| Singles | |
|---|---|
| 2004 Siebel Open | |
| 2003 Champion |
|
| Champion |
|
| Runner-up |
|
| Final score | 7–6 (15–13), 6–4 |
Andre Agassi was the defending champion but lost in the semifinals to Mardy Fish.
Andy Roddick won in the final 7–6 (15–13), 6–4 against Fish.
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.