| Order / Lane | Bib | ATHLETE | COUNTRY | PB | SB 2004 | 
|---|---|---|---|---|---|
| 1 | 94 | Paulo Roberto Orlando |  BRA | 46.58 | 46.58 | 
| 2 | 30 | Sean Wroe |  AUS | 46.80 | 46.80 | 
| 3 | 91 | Obakeng Ngwigwa |  BOT | 46.64 | 46.64 | 
| 4 | 895 | LaShawn Merritt |  USA | 45.38 | 45.38 | 
| 5 | 712 | Valentin Kruglyakov |  RUS | 46.36 | 46.36 | 
| 6 | 761 | Nagmeldin Ali Abubakr |  SUD | 45.22 | 45.76 | 
| 7 | 880 | Keith Hinnant |  USA | 46.54 | 46.54 | 
| 8 | 831 | Serdar Tamac |  TUR | 46.94 | 46.94 |