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.[1][2] 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 Open.
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.
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.
The 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:
The following pairs received wildcards into the doubles main draw:
The following pair received entry as alternates:
The following player received entry using a protected ranking:
The following player received entry as a lucky loser: