Heats
dimanche 12 août 2018, 03h00 GMT – 03h00 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Ryan Murphy | United States | 1′ 54.07″ |
| 2 |  Austin Katz | United States | + 1.62″ |
| 3 | Jacob Pebley | United States | + 1.88″ |
| 4 |  Ryosuke Irie | Japan | + 2.76″ |
| 5 | Keita Sunama | Japan | + 3.11″ |
| 6 |  Mitch Larkin | Australia | + 4.08″ |
| 7 | Bradley Woodward | Australia | + 4.17″ |
| 8 |  Javier Acevedo | Canada | + 4.67″ |
| 9 |  Leonardo de Deus | Brazil | + 5.52″ |
| 10 | Yutian Wang | China | + 5.83″ |
| 11 | Markus Thormeyer | Canada | + 5.97″ |
| 12 | Masaki Kaneko | Japan | + 6.17″ |
| 13 | Jay Litherland | United States | + 6.19″ |
| 14 | Gabriel Fantoni | Brazil | + 6.94″ |
| 15 | Brandonn Almeida | Brazil | + 7.67″ |
| 16 |  Lewis Clareburt | New Zealand | + 8.06″ |
| 17 | Leonardo Santos | Brazil | + 9.28″ |
| 18 | Josiah Binnema | Canada | + 12.38″ |
| 19 | Armand Pierre Chan | Philippines | + 24.32″ |
| Clyde Lewis | Australia | DNS |