1 | 1 | 
WithdrawalsThe following players would have been seeded, but they withdrew from the event.
| Rank | Player | Points before | 2017 Western & [Southern Open – Men's singles|Points defending] | Points after | Reason | | 14 | 
Other entrantsThe following players received wild cards into the main singles draw:
The following players received entry from the singles qualifying draw:
The following players received entry as lucky losers:
Withdrawals;Before the tournament
RetirementsATP doubles main-draw entrantsSeeds- Rankings are as of August 6, 2018
Other entrantsThe following pairs received wildcards into the doubles main draw:
The following pair received entry as alternates:
Withdrawals;Before the tournament
;During the tournament
WTA singles main-draw entrantsSeeds| Country | Player | Rank1 | Seed |  Romania
Other entrantsThe following players received wild cards into the main singles draw:
The following player received entry using a protected ranking:
The following players received entry from the singles qualifying draw:
The following player received entry as a lucky loser:
Withdrawals;Before the tournament
RetirementsWTA doubles main-draw entrantsSeeds- Rankings are as of August 6, 2018
Other entrantsThe following pairs received wildcards into the doubles main draw:
The following pair received entry as alternates:
Withdrawals;Before the tournament
RetirementsChampionsMen's singlesNovak Djokovic def. Roger Federer, 6–4, 6–4
Women's singlesKiki Bertens def. Simona Halep, 2–6, 7–6, 6–2
Men's doublesJamie Murray / Bruno Soares def. Juan Sebastián Cabal / Robert Farah, 4–6, 6–3,
Women's doublesLucie Hradecká / Ekaterina Makarova def. Elise Mertens / Demi Schuurs, 6–2, 7–5
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