| Singles | |
|---|---|
| 2004 Legg Mason Tennis Classic | |
| Champion |  Lleyton Hewitt |
| Runner-up |  Gilles Müller |
| Score | 6–3, 6–4 |
| Draw | 32 (4Q / 3WC) |
| Seeds | 8 |
Tim Henman was the defending champion but chose to participate in the 2004 Summer Olympics.
Lleyton Hewitt won in the final 6–3, 6–4 against Gilles Müller.
Andre Agassi (semifinals) Lleyton Hewitt (champion)
Sjeng Schalken (first round, retired due to virus) Robby Ginepri (semifinals) James Blake (first round)
Alberto Martín (second round)
Cyril Saulnier (quarterfinals)
Dmitry Tursunov (second round)| Semifinals | Final | ||||||||||||
| 1 | Andre Agassi | 4 | 5 | ||||||||||
| Gilles Müller | 6 | 7 | |||||||||||
| Gilles Müller | 3 | 4 | |||||||||||
| 2 | Lleyton Hewitt | 6 | 6 | ||||||||||
| 4 | Robby Ginepri | 3 | 4 | ||||||||||
| 2 | Lleyton Hewitt | 6 | 6 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | A Agassi | 6 | 6 | ||||||||||||||||||||||||
| WC | P Goldstein | 4 | 2 | 1 | A Agassi | 6 | 6 | ||||||||||||||||||||
| WC | B Baker | 3 | 6 | 62 |  K Pless | 4 | 2 | ||||||||||||||||||||
| K Pless | 6 | 3 | 77 | 1 | A Agassi | 6 | 6 | ||||||||||||||||||||
| WC | D Yoo | 2 | 2 | P-H Mathieu | 4 | 4 | |||||||||||||||||||||
| P-H Mathieu | 6 | 6 | P-H Mathieu | 77 | 6 | ||||||||||||||||||||||
| SE |  A García | 6 | 6 | SE | A García | 64 | 4 | ||||||||||||||||||||
| 5 | J Blake | 1 | 4 | 1 | A Agassi | 4 | 5 | ||||||||||||||||||||
| 3 | S Schalken | 1 | 1 | r | G Müller | 6 | 7 | ||||||||||||||||||||
| G Müller | 6 | 0 | G Müller | 7 | 5 | 6 | |||||||||||||||||||||
| J-M Gambill | 7 | 6 | J-M Gambill | 5 | 7 | 2 | |||||||||||||||||||||
 S Koubek | 5 | 4 | G Müller | 7 | 67 | 6 | |||||||||||||||||||||
| J Salzenstein | 4 | 61 | Q |  M Kratochvil | 5 | 79 | 2 | ||||||||||||||||||||
| Q | M Kratochvil | 6 | 77 | Q | M Kratochvil | 77 | 77 | ||||||||||||||||||||
| O Patience | 7 | 4 | 4 | 8 | D Tursunov | 65 | 64 | ||||||||||||||||||||
| 8 | D Tursunov | 5 | 6 | 6 | |||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | A Martín | 4 | 6 | 77 | |||||||||||||||||||||||
 W Ferreira | 6 | 4 | 62 | 6 | A Martín | 64 | 7 | 62 | |||||||||||||||||||
| R Sluiter | 65 | 77 | 77 | R Sluiter | 77 | 5 | 77 | ||||||||||||||||||||
| T Martin | 77 | 63 | 65 | R Sluiter | 3 | 63 | |||||||||||||||||||||
| Q |  N Zimonjić | 79 | 5 | 3 | 4 | R Ginepri | 6 | 77 | |||||||||||||||||||
| Q |  H Levy | 67 | 7 | 6 | Q | H Levy | 6 | 2 | 1 | ||||||||||||||||||
| À Corretja | 64 | 6 | 3 | 4 | R Ginepri | 4 | 6 | 6 | |||||||||||||||||||
| 4 | R Ginepri | 77 | 4 | 6 | 4 | R Ginepri | 3 | 4 | |||||||||||||||||||
| 7 | C Saulnier | 6 | 6 | 2 | L Hewitt | 6 | 6 | ||||||||||||||||||||
| A Dupuis | 3 | 4 | 7 | C Saulnier | 6 | 77 | |||||||||||||||||||||
| Q |  J Wang | 6 | 61 | 4 |  G Elseneer | 3 | 62 | ||||||||||||||||||||
| G Elseneer | 2 | 77 | 6 | 7 | C Saulnier | 3 | 6 | 65 | |||||||||||||||||||
 A Falla | 3 | 6 | 6 | 2 | L Hewitt | 6 | 3 | 77 | |||||||||||||||||||
| J Gimelstob | 6 | 4 | 3 | A Falla | 3 | 2 | |||||||||||||||||||||
| K Carlsen | 1 | 2 | 2 | L Hewitt | 6 | 6 | |||||||||||||||||||||
| 2 | L Hewitt | 6 | 6 | ||||||||||||||||||||||||
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