| Order / Lane | Bib | ATHLETE | COUNTRY | PB | SB 2016 | 
|---|---|---|---|---|---|
| 4 | NED | Netherlands U20 |  NED | 44.09 | 44.72 | 
| 5 | TTO | Trinidad and Tobago U20 |  TTO | 44.14 | 46.36 | 
| 6 | ECU | Ecuador U20 |  ECU | 44.88 | |
| 7 | JAM | Jamaica U20 |  JAM | 43.40 | 44.30 | 
| 8 | CZE | Czech Republic U20 |  CZE | 45.34 | 45.34 | 
| 9 | ESP | Spain U20 |  ESP | 45.10 | 45.10 | 
| Order / Lane | Bib | ATHLETE | COUNTRY | PB | SB 2016 | 
|---|---|---|---|---|---|
| 4 | POL | Poland U20 |  POL | 44.59 | |
| 5 | CAN | Canada U20 |  CAN | 44.77 | |
| 6 | USA | United States U20 |  USA | 43.29 | 45.16 | 
| 7 | FRA | France U20 |  FRA | 43.68 | 44.46 | 
| 8 | THA | Thailand U20 |  THA | 45.23 | 45.23 | 
| 9 | GBR | Great Britain and N. I. U20 |  GBR | 43.81 | 44.56 | 
| Order / Lane | Bib | ATHLETE | COUNTRY | PB | SB 2016 | 
|---|---|---|---|---|---|
| 4 | AUS | Australia U20 |  AUS | 44.86 | 45.39 | 
| 5 | RSA | South Africa U20 |  RSA | 45.07 | |
| 6 | GER | Germany U20 |  GER | 43.42 | 44.25 | 
| 7 | NZL | New Zealand U20 |  NZL | 45.04 | 45.04 | 
| 8 | ITA | Italy U20 |  ITA | 44.52 | 44.95 | 
| 9 | IRL | Ireland U20 |  IRL | 45.08 | 45.54 |