The 1998 du Maurier Open was a tennis tournament played on outdoor hard courts. It was the 109th edition of the Canada Masters and was part of the Super 9 of the 1998 ATP Tour and of Tier I of the 1998 WTA Tour. The men's event took place at the National Tennis Centre in Toronto in Canada from August 3 through August 10, 1998, while the women's event took place at the du Maurier Stadium in Montreal in Canada from August 17 through August 23, 1998.
See main article: 1998 du Maurier Open – Men's singles. Patrick Rafter defeated Richard Krajicek 7–6(7–3), 6–4
See main article: 1998 du Maurier Open – Women's singles. Monica Seles defeated Arantxa Sánchez-Vicario 6–3, 6–2
See main article: 1998 du Maurier Open – Men's doubles. Martin Damm / Jim Grabb defeated Ellis Ferreira / Rick Leach 6–7, 6–2, 7–6
See main article: 1998 du Maurier Open – Women's doubles. Martina Hingis / Jana Novotná defeated Yayuk Basuki / Caroline Vis 6–3, 6–4