Pos  | Rank  | Heat  | Bib | Athlete | Mark  | Details  | Reaction Time  | |
|---|---|---|---|---|---|---|---|---|
1  | 1  | 1  | 3295 | QAT | 48.38   | Q  | 0.200  | |
2  | 2  | 1  | 1318 | BRA | 48.42   | Q  | 0.152  | |
3  | 1  | 2  | 2592 | JAM | 48.54   | Q  | 0.184  | |
4  | 1  | 5  | 3907 | USA | 48.60   | Q  | 0.209  | |
5  | 2  | 2  | 3968 | USA | 48.61   | Q  | 0.185  | |
6  | 1  | 3  | 3086 | NOR | 48.65   | Q  | 0.157  | |
7  | 2  | 5  | 1824 | EST | 48.73   | Q  | 0.160  | |
8  | 1  | 4  | 2456 | IVB | 48.79   | Q  | 0.184  | |
9  | 3  | 1  | 1008 | ALG | 48.83 SB  | Q  | 0.149  | |
10  | 2  | 4  | 3668 | TUR | 49.00   | Q  | 0.188  | |
11  | 2  | 3  | 2341 | IRL | 49.02   | Q  | 0.147  | |
12  | 4  | 1  | 2611 | JAM | 49.06   | Q  | 0.139  | |
13  | 3  | 3  | 2439 | ITA | 49.11   | Q  | 0.126  | |
14  | 3  | 4  | 2626 | JAM | 49.18 SB  | Q  | 0.157  | |
15  | 4  | 3  | 2154 | GER | 49.19 SB  | Q  | 0.145  | |
16  | 3  | 2  | 2724 | JPN | 49.21   | Q  | 0.184  | |
17  | 4  | 4  | 3939 | USA | 49.23   | Q  | 0.192  | |
17  | 5  | 1  | 1979 | FRA | 49.23   | q  | 0.152  | |
19  | 5  | 3  | 1958 | FRA | 49.39   | q  | 0.152  | |
20  | 5  | 4  | 2145 | GER | 49.50 SB  | q  | 0.169  | |
21  | 3  | 5  | 3444 | RSA | 49.51 SB  | Q  | 0.147  | |
22  | 4  | 5  | 3026 | NED | 49.55   | Q  | 0.181  | |
23  | 5  | 5  | 1637 | CZE | 49.59   | q  | 0.143  | |
24  | 6  | 3  | 1333 | BRA | 49.70 SB  | 0.154  | ||
25  | 4  | 2  | 2172 | GER | 49.73   | Q  | 0.215  | |
26  | 6  | 1  | 2274 | HUN | 49.80   | 0.151  | ||
27  | 7  | 3  | 1564 | CRC | 49.92   | 0.183  | ||
28  | 6  | 5  | 2683 | JPN | 49.98   | 0.166  | ||
29  | 6  | 4  | 2702 | JPN | 50.30   | 0.154  | ||
30  | 5  | 2  | 2962 | MOZ | 50.37 SB  | 0.159  | ||
31  | 6  | 2  | 3649 | TUN | 50.58   | 0.152  | ||
32  | 7  | 4  | 1562 | CPV | 50.64 SB  | 0.202  | ||
33  | 7  | 5  | 2299 | IND | 50.77   | 0.167  | ||
34  | 7  | 1  | 3602 | TPE | 50.96 =SB  | 0.158  | ||
35  | 7  | 2  | 1791 | ESP | 51.51   | 0.152  | ||
36  | 8  | 2  | 3457 | SEY | 51.67   | 0.151  |