| Champ: |  Andy Roddick |
| Runner: | Nicolas Kiefer |
| Score: | 6–2, 6–3 |
| Draw: | 48 (6 / 3) |
| Seeds: | 16 |
| Type: | singles doubles |
| Main Name: | Indianapolis Tennis Championships |
See main article: 2004 RCA Championships. Andy Roddick was the defending champion and successfully defended his title, defeating Nicolas Kiefer, 6–2, 6–3 in the final.