The 2005 U.S. Men's Clay Court Championships was an Association of Tennis Professionals men's tennis tournament held in Houston, Texas in the United States. The event was played on outdoor clay courts and was part of the International Series of the 2005 ATP Tour. It was the 37th edition of the tournament and was held from April 18 to April 25, 2005. First-seeded Andy Roddick won the singles tournament.
See main article: 2005 U.S. Men's Clay Court Championships – Singles. Andy Roddick defeated Sébastien Grosjean 6–2, 6–2
See main article: 2005 U.S. Men's Clay Court Championships – Doubles. Mark Knowles / Daniel Nestor defeated Martín García / Luis Horna 6–3, 6–4