| Order / Lane | ATHLETE | COUNTRY | PB | SB 2018 | 
|---|---|---|---|---|
| 1 | Spain U20 | 
                             
                            ESP
                         | 
                            39.59 | 39.99 | 
| 2 | Trinidad and Tobago U20 | 
                             
                            TTO
                         | 
                            39.17 | 39.67 | 
| 3 | Japan U20 | 
                             
                            JPN
                         | 
                            39.01 | 39.18 | 
| 4 | United States U20 | 
                             
                            USA
                         | 
                            38.66 | 39.49 | 
| 5 | Germany U20 | 
                             
                            GER
                         | 
                            39.13 | 39.13 | 
| 6 | Italy U20 | 
                             
                            ITA
                         | 
                            39.50 | 39.75 | 
| 7 | Jamaica U20 | 
                             
                            JAM
                         | 
                            38.97 | 39.56 | 
| 8 | Czech Republic U20 | 
                             
                            CZE
                         | 
                            39.41 | 39.91 |