The Ameritech Cup (known also as the Virginia Slims of Chicago and the Avon Championships of Chicago) is a defunct WTA Tour affiliated tennis tournament held every year from 1971 until 1997 in Chicago, Illinois in the United States. Its sponsors were Virginia Slims from 1971 to 1978 and again from 1983 to 1994, Avon from 1979 to 1982 and Ameritech from 1995 to 1997. The tournament was classified as Tier III in 1988-1989, Tier I in 1990 and Tier II until 1997, and was played on indoor carpet courts.

Martina Navratilova was the most successful player at the tournament, winning the singles competition 12 times and the doubles competition 7 times. Past champions also include former No. 1 players Chris Evert (1977), Monica Seles (1993) and Lindsay Davenport (1997).

Past finals

Singles

Year	Champion	Runner-up	Score[1]
1971	Françoise Dürr	Billie Jean King	6–4, 6–2
1972	Not held
1973	Margaret Court	Billie Jean King	6–2, 4–6, 6–4
1974	Virginia Wade	Rosemary Casals	2–6, 6–4, 6–4
1975	Margaret Court	Martina Navratilova	6–3, 3–6, 6–2
1976	Evonne Goolagong Cawley	Virginia Wade	3–6, 6–3, 6–2
1977	Chris Evert	Margaret Court	6–1, 6–3
1978	Martina Navratilova	Evonne Goolagong Cawley	6–7(4–5), 6–2, 6–2
1979	Martina Navratilova	Tracy Austin	6–3, 6–4
1980	Martina Navratilova	Chris Evert-Lloyd	6–4, 6–4
1981	Martina Navratilova	Hana Mandlíková	6–4, 6–2
1982	Martina Navratilova	Wendy Turnbull	6–4, 6–1
1983	Martina Navratilova	Andrea Jaeger	6–3, 6–2
1984	Pam Shriver	Barbara Potter	7–6, 2–6, 6–3
1985	Bonnie Gadusek	Kathy Rinaldi	6–1, 6–3
1986	Martina Navratilova	Hana Mandlíková	7–5, 7–5
1987	Martina Navratilova	Natasha Zvereva	6–1, 6–2
1988	Martina Navratilova	Chris Evert	6–2, 6–2
1989	Zina Garrison	Larisa Savchenko	6–3, 2–6, 6–4
1990	Martina Navratilova	Manuela Maleeva-Fragnière	6–3, 6–2
1991	Martina Navratilova	Zina Garrison-Jackson	6–1, 6–2
1992	Martina Navratilova	Jana Novotná	7–6, 4–6, 7–5
1993	Monica Seles	Martina Navratilova	3–6, 6–2, 6–1
1994	Natasha Zvereva	Chanda Rubin	6–3, 7–5
1995	Magdalena Maleeva	Lisa Raymond	7–5, 7–6
1996	Jana Novotná	Jennifer Capriati	6–4, 3–6, 6–1
1997	Lindsay Davenport	Nathalie Tauziat	6–0, 7–5

Doubles

Year	Champions	Runners-up	Score[2]
1971	Judy Dalton Françoise Dürr	Rosemary Casals Billie Jean King	6–4, 7–6
1972	Not held
1973	Rosemary Casals Billie Jean King	Karen Krantzcke Betty Stöve	6–4, 6–2
1974	Chris Evert Billie Jean King	Françoise Dürr Betty Stöve	3–6, 6–4, 6–4
1975	Chris Evert Martina Navratilova	Margaret Court Olga Morozova	6–2, 7–6
1976	Olga Morozova Virginia Wade	Evonne Goolagong Cawley Martina Navratilova	6–7(4–5), 6–4, 6–4
1977	Rosemary Casals Chris Evert	Margaret Court Betty Stöve	6–3, 6–4
1978	Betty Stöve Evonne Goolagong Cawley	Rosemary Casals JoAnne Russell	6–1, 6–4
1979	Rosemary Casals Betty Ann Grubb Stuart	Ilana Kloss Greer Stevens	3–6, 7–5, 7–5
1980	Billie Jean King Martina Navratilova	Sylvia Hanika Kathy Jordan	6–3, 6–4
1981	Martina Navratilova Pam Shriver	Barbara Potter Sharon Walsh	6–3, 6–1
1982	Martina Navratilova Pam Shriver	Rosemary Casals Wendy Turnbull	7–5, 6–4
1983	Martina Navratilova Pam Shriver	Kathy Jordan Anne Smith	6–1, 6–2
1984	Billie Jean King Sharon Walsh	Barbara Potter Pam Shriver	5–7, 6–3, 6–3
1985	Kathy Jordan Elizabeth Smylie	Elise Burgin JoAnne Russell	6–2, 6–2
1986	Claudia Kohde-Kilsch Helena Suková	Steffi Graf Gabriela Sabatini	6–7, 7–6, 6–3
1987	Claudia Kohde-Kilsch Helena Suková	Zina Garrison Lori McNeil	6–4, 6–3
1988	Lori McNeil Betsy Nagelsen	Larisa Savchenko Natasha Zvereva	6–4, 3–6, 6–4
1989	Larisa Savchenko Natasha Zvereva	Jana Novotná Helena Suková	6–3, 2–6, 6–3
1990	Martina Navratilova Anne Smith	Arantxa Sánchez Vicario Nathalie Tauziat	6–7, 6–4, 6–3
1991	Gigi Fernández Jana Novotná	Martina Navratilova Pam Shriver	6–2, 6–4
1992	Martina Navratilova Pam Shriver	Katrina Adams Zina Garrison-Jackson	6–4, 7–6
1993	Katrina Adams Zina Garrison-Jackson	Amy Frazier Kimberly Po	7–6(9–7), 6–3
1994	Gigi Fernández Natasha Zvereva	Manon Bollegraf Martina Navratilova	6–3, 3–6, 6–4
1995	Gabriela Sabatini Brenda Schultz	Marianne Werdel Tami Whitlinger-Jones	5–7, 7–6, 6–4
1996	Lisa Raymond Rennae Stubbs	Angela Lettiere Nana Miyagi	6–1, 6–1
1997	Alexandra Fusai Nathalie Tauziat	Lindsay Davenport Monica Seles	6–3, 6–2