1990 U.S. Men's Clay Court Championships – Singles
| Singles | |
|---|---|
| 1990 U.S. Men's Clay Court Championships | |
| Champion |
 David Wheaton
|
| Runner-up |
 Mark Kaplan
|
| Final score | 6–4, 6–3 |
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.
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.
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