Ernests Gulbis was the defending champion, but lost to Jérémy Chardy in the second round.
Gilles Simon won the title, defeating Gaël Monfils in the final, 6–4, 1–6, 7–6(7–4).
The top four seeds receive a bye into the second round.
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Milos Raonic (second round).svg/1280px-Flag_of_Switzerland_(Pantone).svg.png){kind=small}
Stan Wawrinka (quarterfinals)
Ernests Gulbis (second round)
Roberto Bautista Agut (semifinals)
Gilles Simon (champion).svg/1280px-Flag_of_Belgium_(civil).svg.png){kind=small}
David Goffin (second round, retired) Gaël Monfils (final)
Lukáš Rosol (first round)
Jürgen Melzer (first round)
Marsel İlhan (qualifying competition) Kenny de Schepper (qualifying competition) Nicolas Mahut (qualified) Pierre-Hugues Herbert (qualified)
Norbert Gombos (second round)
Alexander Zverev (qualified)
Marius Copil (first round)