The 1999 Canadian Open (known as the du Maurier Open for sponsorship reasons) was a tennis tournament played on outdoor hard courts. It was the 110th edition of the Canada Masters, and was part of the ATP Super 9 of the 1999 ATP Tour, and of the Tier I Series of the 1999 WTA Tour. The men's event took place at the du Maurier Stadium in Montreal, Quebec, Canada, from August 2 through August 8, 1999, and the women's event at the National Tennis Centre in Toronto, Ontario, Canada, from August 16 through August 23, 1999.
| Country | Player | Rank | Seed |
|---|---|---|---|
| 1 | 1 | ||
| 5 | 2 | ||
 France | Mary Pierce | 6 | 3 |
 Czech Republic | 7 | 4 | |
 Spain | 10 | 5 | |
| 9 | 6 | ||
| France | 12 | 7 | |
 Austria | 16 | 9 | |
| France | Sandrine Testud | 14 | 10 |
| Spain | Conchita Martínez | 18 | 12 |
| Patty Schnyder | 19 | 13 | |
 Romania | Irina Spîrlea | 20 | 14 |
 Russian Federation | Elena Likhovtseva | 21 | 15 |
| Chanda Rubin | 23 | 16 | |
| Amy Frazier | 24 | 17 | |
The following players received wildcards into the singles main draw:
The following players received wildcards into the doubles main draw:
The following players received entry from the qualifying draw:
See main article: 1999 du Maurier Open – Women's singles qualifying.
María Vento Émilie Loit
Elena Tatarkova
Nicole Pratt
Maureen Drake
Fabiola Zuluaga Tatiana PanovaSee main article: 1999 du Maurier Open – Women's doubles qualifying.
The following players received entry as lucky losers:
See main article: 1999 du Maurier Open – Men's singles. 
Thomas Johansson defeated Yevgeny Kafelnikov, 1–6, 6–3, 6–3
See main article: 1999 du Maurier Open – Women's singles. Martina Hingis defeated 
Monica Seles, 6–4, 6–4
See main article: 1999 du Maurier Open – Men's doubles. Jonas Björkman / Pat Rafter defeated Byron Black / Wayne Ferreira, 6–4, 6–3
See main article: 1999 du Maurier Open – Women's doubles. Jana Novotná / Mary Pierce defeated Larisa Neiland / Arantxa Sánchez Vicario, 6–3, 2–6, 6–3
