Seeds • Rankings are as of May 9, 2016.
Other entrants The following players received wildcards into the singles main draw: •
Marin Čilić •
David Ferrer •
Janko Tipsarević The following players received entry from the qualifying draw: •
Andreas Beck •
Evgeny Donskoy •
Christian Garín •
Roberto Ortega Olmedo The following player received entry as a lucky loser: •
Florian Mayer Withdrawals ;Before the tournament •
Marcos Baghdatis →replaced by
Mikhail Youzhny •
Philipp Kohlschreiber →replaced by
Ernests Gulbis •
John Millman →replaced by
Ričardas Berankis Retirements •
Denis Istomin == Doubles main draw entrants ==