Men's 100m Butterfly Semifinal 1
vendredi 12 août 2016, 02h34 GMT – 07h34 GMT
| Nom | Temps | |
|---|---|---|
| 1 |  László Cseh | 51.57″ |
| 2 |  Michael Phelps | + 0.01″ |
| 3 |  Konrad Czerniak | + 0.23″ |
| 4 | Piero Codia | + 0.25″ |
| 5 |  Santo Condorelli | + 0.26″ |
| 6 | Grant Irvine | + 0.3″ |
| 7 |  James Guy | + 0.53″ |
| 8 | Zheng Wen Quah | + 0.69″ |