| Order / Lane | Bib | ATHLETE | COUNTRY | PB | SB 2021 | 
|---|---|---|---|---|---|
| 2 | 1270 | Isaac MAKWALA |  BOT | 43.72 | 44.47 | 
| 3 | 3015 | Liemarvin BONEVACIA |  NED | 44.62 | 44.62 | 
| 4 | 2235 | Kirani JAMES |  GRN | 43.74 | 43.88 | 
| 5 | 1551 | Anthony José ZAMBRANO |  COL | 43.93 | 43.93 | 
| 6 | 3913 | Michael CHERRY |  USA | 44.35 | 44.35 | 
| 7 | 1136 | Steven GARDINER |  BAH | 43.48 | 44.14 | 
| 8 | 3958 | Michael NORMAN |  USA | 43.45 | 44.07 | 
| 9 | 2634 | Christopher TAYLOR |  JAM | 44.88 | 44.92 |