Heats
dimanche 6 août 2017, 12h05 GMT – 12h05 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Yasmaní Copello | Turkey | 49.13″ |
| 2 |  Juander Santos | Dominican Republic | + 0.06″ |
| 3 |  Mamadou Kasse Hanne | FFA - France Athlétisme | + 0.21″ |
| 4 | TJ Holmes | United States | + 0.22″ |
| 5 | Abderrahman Samba | Qatar | + 0.26″ |
| 6 |  Marcio Teles | Brazil | + 0.28″ |
| 7 |  Patryk Dobek | Poland | + 0.29″ |
| 8 | Kerron Clement | United States | + 0.33″ |
| 9 |  Ludvy Vaillant | FFA - France Athlétisme | + 0.36″ |
| 10 | Karsten Warholm | Norway | + 0.37″ |
| 11 | Haron Koech | Kenya | + 0.42″ |
| 12 | Jack Green | Great Britain | + 0.42″ |
| 13 | Eric Futch | United States | + 0.44″ |
| 14 |  Takatoshi Abe | Japan | + 0.52″ |
| 15 | Guillermo Ruggeri | Argentina | + 0.56″ |
| 16 |  Jaheel Hyde | Jamaica | + 0.59″ |
| 17 | Abdelmalik Lahoulou | Algeria | + 0.65″ |
| 18 | Thomas Barr | Ireland | + 0.66″ |
| 19 | José Bencosme de Leon | Italy | + 0.66″ |
| 20 | Jaak-Heinrich Jagor | Estonia | + 0.68″ |
| 21 | Ricardo Cunningham | Jamaica | + 0.78″ |
| 22 | Kemar Mowatt | Jamaica | + 0.87″ |
| 23 | Victor Coroller | FFA - France Athlétisme | + 0.87″ |
| 24 |  Kariem Hussein | Switzerland | + 0.99″ |
| 25 | Hederson Estefani | Brazil | + 1.09″ |
| 26 | Jordin Andrade | Cape Verde | + 1.19″ |
| 27 | Javier Culson | Puerto Rico | + 1.2″ |
| 28 | Yusuke Ishida | Japan | + 1.22″ |
| 29 | Lorenzo Vergani | Italy | + 1.24″ |
| 30 | Sergio Fernández | Spain | + 1.25″ |
| 31 | Ryo Kajiki | Japan | + 2.23″ |
| 32 | Creve armando Machava | Mozambique | + 2.58″ |
| 33 | José Luís Gaspar | Cuba | + 2.69″ |
| 34 | Mehboob Ali | Pakistan | + 3.11″ |
| 35 | Ephraim Lerkin | Papua New Guinea | + 3.23″ |
| 36 | Pablo Andrés Ibáñez | El Salvador | + 3.59″ |
| Michael Stigler | United States | DQ | |
| Kyron McMaster | British Virgin Islands | DQ | |
| Eric Cray | Philippines | DQ | |
| Rasmus Mägi | Estonia | DNS |