# 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.
* Richey Reneberg (second round)
* Jim Grabb (first round)
* David Wheaton (champion)
* Scott Davis (first round)
* Dan Goldie (first round)
* Lawson Duncan (first round)
* Derrick Rostagno (quarterfinals)
* MaliVai Washington (semifinals)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking
| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 1 | R Reneberg | 6 | 7 | | | | | | | | | | | | | | | | | | | | |
| Q | T Mercer | 4 | 6 | | 1 | R Reneberg | 4 | 2 | | | | | | | | | | | | | | | |
| | A Mronz | 6 | 6 | | | A Mronz | 6 | 6 | | | | | | | | | | | | | | | |
| WC | R Van't Hof | 3 | 3 | | | | | | | | A Mronz | 6 | 6 | | | | | | | | | | |
| Q | A Aramburú | 0 | 2 | | | | | | | 7 | D Rostagno | 3 | 2 | | | | | | | | | | |
| | R Weiss | 6 | 6 | | | R Weiss | 5 | 3 | | | | | | | | | | | | | | | |
| | M Nido | 1 | 1 | | 7 | D Rostagno | 7 | 6 | | | | | | | | | | | | | | | |
| 7 | D Rostagno | 6 | 6 | | | | | | | | | | | | | A Mronz | 6 | 5 | 2 | | | | |
| 3 | D Wheaton | 3 | 6 | 7 | | | | | | | | | | | 3 | D Wheaton | 2 | 7 | 6 | | | | |
| | R Matuszewski | 6 | 1 | 5 | 3 | D Wheaton | 1 | 6 | 7 | | | | | | | | | | | | | | |
| | B Shelton | 0 | 3 | | Q | C Campbell | 6 | 3 | 5 | | | | | | | | | | | | | | |
| Q | C Campbell | 6 | 6 | | | | | | | 3 | D Wheaton | 6 | 6 | 7 | | | | | | | | | |
| | C Garner | 6 | 7 | | | | | | | | J Tarango | 2 | 7 | 6 | | | | | | | | | |
| Q | D Goldberg | 4 | 6 | | | C Garner | 4 | 5 | | | | | | | | | | | | | | | |
| | J Tarango | 6 | 6 | | | J Tarango | 6 | 7 | | | | | | | | | | | | | | | |
| 6 | L Duncan | 3 | 4 | | | | | | | | | | | | | | | | | 3 | David Wheaton | 6 | 6 |
| 5 | D Goldie | 3 | 6 | 3 | | | | | | | | | | | | | | | | | Mark Kaplan | 4 | 4 |
| | M Kaplan | 6 | 3 | 6 | | M Kaplan | 6 | 6 | | | | | | | | | | | | | | | |
| | J Brown | 1 | 2 | | | D Pate | 3 | 3 | | | | | | | | | | | | | | | |
| | D Pate | 6 | 6 | | | | | | | | M Kaplan | 6 | 6 | | | | | | | | | | |
| WC | J Ross | 3 | 3 | | | | | | | | T Wilkison | 4 | 2 | | | | | | | | | | |
| | J Rive | 6 | 6 | | | J Rive | 1 | 3 | | | | | | | | | | | | | | | |
| | T Wilkison | 6 | 6 | | | T Wilkison | 6 | 6 | | | | | | | | | | | | | | | |
| 4 | S Davis | 3 | 2 | | | | | | | | | | | | | M Kaplan | 6 | 6 | | | | | |
| WC/8 | M Washington | 6 | 6 | | | | | | | | | | | | WC/8 | M Washington | 2 | 3 | | | | | |
| | L Shiras | 2 | 1 | | WC/8 | M Washington | 2 | 6 | 6 | | | | | | | | | | | | | | |
| | L Lavalle | 6 | 6 | | | L Lavalle | 6 | 3 | 2 | | | | | | | | | | | | | | |
| | B Dyke | 3 | 1 | | | | | | | WC/8 | M Washington | 6 | 4 | 6 | | | | | | | | | |
| | M Wostenholme | 6 | 6 | | | | | | | | M Wostenholme | 4 | 6 | 3 | | | | | | | | | |
| | D Cassidy | 2 | 1 | | | M Wostenholme | 6 | 6 | | | | | | | | | | | | | | | |
| | B Pearce | 6 | 6 | | | B Pearce | 2 | 3 | | | | | | | | | | | | | | | |
| 2 | J Grabb | 1 | 4 | | | | | | | | | | | | | | | | | | | | |