Ivo Karlović was the defending champion from when the tournament was last held in 2008, but chose not to participate.
Denis Istomin won the title, defeating Sam Querrey in the final, 7–6(7–1), 7–6(8–6).
All seeds receive a bye into the second round.
David Ferrer (second round)
Gilles Simon (quarterfinals) Feliciano López (third round)
Leonardo Mayer (quarterfinals)
Pablo Cuevas (third round)
Viktor Troicki (second round)
Dominic Thiem (third round) Adrian Mannarino (third round) Juan Mónaco (second round)
Martin Kližan (second round) Pablo Andújar (second round)
Sam Querrey (final)
Thomaz Bellucci (second round)
João Sousa (third round)
Andreas Seppi (second round)
Jiří Veselý (third round)