| Order / Lane | ATHLETE | COUNTRY | PB | SB 2010 | 
|---|---|---|---|---|
| 1 | Thailand Junior |  THA | 39.66 | 39.82 | 
| 2 | Great Britain & N.I. Junior |  GBR | 39.05 | 39.91 | 
| 3 | Jamaica Junior |  JAM | 39.05 | 39.74 | 
| 4 | Trinidad and Tobago Junior |  TTO | 39.17 | 39.77 | 
| 5 | Japan Junior |  JPN | 39.30 | 39.98 | 
| 6 | United States Junior |  USA | 38.66 | 39.69 | 
| 7 | Nigeria Junior |  NGR | 39.54 | 39.95 | 
| 8 | Germany Junior |  GER | 39.25 | 39.91 |