Seeds The following are the seeded players. Seedings are based on ATP rankings as of October 1, 2018. Rankings and points before are as of October 8, 2018. † The player did not qualify for the tournament in 2017. Accordingly, points for his 18th best result are deducted instead.
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 wildcards into the singles main draw: •
Li Zhe •
Stan Wawrinka •
Wu Yibing •
Zhang Ze The following players received entry from the qualifying draw: •
Taylor Fritz •
Hubert Hurkacz •
Bradley Klahn •
Mikhail Kukushkin •
Mackenzie McDonald •
Benoît Paire •
Vasek Pospisil Withdrawals ;Before the tournament •
Grigor Dimitrov → replaced by
Andreas Seppi •
Fabio Fognini → replaced by
Matthew Ebden •
David Goffin → replaced by
Jérémy Chardy •
John Isner → replaced by
Robin Haase •
Philipp Kohlschreiber → replaced by
Mischa Zverev •
Rafael Nadal → replaced by
Alex de Minaur •
Lucas Pouille → replaced by
Peter Gojowczyk •
Fernando Verdasco → replaced by
Maximilian Marterer Retirements •
Juan Martín del Potro ==Doubles main-draw entrants==