1990 U.S. Men's Clay Court Championships – Singles

Jay Berger was the defending champion, but did not participate this year.

David Wheaton won the title, defeating Mark Kaplan 6–4, 6–3 in the final.

Seeds
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.


 * 1) 🇺🇸 Richey Reneberg (second round)
 * 2) 🇺🇸 Jim Grabb (first round)
 * 3) 🇺🇸 David Wheaton (champion)
 * 4) 🇺🇸 Scott Davis (first round)
 * 5) 🇺🇸 Dan Goldie (first round)
 * 6) 🇺🇸 Lawson Duncan (first round)
 * 7) 🇺🇸 Derrick Rostagno (quarterfinals)
 * 8) 🇺🇸 MaliVai Washington (semifinals)