| POS | ATHLETE | COUNTRY | MARK | Reaction Time |
|---|---|---|---|---|
| 1 | Jamaica Junior |
JAM
|
39.38 Q NJ | 0.170 |
| 2 | Trinidad and Tobago Junior |
TTO
|
39.50 Q NJ | 0.153 |
| 3 | France Junior |
FRA
|
39.93 q | 0.157 |
| 4 | Italy Junior |
ITA
|
40.16 q | 0.144 |
| 5 | Australia Junior |
AUS
|
40.51 PB | 0.143 |
| 6 | Greece Junior |
GRE
|
40.55 NJ | 0.170 |
| Chile Junior |
CHI
|
DQ | 0.118 | |
| Bahamas Junior |
BAH
|
DNS | 0.000 |
| POS | ATHLETE | COUNTRY | MARK | Reaction Time |
|---|---|---|---|---|
| 1 | United States Junior |
USA
|
39.18 Q WJL | 0.173 |
| 2 | Brazil Junior |
BRA
|
39.75 Q AJ | 0.129 |
| 3 | Japan Junior |
JPN
|
39.82 q | 0.128 |
| 4 | Germany Junior |
GER
|
39.85 q PB | 0.134 |
| 5 | New Zealand Junior |
NZL
|
40.35 PB | 0.162 |
| 6 | Poland Junior |
POL
|
40.59 | 0.160 |
| 7 | Singapore U20 |
SGP
|
41.87 NJ | 0.175 |
| South Africa Junior |
RSA
|
DNS | 0.000 |