5
|-
| align=center|1966 || || || || || 6–3, 6–1
|-
| align=center|1967 || || || || || 11–9, 6–4
|}
US Open
thumb|upright|alt=A brown haired women in a black jacket and white shirt|[[Billie Jean King is a four-time champion overall and a three-time champion in the open era, and won three in four-year timespan]]
thumb|upright|alt=A blonde-haired female tennis player with multi-colored shorts and a black shirt, with the tennis racket out in front of her|American [[Chris Evert won an Open Era record four consecutive titles at the US Open between 1975 and 1978, and a record six overall (shared with Serena Williams) with victories in 1980 and 1982.]]
thumb|upright|alt=A blond-haired women wearing a white shirt|[[Steffi Graf is a five-time champion.]]
thumb|upright|alt=An African American woman in all white clothing, shirt, bandanna, and skirt, is starting the serve of a tennis ball|[[Serena Williams is a six-time champion, winning these over a fifteen-year period. She shares the Open Era titles record with Chris Evert.]]
{|class="sortable wikitable"
|-
!Year
!Country
!Champion
!Country
!Runner-up
!class="unsortable"|Score