| Order / Lane | Bib | ATHLETE | COUNTRY | PB | SB 2021 | 
|---|---|---|---|---|---|
| 2 | 3853 | Quanera HAYES | 
                             
                            USA
                         | 
                            49.72 | 49.78 | 
| 3 | 1583 | Roxana GÓMEZ | 
                             
                            CUB
                         | 
                            49.71 | 49.71 | 
| 4 | 2501 | Candice MCLEOD | 
                             
                            JAM
                         | 
                            49.51 | 49.51 | 
| 5 | 1684 | Marileidy PAULINO | 
                             
                            DOM
                         | 
                            49.38 | 49.38 | 
| 6 | 2502 | Stephenie Ann MCPHERSON | 
                             
                            JAM
                         | 
                            49.34 | 49.34 | 
| 7 | 1131 | Shaunae MILLER-UIBO | 
                             
                            BAH
                         | 
                            48.37 | 49.08 | 
| 8 | 2033 | Jodie WILLIAMS | 
                             
                            GBR
                         | 
                            49.97 | 49.97 | 
| 9 | 3847 | Allyson FELIX | 
                             
                            USA
                         | 
                            49.26 | 49.89 |