| POS | Rank | Heat | BIB | ATHLETE | COUNTRY | RESULTS | ms* |
|---|---|---|---|---|---|---|---|
| 1 | 1 | 2 | 1757 | Antti SAINIO |
FIN |
49.36 Q WU20L | .351 |
| 2 | 2 | 2 | 1681 | Michal RADA |
CZE |
49.36 Q WU20L | .352 |
| 3 | 3 | 2 | 2340 | Vance NILSSON |
USA |
49.82 q | |
| 4 | 1 | 1 | 2190 | Njabulo MBATHA |
RSA |
49.90 Q | |
| 5 | 2 | 1 | 1790 | Sam LUNT |
GBR |
50.00 Q NU20R | |
| 6 | 4 | 2 | 1709 | Joaquin ALONSO |
ESP |
50.22 q NU20R | |
| 7 | 3 | 1 | 1971 | Kyo KIKUTA |
JPN |
51.04 | |
| 8 | 1 | 3 | 1966 | Daniel WRIGHT |
JAM |
51.11 Q | |
| 9 | 2 | 3 | 1626 | Ramón FUENZALIDA |
CHI |
51.33 Q PB | |
| 10 | 4 | 1 | 2222 | Akalanka KUDA LIYANAGE |
SRI |
51.45 | |
| 11 | 5 | 2 | 1901 | Fintan DEWHIRST |
IRL |
51.65 | |
| 12 | 3 | 3 | 1967 | Kairi GONDA |
JPN |
51.80 | |
| 13 | 6 | 2 | 1900 | David DAVITT |
IRL |
51.93 | |
| 14 | 7 | 2 | 2014 | Ali Abdulfattah ALRUMAYH |
KSA |
52.25 PB | |
| 15 | 5 | 1 | 2214 | Mitja ZUBIN |
SLO |
52.55 | |
| 16 | 4 | 3 | 2059 | Jose Eduardo AGUADO |
MEX |
52.57 | |
| 17 | 5 | 3 | 1584 | Lucas DE ALMEIDA |
BRA |
52.67 PB | |
| 18 | 6 | 3 | 2360 | Premier WYNN |
USA |
52.76 | |
| 19 | 7 | 3 | 2283 | Cheyne WEST |
TTO |
53.09 | |
| 20 | 6 | 1 | 1914 | Paolo BOLOGNESI |
ITA |
53.92 | |
| 21 | 8 | 2 | 1963 | Trevoy SMITH |
JAM |
54.24 | |
| 22 | 7 | 1 | 2065 | Maximiliano NUÑEZ |
MEX |
57.96 | |
| 23 | 8 | 3 | 1637 | Jingwei GUO |
CHN |
1:03.89 | |
| 1 | 1698 | Joel VON DE AHÉ |
DEN |
DNS |
ms - Milliseconds - shown when two or more competitors finish with the same time down to hundredths of a second