| Order / Lane | Bib | ATHLETE | COUNTRY | PB | SB 2017 | 
|---|---|---|---|---|---|
| 2 | 1413 | Fred KERLEY |  USA | 43.70 | 43.70 | 
| 3 | 1266 | Abdalelah Haroun |  QAT | 44.27 | 44.64 | 
| 4 | 667 | Steven GARDINER |  BAH | 43.89 | 43.89 | 
| 5 | 1071 | Nathon ALLEN |  JAM | 44.19 | 44.19 | 
| 6 | 1282 | Wayde VAN NIEKERK |  RSA | 43.03 | 43.62 | 
| 7 | 708 | Isaac MAKWALA |  BOT | 43.72 | 43.84 | 
| 8 | 1084 | Demish GAYE |  JAM | 44.55 | 44.55 | 
| 9 | 712 | Baboloki THEBE |  BOT | 44.02 | 44.02 |