| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time |
|---|---|---|---|---|---|
| 1 | 2539 | Kirani JAMES |
GRN
|
44.02 Q SB | 0.144 |
| 2 | 3090 | LaShawn Merritt |
USA
|
44.21 Q | 0.271 |
| 3 | 2125 | Karabo SIBANDA |
BOT
|
44.47 q PB | 0.174 |
| 4 | 2327 | Luguelín SANTOS |
DOM
|
44.71 SB | 0.155 |
| 5 | 2620 | Javon FRANCIS |
JAM
|
44.96 | 0.170 |
| 6 | 2262 | Nery Brenes |
CRC
|
45.02 | 0.181 |
| 7 | 2780 | Liemarvin BONEVACIA |
NED
|
45.03 SB | 0.166 |
| 8 | 2980 | Lalonde Gordon |
TTO
|
45.13 | 0.157 |
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time |
|---|---|---|---|---|---|
| 1 | 2977 | Machel CEDENIO |
TTO
|
44.39 Q | 0.243 |
| 2 | 2910 | Wayde VAN NIEKERK |
RSA
|
44.45 Q | 0.156 |
| 3 | 2304 | Pavel MASLÁK |
CZE
|
45.06 SB | 0.185 |
| 4 | 2929 | Luka JANEŽIČ |
SLO
|
45.07 NR | 0.154 |
| 5 | 3102 | David Verburg |
USA
|
45.61 | 0.159 |
| 6 | 2623 | Rusheen MCDONALD |
JAM
|
46.12 | 0.182 |
| 7 | 2880 | Abdalelah Haroun |
QAT
|
46.66 | 0.173 |
| 2126 | Baboloki THEBE |
BOT
|
DNS |
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time |
|---|---|---|---|---|---|
| 1 | 2540 | Bralon TAPLIN |
GRN
|
44.44 Q | 0.171 |
| 2 | 2461 | Matthew HUDSON-SMITH |
GBR
|
44.48 Q PB | 0.143 |
| 3 | 2171 | Ali Khamis Khamis |
BRN
|
44.49 q NR | 0.145 |
| 4 | 3093 | Gil Roberts |
USA
|
44.65 SB | 0.151 |
| 5 | 2065 | Steven GARDINER |
BAH
|
44.72 | 0.156 |
| 6 | 2275 | Yoandys Lescay |
CUB
|
45.00 PB | 0.216 |
| 7 | 2849 | Rafał Omelko |
POL
|
45.28 | 0.164 |
| 8 | 2121 | Isaac MAKWALA |
BOT
|
46.60 | 0.173 |