| POS | Rank | Heat | BIB | ATHLETE | COUNTRY | RESULTS |
|---|---|---|---|---|---|---|
| 1 | 1 | 1 | USA | United States U20 |
USA |
3:03.97 Q WJL |
| 2 | 1 | 2 | JPN | Japan U20 |
JPN |
3:05.40 Q SB |
| 3 | 2 | 2 | JAM | Jamaica U20 |
JAM |
3:06.25 Q SB |
| 4 | 3 | 2 | BAH | Bahamas U20 |
BAH |
3:07.03 q NJR |
| 5 | 2 | 1 | BOT | Botswana U20 |
BOT |
3:07.80 Q SB |
| 6 | 1 | 3 | GBR | Great Britain & NI U20 |
GBR |
3:08.61 Q SB |
| 7 | 2 | 3 | RSA | South Africa U20 |
RSA |
3:09.11 Q SB |
| 8 | 3 | 1 | AUS | Australia U20 |
AUS |
3:09.22 q SB |
| 9 | 3 | 3 | NGR | Nigeria U20 |
NGR |
3:09.37 |
| 10 | 4 | 3 | TUR | Turkey U20 |
TUR |
3:10.07 NJR |
| 11 | 4 | 1 | CUB | Cuba U20 |
CUB |
3:10.60 SB |
| 12 | 4 | 2 | GER | Germany U20 |
GER |
3:10.75 |
| 13 | 5 | 3 | POL | Poland U20 |
POL |
3:10.94 SB |
| 14 | 6 | 3 | THA | Thailand U20 |
THA |
3:11.50 |
| 15 | 5 | 2 | CAN | Canada U20 |
CAN |
3:11.93 SB |
| 16 | 5 | 1 | TTO | Trinidad and Tobago U20 |
TTO |
3:12.06 |
| 17 | 6 | 1 | BEL | Belgium U20 |
BEL |
3:12.57 |
| 2 | PUR | Puerto Rico U20 |
PUR |
DQ R163.3(a) |