| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Italy U20 | 
                                         
                                        ITA
                                     | 
                                    39.75 Q SB | 0.195 | 
| 2 | Czech Republic U20 | 
                                         
                                        CZE
                                     | 
                                    39.91 Q SB | 0.194 | 
| 3 | Ireland U20 | 
                                         
                                        IRL
                                     | 
                                    40.51 | 0.168 | 
| 4 | Hungary U20 | 
                                         
                                        HUN
                                     | 
                                    40.84 SB | 0.158 | 
| 5 | Ukraine U20 | 
                                         
                                        UKR
                                     | 
                                    41.09 SB | 0.178 | 
| 6 | Qatar U20 | 
                                         
                                        QAT
                                     | 
                                    41.35 | 0.166 | 
| Australia U20 | 
                                         
                                        AUS
                                     | 
                                    DNF | 0.166 | |
| Great Britain & NI U20 | 
                                         
                                        GBR
                                     | 
                                    DNF | 0.138 | 
| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Germany U20 | 
                                         
                                        GER
                                     | 
                                    39.13 Q WU20L | 0.177 | 
| 2 | Jamaica U20 | 
                                         
                                        JAM
                                     | 
                                    39.68 Q | 0.152 | 
| 3 | Poland U20 | 
                                         
                                        POL
                                     | 
                                    39.99 SB | 0.151 | 
| 4 | Finland U20 | 
                                         
                                        FIN
                                     | 
                                    40.26 SB | 0.178 | 
| 5 | Greece U20 | 
                                         
                                        GRE
                                     | 
                                    40.78 | 0.183 | 
| South Africa U20 | 
                                         
                                        RSA
                                     | 
                                    DQ | 0.163 | |
| Saudi Arabia U20 | 
                                         
                                        KSA
                                     | 
                                    DNS | 
| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Japan U20 | 
                                         
                                        JPN
                                     | 
                                    39.18 Q SB | 0.144 | 
| 2 | United States U20 | 
                                         
                                        USA
                                     | 
                                    39.49 Q SB | 0.141 | 
| 3 | Trinidad and Tobago U20 | 
                                         
                                        TTO
                                     | 
                                    39.67 q SB | 0.138 | 
| 4 | Spain U20 | 
                                         
                                        ESP
                                     | 
                                    39.99 q SB | 0.153 | 
| 5 | Bahamas U20 | 
                                         
                                        BAH
                                     | 
                                    40.85 | 0.263 | 
| 6 | Turkey U20 | 
                                         
                                        TUR
                                     | 
                                    40.87 | 0.138 | 
| 7 | India U20 | 
                                         
                                        IND
                                     | 
                                    41.11 | 0.170 |