Countdown
First 3 in each heat (Q) and the next 6 fastest (q)
| POS | Rank | Heat | BIB | ATHLETE | COUNTRY | RESULTS |
|---|---|---|---|---|---|---|
| 1 | 1 | 4 | 2743 | Javier Culson |
 PUR |
48.33 Q |
| 2 | 2 | 4 | 3212 | Kerron Clement |
 USA |
48.48 Q SB |
| 3 | 3 | 4 | 1465 | Omar Cisneros |
 CUB |
48.63 Q SB |
| 4 | 1 | 3 | 1812 | David Greene |
 GBR |
48.98 Q |
| 5 | 4 | 4 | 1065 | Tristan Thomas |
 AUS |
49.13 q SB |
| 5 | 1 | 2 | 3258 | Michael Tinsley |
USA |
49.13 Q |
| 7 | 5 | 4 | 1843 | Rhys Williams |
GBR |
49.17 q SB |
| 8 | 6 | 4 | 1135 | Michaël Bultheel |
 BEL |
49.18 q PB |
| 9 | 1 | 1 | 1483 | Amaurys R. Valle |
CUB |
49.19 Q PB |
| 10 | 2 | 3 | 2947 | Emir Bekric |
 SRB |
49.21 Q NR |
| 11 | 2 | 1 | 1039 | Brendan Cole |
AUS |
49.24 Q PB |
| 11 | 1 | 6 | 1563 | Felix Sánchez |
 DOM |
49.24 Q |
| 13 | 1 | 5 | 3255 | Angelo Taylor |
USA |
49.29 Q |
| 14 | 2 | 2 | 2176 | Leford Green |
 JAM |
49.30 Q |
| 15 | 3 | 2 | 2528 | Kurt Couto |
 MOZ |
49.31 Q |
| 16 | 3 | 1 | 2571 | Cristian Morton |
 NGR |
49.34 Q |
| 17 | 3 | 3 | 2128 | José Reynaldo Bencosme De Leon |
 ITA |
49.35 Q |
| 18 | 2 | 5 | 3043 | Jehue Gordon |
 TTO |
49.37 Q |
| 19 | 4 | 3 | 2932 | Brent LaRue |
 SLO |
49.38 q PB |
| 20 | 4 | 2 | 2741 | Eric Alejandro |
PUR |
49.39 q |
| 21 | 2 | 6 | 1811 | Jack Green |
GBR |
49.49 Q |
| 22 | 3 | 6 | 2910 | Mamadou Kasse Hann |
 SEN |
49.63 Q |
| 23 | 4 | 1 | 1155 | Kenneth Medwood |
 BIZ |
49.78 q |
| 24 | 5 | 3 | 2746 | Jamele Mason |
PUR |
49.89 |
| 25 | 4 | 6 | 2239 | Tetsuya Tateno |
 JPN |
49.95 |
| 26 | 5 | 6 | 2186 | Josef Robertson |
JAM |
49.98 |
| 27 | 5 | 2 | 1666 | Rasmus Mägi |
 EST |
50.05 |
| 28 | 3 | 5 | 3140 | Stanislav Melnykov |
 UKR |
50.13 Q |
| 29 | 6 | 2 | 1559 | Winder Cuevas |
DOM |
50.15 SB |
| 30 | 4 | 5 | 1921 | Silvio Schirrmeister |
 GER |
50.21 |
| 31 | 5 | 1 | 2172 | Roxroy Cato |
JAM |
50.22 |
| 32 | 6 | 1 | 3032 | Chieh Chen |
 TPE |
50.27 |
| 32 | 5 | 5 | 1981 | Periklís Iakovákis |
 GRE |
50.27 |
| 34 | 6 | 5 | 2791 | L.J. van Zyl |
 RSA |
50.31 |
| 35 | 6 | 6 | 2312 | Bonface Mucheru |
 KEN |
50.33 |
| 35 | 7 | 5 | 1522 | Josef Prorok |
 CZE |
50.33 |
| 37 | 7 | 1 | 1353 | Zhilong Li |
 CHN |
50.36 |
| 37 | 7 | 4 | 2826 | Viacheslav Sakaev |
 RUS |
50.36 |
| 39 | 6 | 3 | 1345 | Wen Cheng |
CHN |
50.38 |
| 40 | 7 | 3 | 2309 | Vincent Kiplangat Kosgei |
KEN |
50.80 |
| 41 | 8 | 4 | 2714 | Jorge Paula |
 POR |
51.40 |
| 42 | 7 | 6 | 3329 | Artem Dyatlov |
 UZB |
51.55 |
| 43 | 8 | 5 | 2270 | Viktor Leptikov |
 KAZ |
51.67 |
| 44 | 8 | 3 | 2782 | Cornel Fredericks |
RSA |
52.29 |
| 45 | 8 | 6 | 3201 | Andrés Silva |
 URU |
53.38 |
| 46 | 9 | 4 | 1444 | Maoulida Daroueche |
 COM |
53.49 |
| 1 | 2225 | Takayuki Kishimoto |
JPN |
DQ | ||
| 3 | 3028 | Lankantien Lamboni |
 TOG |
DQ | ||
| 2 | 2231 | Akihiko Nakamura |
JPN |
DQ | ||
| 2 | 2970 | Kariem Hussein |
 SUI |
DNS |