Men's 400m Round 1 - Heat 3
samedi 13 août 2016, 00h21 GMT – 05h21 GMT
| Nom | Temps | |
|---|---|---|
| 1 |  Wayde Van Niekerk | 45.26″ |
| 2 |  Luguelín Santos | + 0.35″ |
| 3 | Javon Francis | + 0.62″ |
| 4 |  Jonathan Borlee | + 0.75″ |
| 5 | Alphas Leken Kishoyian | + 1.48″ |
| 6 | Brandon Valentine-Parris | + 2.36″ |