Semifinal
lundi 30 septembre 2019, 19h50 GMT – 19h50 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Noah Lyles | United States | 19.86″ |
| 2 |  Alex Quinonez | Ecuador | + 0.09″ |
| 3 |  Zhenye Xie | China | + 0.17″ |
| 4 |  Adam Gemili | Great Britain | + 0.17″ |
| 5 |  Andre De Grasse | Canada | + 0.22″ |
| 6 |  Ramil Guliyev | Turkey | + 0.3″ |
| 7 |  Aaron Brown | Canada | + 0.34″ |
| 8 |  Kyle Greaux | Trinidad & Tobago | + 0.38″ |
| 9 | Yancarlos Martínez | Dominican Republic | + 0.42″ |
| 10 | Jereem Richards | Trinidad & Tobago | + 0.42″ |
| 11 |  Zharnel Hughes | Great Britain | + 0.44″ |
| 12 |  Taymir Burnet | Netherlands | + 0.48″ |
| 13 |  Brendon Rodney | Canada | + 0.48″ |
| 14 |  Anaso Jobodwana | South Africa | + 0.48″ |
| 15 |  Yohan Blake | Jamaica | + 0.51″ |
| 16 |  Rasheed Dwyer | Jamaica | + 0.68″ |
| 17 | Clarence Munyai | South Africa | + 0.69″ |
| 18 |  Serhiy Smelyk | Ukraine | + 0.69″ |
| 19 | Andre Ewers | Jamaica | + 0.75″ |
| 20 |  Reynier Mena | Cuba | + 0.75″ |
| 21 | Eseosa Desalu | Italy | + 0.87″ |
| 22 |  Divine Oduduru | Nigeria | + 0.98″ |
 Alex Wilson | Switzerland | DNF | |
| Miguel Francis | Great Britain | DNF |