Seeds The following are the seeded players. Seedings are based on ATP rankings as of August 6, 2018. Rankings and points before are as of August 13, 2018.
Withdrawals The following players would have been seeded, but they withdrew from the event. † Fognini is entitled to use an exemption to skip the tournament and substitute his 18th best result (90 points) in its stead. Accordingly, his points after the tournament will remain unchanged.
Other entrants The following players received
wild cards into the main singles draw: •
Mackenzie McDonald •
Andy Murray •
Frances Tiafoe •
Stan Wawrinka The following players received entry from the singles
qualifying draw: •
Marius Copil •
Hubert Hurkacz •
Bradley Klahn •
Denis Kudla •
Dušan Lajović •
Daniil Medvedev •
Michael Mmoh The following players received entry as lucky losers: •
Guillermo García López •
Malek Jaziri Withdrawals ;Before the tournament •
Roberto Bautista Agut → replaced by
Benoît Paire •
Tomáš Berdych → replaced by
João Sousa •
Fabio Fognini → replaced by
Jérémy Chardy •
Gaël Monfils → replaced by
Márton Fucsovics •
Rafael Nadal → replaced by
Malek Jaziri •
Dominic Thiem → replaced by
Guillermo García López Retirements •
David Goffin ==ATP doubles main-draw entrants==