Semifinal
lundi 7 août 2017, 21h20 GMT – 21h20 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Kerron Clement | United States | 48.35″ |
| 2 | Karsten Warholm | Norway | + 0.08″ |
| 3 | Juander Santos | Dominican Republic | + 0.24″ |
| 4 |  Kemar Mowatt | Jamaica | + 0.31″ |
| 5 | Abderrahman Samba | Qatar | + 0.4″ |
| 6 |  Yasmaní Copello | Turkey | + 0.56″ |
| 7 | TJ Holmes | United States | + 0.77″ |
| 8 |  Kariem Hussein | Switzerland | + 0.78″ |
| 9 | Eric Futch | United States | + 0.95″ |
| 10 | Abdelmalik Lahoulou | Algeria | + 0.98″ |
| 11 |  Patryk Dobek | Poland | + 1.05″ |
| 12 | Jaheel Hyde | Jamaica | + 1.4″ |
| 13 | Jack Green | Great Britain | + 1.58″ |
| 14 |  Takatoshi Abe | Japan | + 1.58″ |
| 15 |  Ludvy Vaillant | FFA - France Athlétisme | + 1.6″ |
| 16 | José Bencosme de Leon | Italy | + 1.94″ |
| 17 |  Mamadou Kasse Hanne | FFA - France Athlétisme | + 2″ |
| 18 | Haron Koech | Kenya | + 2.05″ |
| 19 | Jaak-Heinrich Jagor | Estonia | + 2.08″ |
| 20 | Ricardo Cunningham | Jamaica | + 2.19″ |
| 21 | Victor Coroller | FFA - France Athlétisme | + 7.34″ |
| Guillermo Ruggeri | Argentina | DQ | |
| Thomas Barr | Ireland | DNS | |
 Marcio Teles | Brazil | DNF |