Roger Federer defeated the defending champion Andy Roddick in the final, 7–5, 6–3 to win the men's singles tennis title at the 2004 Canadian Open.

Seeds

Draw

Finals

Top half

Section 1

Section 2

Bottom half

Section 3

Section 4

Qualifying

Qualifying seeds

• # 🇫🇷 Michaël Llodra (qualified) • # 🇸🇰 Karol Beck (qualified) • # 🇫🇷 Cyril Saulnier (qualifying competition, lucky loser) • # 🇫🇷 Julien Benneteau (qualified) • # 🇰🇷 Lee Hyung-taik (qualified) • # Lu Yen-hsun (first round) • # 🇸🇪 Thomas Johansson (qualifying competition, lucky loser) • # 🇫🇷 Thierry Ascione (first round) • # 🇨🇿 Jan Hernych (qualified) • # 🇪🇨 Nicolás Lapentti (first round) • # 🇺🇸 Alex Bogomolov Jr. (qualified) • # 🇺🇸 Glenn Weiner (qualifying competition) • # 🇦🇺 Todd Reid (qualified) • # 🇮🇱 Harel Levy (qualifying competition) • # 🇺🇸 Jeff Salzenstein (first round) • # 🇫🇷 Julien Jeanpierre (qualifying competition)

Qualifiers

• # 🇫🇷 Michaël Llodra • # 🇸🇰 Karol Beck • # 🇺🇸 Alex Bogomolov Jr. • # 🇫🇷 Julien Benneteau • # 🇰🇷 Lee Hyung-taik • # Michel Kratochvil • # 🇨🇿 Jan Hernych • # 🇦🇺 Todd Reid

Lucky losers

• # 🇫🇷 Cyril Saulnier • # 🇸🇪 Thomas Johansson

Qualifying draw

First qualifier

Second qualifier

Third qualifier

Fourth qualifier

Fifth qualifier

Sixth qualifier

Seventh qualifier

Eighth qualifier