Andy Murray defeated Juan Martín del Potro in the final, 6–7(4–7), 7–6(7–3), 6–1 to win the men's singles tennis title at the 2009 Canadian Open. Rafael Nadal was the defending champion, but lost in the quarterfinals to del Potro. This was first time since 1973 on the ATP Tour that all of the top eight ranked players advanced to the quarterfinals of a single tournament.

Seeds

The top eight seeds received a bye into the second round. All of them reached quarter-finals. • # Roger Federer (quarterfinals) • # 🇪🇸 Rafael Nadal (quarterfinals) • # 🇬🇧 Andy Murray (champion) • # 🇷🇸 Novak Djokovic (quarterfinals) • # 🇺🇸 Andy Roddick (semifinals) • # 🇦🇷 Juan Martín del Potro (final) • # 🇫🇷 Jo-Wilfried Tsonga (semifinals) • # 🇷🇺 Nikolay Davydenko (quarterfinals) • # 🇫🇷 Gilles Simon (third round) • # 🇪🇸 Fernando Verdasco (third round) • # Fernando González (third round) • # 🇸🇪 Robin Söderling (withdrew due to elbow injury) • # 🇫🇷 Gaël Monfils (second round) • # Marin Čilić (first round) • # 🇪🇸 Tommy Robredo (second round) • # 🇨🇿 Radek Štěpánek (first round) • # 🇨🇿 Tomáš Berdych (first round)

Main draw

Finals

Top half

Section 1

Section 2

Bottom half

Section 3

Section 4

Qualifying

Seeds

• # 🇪🇸 Juan Carlos Ferrero (qualified) • # 🇫🇷 Julien Benneteau (qualified) • # 🇰🇿 Andrey Golubev (qualifying competition, lucky loser) • # 🇷🇺 Teymuraz Gabashvili (qualifying competition) • # 🇨🇿 Jan Hernych (qualified) • # Ernests Gulbis (qualifying competition) • # 🇺🇸 Kevin Kim (first round) • # 🇫🇷 Josselin Ouanna (qualifying competition, retired due to wrist injury) • # 🇩🇪 Michael Berrer (first round) • # 🇺🇸 Rajeev Ram (first round) • # 🇫🇷 Michaël Llodra (qualifying competition) • # 🇨🇦 Jesse Levine (qualified) • # 🇺🇸 Brendan Evans (first round) • # 🇨🇴 Santiago Giraldo (first round)

Qualifiers

• # 🇪🇸 Juan Carlos Ferrero • # 🇫🇷 Julien Benneteau • # 🇨🇦 Jesse Levine • # 🇨🇦 Milos Raonic • # 🇨🇿 Jan Hernych • # 🇨🇴 Alejandro Falla • # 🇷🇺 Alex Bogomolov Jr.

Lucky losers

• # 🇰🇿 Andrey Golubev

Qualifying draw

First qualifier

Second qualifier

Third qualifier

Fourth qualifier

Fifth qualifier

Sixth qualifier

Seventh qualifier