| Order / Lane | ATHLETE | COUNTRY | PB | SB 2008 | 
|---|---|---|---|---|
| 2 | Kenji Narisako |  JPN | 47.93 | 48.87 | 
| 3 | Pieter de Villiers |  RSA | 48.46 | 48.71 | 
| 4 | Bershawn Jackson |  USA | 47.30 | 48.15 | 
| 5 | Harouna Garba |  NIG | ||
| 6 | Mahau SUGUIMATI |  BRA | 49.15 | 49.15 | 
| 7 | Edivaldo Monteiro |  POR | 49.10 | 49.94 | 
| 8 | Jonathan Williams |  BIZ | 48.88 | 49.42 | 
| Order / Lane | ATHLETE | COUNTRY | PB | SB 2008 | 
|---|---|---|---|---|
| 3 | Aleksandr Derevyagin |  RUS | 49.00 | 49.00 | 
| 4 | Bayano Kamani |  PAN | 47.84 | 49.60 | 
| 5 | Alwyn Myburgh |  RSA | 48.09 | 48.99 | 
| 6 | Danny McFarlane |  JAM | 48.00 | 48.39 | 
| 7 | Ibrahim Maïga |  MLI | 49.13 | 49.82 | 
| 8 | Angelo Taylor |  USA | 47.50 | 48.42 | 
| Order / Lane | ATHLETE | COUNTRY | PB | SB 2008 | 
|---|---|---|---|---|
| 3 | Yan Meng |  CHN | 49.03 | 49.85 | 
| 4 | Marek Plawgo |  POL | 48.12 | 48.69 | 
| 5 | Markino Buckley |  JAM | 49.08 | 49.08 | 
| 6 | Aleksey Pogorelov |  KGZ | 49.42 | 49.42 | 
| 7 | Javier Culson |  PUR | 48.87 | 48.87 | 
| 8 | L.J. van Zyl |  RSA | 48.05 | 48.22 | 
| Order / Lane | ATHLETE | COUNTRY | PB | SB 2008 | 
|---|---|---|---|---|
| 2 | Yevgeniy Meleshenko |  KAZ | 48.46 | 49.22 | 
| 3 | Isa Phillips |  JAM | 48.51 | 48.78 | 
| 4 | Mowen Boino |  PNG | 50.37 | 51.67 | 
| 5 | Felix Sánchez |  DOM | 47.25 | |
| 6 | Kerron Clement |  USA | 47.24 | 47.79 | 
| 7 | Dai Tamesue |  JPN | 47.89 | 49.17 | 
| 8 | PeriklÃs Iakovákis |  GRE | 47.82 | 48.80 |