Nicolás Almagro was the two-time defending champion, but lost in the quarterfinals to David Nalbandian.
Rafael Nadal won the title, defeating Nalbandian in the final 6–2, 6–3.
Juan Mónaco was the defending champion but withdrew before the event started.
David Ferrer was the defending champion, but lost to Mikhail Youzhny in the final, 3–6, 5–7.
Tommy Robredo was the defending champion, but he decided to compete in Houston instead.
Stanislas Wawrinka was the defending champion, but withdrew before the event started.
Carlos Berlocq won the title, defeating Tomáš Berdych in the final, 0–6, 7–5, 6–1.
Nicolas Mahut was the defending champion, but lost in the quarterfinals to Roberto Bautista Agut.
Bautista Agut went on to win the title, defeating Benjamin Becker in the final, 2–6, 7–6(7–2), 6–4.
João Sousa was the defending champion, but lost to Benjamin Becker in the first round.
Kei Nishikori won the title, defeating Julien Benneteau in the final, 7–6(7–4), 6–4.
Austin Krajicek won his maiden ATP Challenger Tour singles title, beating João Souza 7–5, 6–3
Grigor Dimitrov was the defending champion, but lost to Tomáš Berdych in the final, 5–7, 6–4, 6–4.
This was the first edition of the tournament since 1991.
Thomaz Bellucci won the title, defeating João Sousa in the final, 7–6(7–4), 6–4.
This was the first edition of the tournament since 2008.
Pablo Andújar was the defending champion, but lost to Thomaz Bellucci in the quarterfinals.
Víctor Estrella Burgos was the defending champion and successfully defended his title, defeating Thomaz Bellucci in the final, 4–6, 7–6(7–5), 6–2.
Richard Gasquet was the defending champion and successfully defended his title, defeating Paul-Henri Mathieu in the final, 7–5, 6–4.
Richard Gasquet was the defending champion, but chose not to participate this year.
Milos Raonic was the defending champion, but lost in the second round to Mikhail Youzhny.
Dominic Thiem was the defending champion, but chose to compete in Rotterdam instead.
Nicolás Almagro was the defending champion, but lost in the quarterfinals to Pablo Carreño Busta.
Feliciano López was the defending champion, but lost in the second round to Yannick Hanfmann.
Tomáš Berdych was the two-time defending champion, but withdrew before the competition began.
