| Date | 9 October 2018 — 19:30 | |
|---|---|---|
| Status | YOG | |
| Location | Natatorium, Parque Olímpico de la Juventud, Villa Soldati, Buenos Aires | |
| Participants | 32 from 8 countries | |
| Format | Final round only. | |
| Pos | Competitors | NOC | Time | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | Russian Federation |  RUS | 3:18.11 | Gold | |||||
| Kliment Kolesnikov • Daniil Markov • Vladislav Gerasimenko • Andrey Minakov | |||||||||
| 2 | Brazil |  BRA | 3:20.99 | Silver | |||||
| Murilo Sartori • Lucas Costa Peixoto • André de Souza • Vitor de Souza | |||||||||
| 3 | Italy |  ITA | 3:22.01 | Bronze | |||||
| Federico Burdisso • Thomas Ceccon • Marco De Tullio • Johannes Calloni | |||||||||
| 4 | People's Republic of China |  CHN | 3:24.03 | ||||||
| Wang Guanbin • Shen Jiahao • Sun Jiajun • Hong Jinquan | |||||||||
| 5 | Australia |  AUS | 3:24.69 | ||||||
| Ashton Brinkworth • Lewis Blackburn • Joseph Jackson • Stuart Swinburn | |||||||||
| 6 | Japan |  JPN | 3:26.80 | ||||||
| Keisuke Yoshida • Taku Taniguchi • Shinnosuke Ishikawa • Yu Hanaguruma | |||||||||
| 7 | United States |  USA | 3:30.35 | ||||||
| Will Barao • Ethan Dang • Jake Johnson • Ethan Harder | |||||||||
| 8 | South Africa |  RSA | 3:31.19 | ||||||
| Ethan du Preez • Hendrik Duvenhage • Gabriel Nortje • Michael Houlie | |||||||||
