Semifinal 1
mercredi 2 octobre 2019, 19h35 GMT – 19h35 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Fred Kerley | United States | 44.25″ |
| 2 |  Emmanuel Kipkurui Korir | Kenya | + 0.12″ |
| 3 |  Davide Re | Italy | + 0.6″ |
| 4 |  Jonathan Sacoor | Belgium | + 0.78″ |
| 5 |  Thapelo Phora | South Africa | + 0.99″ |
| 6 | Abbas Abubakar Abbas | Bahrain | + 1.01″ |
| 7 | Nathan Strother | United States | + 1.09″ |
| 8 | Mazen Al Yasen | Saudi Arabia | + 1.86″ |