The 1990 Canadian Open was a tennis tournament played on outdoor hard courts. It was the 101st edition of the Canada Masters and was part of the Championship Series, Single-Week of the 1990 ATP Tour and of Tier I of the 1990 WTA Tour. The men's event took place at the National Tennis Centre in Toronto in Canada from July 23 through July 30, 1990, and the women's event at the du Maurier Stadium in Montreal in Canada from July 30 through August 6, 1990.
See main article: 1990 Canadian Open – Men's singles. Michael Chang defeated Jay Berger 4–6, 6–3, 7–6(7–3)
See main article: 1990 Canadian Open – Women's singles. Steffi Graf defeated Katerina Maleeva 6–1, 6–7, 6–3
See main article: 1990 Canadian Open – Men's doubles. Paul Annacone / David Wheaton defeated Broderick Dyke / Peter Lundgren 6–1, 7–6
See main article: 1990 Canadian Open – Women's doubles. Betsy Nagelsen / Gabriela Sabatini defeated Helen Kelesi / Raffaella Reggi 3–6, 6–2, 6–2