400 m Freestyle, Men
| Competition | 2003 USA Swimming National Championships (Outdoor/LCM) |
|---|---|
| Venue |
College Park, Maryland
 USA
|
| Held | 8 August 2003 |
| Status | Medal |
| Competitors | 8 |
| Countries | 2 |
College Park, Maryland
| Pos | Athlete(s) | Country | Mark | ||
|---|---|---|---|---|---|
| 🥇 | Michael Phelps North Baltimore Aquatic Club |
USA |
3:46.73 | * | |
| 🥈 | Justin Mortimer Mission Viejo Nadadores |
USA |
3:51.74 | ||
| 🥉 | Brian Johns |  CAN |
3:53.84 | ||
| 4 | Mark Johnston | CAN |
3:54.17 | ||
| 5 | Larsen Jensen Mission Viejo Nadadores |
USA |
3:54.98 | ||
| 6 | Peter Vanderkaay Club Wolverine |
USA |
3:55.45 | ||
| 7 | Matthew Owen Santa Cruz County Aquatic |
USA |
3:56.39 | ||
| 8 | Scott Kaufmann Reno Aquatic Club |
USA |
3:59.17 |