Heats
samedi 11 août 2018, 03h00 GMT – 03h00 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Chase Kalisz | United States | 1′ 57.07″ |
| 2 |  Kosuke Hagino | Japan | + 0.53″ |
| 3 |  Abrahm Devine | United States | + 1.38″ |
| 4 | Clyde Lewis | Australia | + 1.4″ |
| 5 | Daiya Seto | Japan | + 1.43″ |
| 6 | Hiromasa Fujimori | Japan | + 1.71″ |
| 7 |  Mitch Larkin | Australia | + 2.41″ |
| 8 | Jay Litherland | United States | + 2.84″ |
| 9 | Leonardo Santos | Brazil | + 3.18″ |
| 10 |  Lewis Clareburt | New Zealand | + 3.85″ |
| 11 | Brandonn Almeida | Brazil | + 4.13″ |
| 12 | Juran Mizohata | Japan | + 4.5″ |
| 13 | Mack Darragh | Canada | + 4.65″ |
| 14 |  Javier Acevedo | Canada | + 4.72″ |
| 15 | Ziqi Deng | China | + 5.44″ |
| 16 | Jonathan Gómez | Colombia | + 10.35″ |
| 17 | Lennosuke Suzuki | Northern Mariana Islands | + 30″ |
| Jarod Hatch | Philippines | DQ | |
| Caeleb Dressel | United States | DQ | |
| Andrew Seliskar | United States | ||
 Vinicius Lanza | Brazil | DQ |