| Order / Lane | Bib | ATHLETE | COUNTRY | PB | SB 2021 | 
|---|---|---|---|---|---|
| 1 | RSA | South Africa U20 | 
                             
                            RSA
                         | 
                            43.25 | |
| 2 | NAM | Namibia U20 | 
                             
                            NAM
                         | 
                            43.76 | |
| 3 | POL | Poland U20 | 
                             
                            POL
                         | 
                            42.68 | |
| 4 | NGR | Nigeria U20 | 
                             
                            NGR
                         | 
                            42.39 | |
| 5 | JAM | Jamaica U20 | 
                             
                            JAM
                         | 
                            41.02 | |
| 6 | ITA | Italy U20 | 
                             
                            ITA
                         | 
                            42.84 | |
| 7 | CZE | Czech Republic U20 | 
                             
                            CZE
                         | 
                            42.98 | |
| 8 | FIN | Finland U20 | 
                             
                            FIN
                         | 
                            43.37 |