| Order / Lane | Bib | ATHLETE | COUNTRY | PB | SB 2004 | 
|---|---|---|---|---|---|
| 1 | 93 | Diego Venâncio |  BRA | 50.39 | 50.39 | 
| 2 | 696 | L.J. van Zyl |  RSA | 48.89 | 49.71 | 
| 3 | 884 | Brandon Johnson |  USA | 48.85 | 48.85 | 
| 4 | 278 | Richard Davenport |  GBR | 50.20 | 50.20 | 
| 5 | 496 | Ibrahim Al-Hamaidi |  KSA | 49.55 | 49.55 | 
| 6 | 868 | Kerron Clement |  USA | 48.77 | 48.77 | 
| 7 | 686 | Wouter le Roux |  RSA | 49.45 | 49.45 | 
| 8 | 168 | Yasser Lismet |  CUB | 49.72 | 49.72 |