It was the 116th edition of the Canada Masters, and was part of the ATP Masters Series of the 2005 ATP Tour, and of the Tier I Series of the 2005 WTA Tour.

2 and French Open champion Rafael Nadal, Australian Open and Indian Wells finalist Lleyton Hewitt, and Wimbledon runner-up and Washington winner Andy Roddick.

1 and recent Los Angeles champion Andre Agassi, Pörtschach titlist Nikolay Davydenko, Gastón Gaudio, Guillermo Coria and Mariano Puerta.

2 and Rome winner Amélie Mauresmo, Warsaw runner-up Svetlana Kuznetsova, and Roland-Garros champion Justine Henin-Hardenne.

Other top seeds were Australian Open champion Serena Williams, Berlin finalist Nadia Petrova, Kim Clijsters, Anastasia Myskina and Nathalie Dechy.