# 2004 U.S. Men's Clay Court Championships – Singles

Andre Agassi was the defending champion but did not compete that year.
Tommy Haas won in the final 6–3, 6–4 against Andy Roddick.

## Seeds

A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.
* Andy Roddick (final)
* Mardy Fish (first round)
* Taylor Dent (first round)
* James Blake (quarterfinals)
* Andrei Pavel (semifinals)
* Robby Ginepri (first round)
* Luis Horna (semifinals)
* Jürgen Melzer (quarterfinals)

## 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 | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 1 | A Roddick | 6 | 7 | | | | | | | | | | | | | | | | | | | |
| | K Carlsen | 1 | 5 | | 1 | A Roddick | 6 | 6 | | | | | | | | | | | | | | |
| | R Kendrick | 6 | 3 | 7$^7$ | | R Kendrick | 2 | 3 | | | | | | | | | | | | | | |
| LL | S de Chaunac | 2 | 6 | 6$^2$ | | | | | | 1 | A Roddick | 7 | 7$^7$ | | | | | | | | | |
| | A Popp | 1 | 3 | | | | | | | 8 | J Melzer | 5 | 6$^5$ | | | | | | | | | |
| | T Behrend | 6 | 6 | | | T Behrend | 2 | 4 | | | | | | | | | | | | | | |
| Q | D Veronelli | 3 | 1 | | 8 | J Melzer | 6 | 6 | | | | | | | | | | | | | | |
| 8 | J Melzer | 6 | 6 | | | | | | | | | | | 1 | A Roddick | 6 | 6 | | | | | |
| 3 | T Dent | 6 | 5 | 6$^5$ | | | | | | | | | | 7 | L Horna | 3 | 4 | | | | | |
| | F Squillari | 0 | 7 | 7$^7$ | | F Squillari | 6$^3$ | 6$^6$ | | | | | | | | | | | | | | |
| | M Vassallo Argüello | 1 | 2 | | WC | T Martin | 7$^7$ | 7$^8$ | | | | | | | | | | | | | | |
| WC | T Martin | 6 | 6 | | | | | | | WC | T Martin | 5 | 3 | | | | | | | | | |
| Q | J-C Faurel | 0 | 2 | | | | | | | 7 | L Horna | 7 | 6 | | | | | | | | | |
| Q | S Robert | 6 | 6 | | Q | S Robert | 6 | 1 | 3 | | | | | | | | | | | | | |
| WC | B Vahaly | 3 | 1 | | 7 | L Horna | 0 | 6 | 6 | | | | | | | | | | | | | |
| 7 | L Horna | 6 | 6 | | | | | | | | | | | | | | | | 1 | Andy Roddick | 3 | 4 |
| 5 | A Pavel | 6 | 6 | | | | | | | | | | | | | | | | | Tommy Haas | 6 | 6 |
| | N Lapentti | 4 | 3 | | 5 | A Pavel | 4 | 6 | 6 | | | | | | | | | | | | | |
| | L Burgsmüller | 2 | 2 | | | J Acasuso | 6 | 3 | 2 | | | | | | | | | | | | | |
| | J Acasuso | 6 | 6 | | | | | | | 5 | A Pavel | 6 | 6 | | | | | | | | | |
| Q | A Peya | 3 | 7 | 4 | | | | | | 3 | J Blake | 4 | 4 | | | | | | | | | |
| | D Sanguinetti | 6 | 5 | 6 | | D Sanguinetti | 5 | 3 | | | | | | | | | | | | | | |
| WC | W Odesnik | 4 | 2 | | 4 | J Blake | 7 | 6 | | | | | | | | | | | | | | |
| 4 | J Blake | 6 | 6 | | | | | | | | | | | 5 | A Pavel | 4 | 7$^7$ | 4 | | | | |
| 6 | R Ginepri | 6$^5$ | 4 | | | | | | | | | | | | T Haas | 6 | 6$^4$ | 6 | | | | |
| | T Haas | 7$^7$ | 6 | | | T Haas | 6 | 6 | | | | | | | | | | | | | | |
| | T Enqvist | 4 | 4 | | | P Goldstein | 4 | 2 | | | | | | | | | | | | | | |
| | P Goldstein | 6 | 6 | | | | | | | | T Haas | 6 | 6 | | | | | | | | | |
| | D Tursunov | 6$^3$ | 6 | 7 | | | | | | | D Tursunov | 2 | 0 | | | | | | | | | |
| | I Karlović | 7$^7$ | 4 | 5 | | D Tursunov | 6 | 3 | 6 | | | | | | | | | | | | | |
| | A Bogomolov Jr. | 6 | 6 | | | A Bogomolov Jr. | 2 | 6 | 2 | | | | | | | | | | | | | |
| 2 | M Fish | 3 | 1 | | | | | | | | | | | | | | | | | | | |