Semifinal 2
mercredi 9 août 2017, 21h55 GMT – 21h55 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Jereem Richards | Trinidad & Tobago | 20.14″ |
| 2 |  Abdul hakim Sani brown | Japan | + 0.29″ |
| 3 |  Yohan Blake | Jamaica | + 0.38″ |
| 4 |  Sydney Siame | Zambia | + 0.4″ |
| 5 | Kyree King | United States | + 0.45″ |
| 6 | Jan Volko | Slovakia | + 0.47″ |
| 7 |  Zharnel Hughes | Great Britain | + 0.71″ |
| 8 |  Alex Wilson | Switzerland | + 1.08″ |