Heats
jeudi 9 août 2018, 03h00 GMT – 11h00 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Jordan Wilimovsky | United States | 14′ 46.93″ |
| 2 |  Zane Grothe | United States | + 1.47″ |
| 3 | Robert Finke | United States | + 1.77″ |
| 4 |  Jack McLoughlin | Australia | + 8.99″ |
| 5 |  Guilherme Costa | Brazil | + 16.47″ |
| 6 | Shogo Takeda | Japan | + 18.88″ |
| 7 | James Brinegar | United States | + 20.11″ |
| 8 | Eric Hedlin | Canada | + 20.25″ |
| 9 | Kohei Yamamoto | Japan | + 31.78″ |
| 10 | David Heron | United States | + 36.05″ |
| 11 | Ayatsugu Hirai | Japan | + 36.5″ |
| 12 | Taylor Abbott | United States | + 46.71″ |
| 13 | Peter Brothers | Canada | + 54.7″ |
| 14 | Noel Keane | Palau | + 3′ 12.37″ |
| 15 | Tommy Imazu | Guam | + 4′ 48.67″ |