2018 U.S. Men's Clay Court Championships

The 2018 U.S. Men's Clay Court Championships (also known as the Fayez Sarofim & Co. U.S. Men's Clay Court Championships for sponsorship purposes) was a tennis tournament played on outdoor clay courts. It was the 117th edition of the U.S. Men's Clay Court Championships, and an ATP World Tour 250 event on the 2018 ATP World Tour. It took place at River Oaks Country Club in Houston, Texas, United States, from April 9 through April 15, 2018.

Singles

 * 🇺🇸 Steve Johnson defeated 🇺🇸 Tennys Sandgren, 7–6(7–2), 2–6, 6–4

Doubles

 * 🇧🇾 Max Mirnyi / 🇦🇹 Philipp Oswald defeated 🇩🇪 Andre Begemann / Antonio Šančić, 6–7(2–7), 6–4, [11–9]

Seeds

 * Rankings are as of April 2, 2018.

Other entrants
The following players received wildcards into the main draw:
 * 🇩🇪 Dustin Brown
 * 🇦🇺 Nick Kyrgios
 * 🇺🇸 Mackenzie McDonald

The following players received entry via the qualifying draw:
 * 🇷🇸 Miomir Kecmanović
 * 🇺🇸 Stefan Kozlov
 * 🇺🇸 Denis Kudla
 * 🇯🇵 Yoshihito Nishioka

Withdrawals

 * Before the tournament
 * Kevin Anderson → replaced by Blaž Kavčič
 * 🇫🇷 Jérémy Chardy → replaced by 🇯🇵 Taro Daniel
 * 🇰🇷 Chung Hyeon → replaced by 🇺🇸 Bjorn Fratangelo
 * 🇸🇰 Lukáš Lacko → replaced by 🇺🇸 Tim Smyczek
 * 🇪🇸 Feliciano López → replaced by Henri Laaksonen
 * 🇦🇺 John Millman → replaced by 🇺🇸 Ernesto Escobedo

Seeds

 * Rankings are as of April 2, 2018.

Other entrants
The following pairs received wildcards into the doubles main draw:
 * 🇩🇪 Dustin Brown / 🇺🇸 Frances Tiafoe
 * Ivo Karlović / 🇨🇦 Daniel Nestor