| Singles | |
|---|---|
| 1990 U.S. Men's Clay Court Championships | |
| Champion |  David Wheaton |
| Runner-up |  Mark Kaplan |
| Score | 6–4, 6–3 |
| Draw | 32 |
| Seeds | 8 |
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.
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)| First round | Second round | Quarterfinals | Semifinals | 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 | |||||||||||||||||||||||||||||||
David Wheaton was the defending champion, but lost in the quarterfinals this year.
Jaime Yzaga was the defending champion, but lost in the first round this year.
Jason Stoltenberg was the defending champion, but lost in the second round this year.
Goran Ivanišević defeated Andriy Medvedev in the final, 6–4, 6–2, 7–6(7–2) to win the singles tennis title at the 1993 Paris Open.
Defending champion Andre Agassi defeated Pete Sampras in the final, 3–6, 6–2, 6–3 to win the men's singles tennis title at the 1995 Canadian Open.
Michael Chang defeated Jay Berger in the final, 4–6, 6–3, 7–6(7–3) to win the men's singles tennis title at the 1990 Canadian Open. With the win, Chang became the youngest Masters champion in history.
Kelly Evernden and Todd Witsken were the defending champions but they competed with different partners that year, Evernden with Nicolás Pereira and Witsken with Jorge Lozano.
Andre Agassi was the defending champion but lost in the third round to David Wheaton.
Brad Gilbert was the defending champion but lost in the second round to Cristiano Caratti.
Mark Kratzmann and Wally Masur were the defending champions but only Masur competed that year with Pat Cash.
Todd Woodbridge and Mark Woodforde were the defending champions but only Woodbridge competed that year with Jonas Björkman.
Carlos Moyá was the defending champion and won in the final 6–2, 6–3 against David Ferrer.
José Acasuso was the defending champion but did not compete that year.
David Ferrer was the defending champion but lost in the first round to Galo Blanco.
Roger Federer was the defending champion and won in the final 4–6, 6–1, 6–2 against Feliciano López.
Sergio Casal and Emilio Sánchez were the defending champions but did not compete that year.
Todd Woodbridge and Mark Woodforde were the defending champions but did not compete that year.
Cédric Pioline was the defending champion but did not compete that year.
Second-seeded pair Steve DeVries and David Macpherson won in the final against Bret Garnett and Jared Palmer. It was the pair's second victory in two weeks following their win at the AT&T Challenge in Atlanta.