Semifinal
dimanche 23 juillet 2017, 17h53 GMT – 17h53 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Caeleb Dressel | United States | 22.76″ |
| 2 |  Andriy Govorov | Ukraine | + 0.01″ |
| 3 | Nicholas Santos | Brazil | + 0.08″ |
| 4 | Benjamin Proud | Great Britain | + 0.16″ |
| 5 | Joseph Schooling | Singapore | + 0.17″ |
| 6 | Henrique Martins | Brazil | + 0.37″ |
| 7 | Tim Phillips | United States | + 0.49″ |
| 8 | Andriy Khloptsov | Ukraine | + 0.55″ |
| 9 |  Konrad Czerniak | Poland | + 0.61″ |
| 10 | Piero Codia | Italy | + 0.65″ |
| 11 |  László Cseh | Hungary | + 0.75″ |
| 12 | Mathys Goosen | Netherlands | + 0.76″ |
| 13 | Szebasztián Szabó | Serbia | + 0.78″ |
| 14 |  Yauhen Tsurkin | Belarus | + 0.86″ |
| 15 | Yahor Dodaleu | Belarus | + 0.95″ |
| 16 | Evgeny Sedov | Russia | + 0.96″ |