Four-time defending champion Rafael Nadal successfully defended his title, defeating David Ferrer in a rematch of the previous year's final, 6–2, 7–5, to win the singles title at the 2009 Barcelona Open. It was his record-extending fifth title at the Barcelona Open.

Seeds

The top eight seeds receive a bye into the second round. • # 🇪🇸 Rafael Nadal (champion) • # 🇪🇸 Fernando Verdasco (quarterfinals) • # 🇷🇺 Nikolay Davydenko (semifinals) • # 🇪🇸 David Ferrer (final) • # Fernando González (semifinals) • # 🇪🇸 Tommy Robredo (quarterfinals) • # 🇦🇷 David Nalbandian (quarterfinals, withdrew due to hip injury) • # Stanislas Wawrinka (third round) • # 🇨🇿 Radek Štěpánek (quarterfinals) • # 🇪🇸 Nicolás Almagro (third round) • # 🇷🇺 Marat Safin (first round) • # 🇷🇺 Igor Andreev (third round) • # 🇫🇷 Richard Gasquet (second round) • # 🇸🇪 Robin Söderling (second round) • # 🇨🇿 Tomáš Berdych (third round) • # 🇪🇸 Feliciano López (third round)

Draw

Finals

Top half

Section 1

Section 2

Bottom half

Section 3

Section 4

Qualifying

Seeds

• # Fred Gil (qualified) • # 🇩🇪 Mischa Zverev (qualifying competition) • # 🇪🇸 Daniel Gimeno Traver (qualified) • # Nicolás Massú (first round) • # Paul Capdeville (first round) • # 🇪🇸 Pablo Andújar (qualifying competition) • # 🇧🇪 Kristof Vliegen (qualifying competition) • # 🇪🇸 Iván Navarro (first round) • # 🇪🇨 Nicolás Lapentti (qualified) • # 🇰🇿 Andrey Golubev (first round) • # 🇮🇹 Fabio Fognini (qualified) • # 🇪🇸 Rubén Ramírez Hidalgo (first round) • # 🇮🇹 Flavio Cipolla (qualifying competition) • # 🇪🇸 Santiago Ventura Bertomeu (qualified)

Qualifiers

• # Fred Gil • # 🇪🇸 Santiago Ventura Bertomeu • # 🇪🇸 Daniel Gimeno Traver • # 🇪🇸 Pere Riba • # 🇪🇨 Nicolás Lapentti • # 🇰🇿 Mikhail Kukushkin • # 🇮🇹 Fabio Fognini

Draw

First qualifier

Second qualifier

Third qualifier

Fourth qualifier

Fifth qualifier

Sixth qualifier

Seventh qualifier