Tennis tournament
The USTA Girls 18s National Championships is a prestigious junior tennis tournament held on outdoor hard courts in San Diego. It is the highest level domestic junior tournament hosted by the USTA. The tournament is contested in early August just before the US Open (tennis). The winners of the singles and doubles events are awarded with a wild card into the US Open.
| Year | Champion | Runner-up | Score |
| 1918 |  Katherine Porter | | |
| 1919 | Katherine Gardner | | |
| 1920 | Louise Dixon | | |
| 1921 | Helen Wills | | |
| 1922 | Helen Wills | | |
| 1923 | Helen Hooker | | |
| 1924 | Helen Jacobs | | |
| 1925 | Helen Jacobs | | |
| 1926 | Louise McFarland | | |
| 1927 | Marjorie Gladman | | |
| 1928 | Sarah Palfrey | | |
| 1929 | Sarah Palfrey | | |
| 1930 | Sarah Palfrey | | |
| 1931 | Ruby Bishop | | |
| 1932 | Helen Fulton | | |
| 1933 | Bonnie Miller | | |
| 1934 | Helen Pedersen | | |
| 1935 | Patricia Henry | | |
| 1936 | Margaret Osborne | | |
| 1937 | Barbara Winslow | | |
| 1938 | Helen Bernhard | | |
| 1939 | Helen Bernhard | | |
| 1940 | Louise Brough | | |
| 1941 | Louise Brough | | |
| 1942 | Doris Hart | | |
| 1943 | Doris Hart | | |
| 1944 | Shirley Fry | | |
| 1945 | Shirley Fry | | |
| 1946 | Helen Pastall | | |
| 1947 | Nancy Chaffee | | |
| 1948 | Beverly Baker | | |
| 1949 | Maureen Connolly | | |
| 1950 | Maureen Connolly | | |
| 1951 | Arita Kanter | | |
| 1952 | Julia Sampson | | |
| 1953 | Mary Ann Ellenberger | | |
| 1954 | Barbara Breit | | |
| 1955 | Barbara Breit | | |
| 1956 | Miriam Arnold | | |
| 1957 | Karen Hantze | | |
| 1958 | Sally Moore | | |
| 1959 | Karen Hantze | | |
| 1960 | Karen Hantze | | |
| 1961 | Victoria Palmer | | |
| 1962 | Victoria Palmer | | |
| 1963 | Julie Heldman | | |
| 1964 | Mary Ann Eisel | | |
| 1965 | Jane Bartkowicz | | |
| 1966 | Jane Bartkowicz | | |
| 1967 | Jane Bartkowicz | | |
| 1968 | Kristy Pigeon | | |
| 1969 | Sharon Walsh | | |
| 1970 | Sharon Walsh | | |
| 1971 | Chris Evert | | |
| 1972 | Ann Kiyomura | | |
| 1973 | Carrie Fleming | | |
| 1974 | Rayni Fox | | |
| 1975 | Beth Norton | | |
| 1976 | Lynn Epstein | | |
| 1977 | Tracy Austin | | |
| 1978 | Tracy Austin | | |
| 1979 | Andrea Jaeger | | |
| 1980 | Kate Gompert | | |
| 1981 | Lisa Bonder | | |
| 1982 | Leigh-Anne Eldredge | | |
| 1983 | Caroline Kuhlman | | |
| 1984 | Melissa Gurney | | |
| 1985 | Stephanie Rehe | | |
| 1986 | Tami Whitlinger | | |
| 1987 | Ann Grossman | | |
| 1988 | Laxmi Poruri | | |
| 1989 | Jennifer Capriati | | |
| 1990 | Lisa Raymond | | |
| 1991 | Lindsay Davenport | | |
| 1992 | Maria Vento | | |
| 1993 | Janet Lee | | |
| 1994 | Meilen Tu | | |
| 1995 | Aubrie Rippner | | |
| 1996 | Lilia Osterloh | | |
| 1997 | Jacqueline Trail | | |
| 1998 | Laura Granville | | |
| 1999 | Laura Granville | | |
| 2000 | Kristen Schlukebir | | |
| 2001 | Amber Liu | | |
| 2002 | Alexandra Podkolzina | | |
| 2003 | Theresa Logar | | |
| 2004 | Jessica Kirkland | Andrea Remynse | 6-1, 6-3 |
| 2005 | Mary Gambale | Alexa Glatch | 7-6, 5-7, 6-1 |
| 2006 | Lauren Albanese | Ashley Weinhold | 6-3, 6-0 |
| 2007 | Ashley Weinhold | Alison Riske | 6-3, 6-3 |
| 2008 | Gail Brodsky | Coco Vandeweghe | 7-5, 6-1 |
| 2009 | Christina McHale | Lauren Embree | 6-0, 6-1 |
| 2010 | Shelby Rogers | Nicole Gibbs | 6-3, 5-7, 7-6 |
| 2011 | Lauren Davis | Nicole Gibbs | 7-6, 1-6, 6-3 |
| 2012 | Victoria Duval | Allie Kiick | 3-6, 6-1, 6-0 |
| 2013 | Sachia Vickery | Allie Kiick | 4-6, 6-2, 6-0 |
| 2014 | CiCi Bellis | Tornado Alicia Black | 6-3, 6-1 |
| 2015 | Sofia Kenin | Tornado Alicia Black | 6-2, 5-7, 7-5 |
| 2016 | Kayla Day | Nicole Frenkel | 6-2, 3-6, 6-1 |
| 2017 | Ashley Kratzer | Kelly Chen | 6-2, 4-6, 6-4 |
| 2018 | Whitney Osuigwe | Kayla Day | 7-5, 6-3 |
| 2019 | Katie Volynets | Emma Navarro | 6-2, 6-4 |
| 2021 | Ashlyn Krueger | Reese Brantmeier | 6-2, 7-6(3) |
Ashlyn Krueger