Semifinal
mercredi 2 octobre 2019, 19h35 GMT – 19h35 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Steven Gardiner | Bahamas | 44.13″ |
| 2 |  Kirani James | Grenada | + 0.1″ |
| 3 |  Fred Kerley | United States | + 0.12″ |
| 4 | Emmanuel Kipkurui Korir | Kenya | + 0.24″ |
| 5 | Machel Cedenio | Trinidad & Tobago | + 0.28″ |
| 6 |  Anthony José Zambrano | Colombia | + 0.42″ |
| 7 |  Demish Gaye | Jamaica | + 0.53″ |
| 8 | Akeem Bloomfield | Jamaica | + 0.64″ |
| 9 |  Davide Re | Italy | + 0.72″ |
| 10 |  Vernon Norwood | United States | + 0.87″ |
| 11 |  Leungo Scotch | Botswana | + 0.87″ |
| 12 |  Jonathan Sacoor | Belgium | + 0.9″ |
| 13 | Julian Walsh | Japan | + 1″ |
| 14 | Rabah Yousif | Great Britain | + 1.02″ |
| 15 | Jhon Alejandro Perlaza | Colombia | + 1.04″ |
| 16 |  Thapelo Phora | South Africa | + 1.11″ |
| 17 | Abbas Abubakar Abbas | Bahrain | + 1.13″ |
| 18 | Nathan Strother | United States | + 1.21″ |
| 19 | Philip Osei | Canada | + 1.31″ |
| 20 |  Steven Solomon | Australia | + 1.41″ |
| 21 | Alphas Leken Kishoyian | Kenya | + 1.42″ |
| 22 |  Michael Norman | United States | + 1.81″ |
| 23 | Mazen Al Yasen | Saudi Arabia | + 1.98″ |
| Yousef Karam | Kuwait | DNS |