2018 Western & Southern Open

The 2018 Western & Southern Open was a men's and women's tennis tournament played on outdoor hard courts from August 13–19, 2018. It took place at the Lindner Family Tennis Center in Mason, Ohio, a northern suburb of Cincinnati, in the United States. It was a Masters 1000 tournament on the 2018 ATP World Tour and a WTA Premier 5 tournament on the 2018 WTA Tour. The tournament was one of two headline events in the 2018 US Open Series. The 2018 tournament was the 117th men's edition and the 90th women's edition of the Cincinnati Masters.

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

Seeds

 * Rankings are as of August 6, 2018

Other entrants
The following pairs received wildcards into the doubles main draw:
 * 🇺🇸 Ryan Harrison / 🇺🇸 Nicholas Monroe
 * 🇺🇸 Mackenzie McDonald / 🇨🇦 Daniel Nestor

The following pair received entry as alternates:
 * 🇦🇷 Leonardo Mayer / 🇪🇸 Albert Ramos Viñolas

Withdrawals

 * Before the tournament
 * 🇦🇹 Dominic Thiem


 * During the tournament
 * 🇦🇹 Alexander Peya

Seeds

 * 1 Rankings are as of August 6, 2018

Other entrants
The following players received wild cards into the main singles draw:
 * 🇺🇸 Amanda Anisimova
 * 🇧🇾 Victoria Azarenka
 * 🇷🇺 Svetlana Kuznetsova
 * 🇺🇸 Bethanie Mattek-Sands
 * 🇨🇿 Markéta Vondroušová

The following player received entry using a protected ranking:
 * 🇺🇸 Serena Williams

The following players received entry from the singles qualifying draw:
 * 🇷🇴 Ana Bogdan
 * 🇫🇷 Alizé Cornet
 * 🇪🇪 Kaia Kanepi
 * 🇺🇸 Allie Kiick
 * 🇸🇰 Viktória Kužmová
 * 🇺🇸 Varvara Lepchenko
 * 🇩🇪 Tatjana Maria
 * Petra Martić
 * 🇸🇪 Rebecca Peterson
 * 🇧🇾 Aliaksandra Sasnovich
 * 🇦🇺 Ajla Tomljanović
 * Stefanie Vögele

The following player received entry as a lucky loser:
 * 🇮🇹 Camila Giorgi

Withdrawals

 * Before the tournament
 * 🇷🇴 Mihaela Buzărnescu → replaced by 🇺🇸 Danielle Collins
 * 🇸🇰 Dominika Cibulková → replaced by 🇭🇺 Tímea Babos
 * 🇷🇺 Maria Sharapova → replaced by 🇨🇿 Kateřina Siniaková
 * 🇺🇸 Venus Williams → replaced by 🇮🇹 Camila Giorgi
 * 🇨🇳 Zhang Shuai → replaced by 🇷🇸 Aleksandra Krunić

Retirements

 * Caroline Wozniacki

Seeds

 * Rankings are as of August 6, 2018

Other entrants
The following pairs received wildcards into the doubles main draw:
 * 🇺🇸 Jennifer Brady / 🇺🇸 Caroline Dolehide
 * 🇺🇸 Lauren Davis / 🇺🇸 Nicole Gibbs

The following pair received entry as alternates:
 * 🇺🇸 Kaitlyn Christian / 🇺🇸 Sabrina Santamaria

Withdrawals

 * Before the tournament
 * 🇦🇺 Ashleigh Barty

Retirements

 * 🇺🇸 Bethanie Mattek-Sands

Men's singles

 * 🇷🇸 Novak Djokovic def. Roger Federer, 6–4, 6–4

Women's singles

 * Kiki Bertens def. 🇷🇴 Simona Halep, 2–6, 7–6(8–6), 6–2

Men's doubles

 * 🇬🇧 Jamie Murray / 🇧🇷 Bruno Soares def. 🇨🇴 Juan Sebastián Cabal / 🇨🇴 Robert Farah, 4–6, 6–3, [10–6]

Women's doubles

 * 🇨🇿 Lucie Hradecká / 🇷🇺 Ekaterina Makarova def. 🇧🇪 Elise Mertens / Demi Schuurs, 6–2, 7–5