| | Event type
4 × 100 metres Freestyle Relay, Boys
| 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 | Lane | Swimmer | NOC | Time | Exchange (Pos) | |||
|---|---|---|---|---|---|---|---|---|
| 1 | – | Russian Federation |  RUS | 3:18.11 | Gold | |||
| Kliment Kolesnikov | 48.04 | – (–) | ||||||
| Daniil Markov | 49.58 | – (–) | ||||||
| Vladislav Gerasimenko | 51.56 | – (–) | ||||||
| Andrey Minakov | 48.93 | – (–) | ||||||
| 2 | – | Brazil |  BRA | 3:20.99 | Silver | |||
| Murilo Sartori | 50.55 | – (–) | ||||||
| Lucas Costa Peixoto | 49.70 | – (–) | ||||||
| André de Souza | 48.87 | – (–) | ||||||
| Vitor de Souza | 51.87 | – (–) | ||||||
| 3 | – | Italy |  ITA | 3:22.01 | Bronze | |||
| Federico Burdisso | 50.06 | – (–) | ||||||
| Thomas Ceccon | 49.33 | – (–) | ||||||
| Marco De Tullio | 50.84 | – (–) | ||||||
| Johannes Calloni | 51.78 | – (–) | ||||||
| 4 | – | People's Republic of China |  CHN | 3:24.03 | ||||
| Wang Guanbin | 51.40 | – (–) | ||||||
| Shen Jiahao | 50.52 | – (–) | ||||||
| Sun Jiajun | 51.71 | – (–) | ||||||
| Hong Jinquan | 50.40 | – (–) | ||||||
| 5 | – | Australia |  AUS | 3:24.69 | ||||
| Ashton Brinkworth | 50.79 | – (–) | ||||||
| Lewis Blackburn | 51.69 | – (–) | ||||||
| Joseph Jackson | 50.89 | – (–) | ||||||
| Stuart Swinburn | 51.32 | – (–) | ||||||
| 6 | – | Japan |  JPN | 3:26.80 | ||||
| Keisuke Yoshida | 52.14 | – (–) | ||||||
| Taku Taniguchi | 51.15 | – (–) | ||||||
| Shinnosuke Ishikawa | 52.22 | – (–) | ||||||
| Yu Hanaguruma | 51.29 | – (–) | ||||||
| 7 | – | United States |  USA | 3:30.35 | ||||
| Will Barao | 53.14 | – (–) | ||||||
| Ethan Dang | 52.80 | – (–) | ||||||
| Jake Johnson | 52.56 | – (–) | ||||||
| Ethan Harder | 51.85 | – (–) | ||||||
| 8 | – | South Africa |  RSA | 3:31.19 | ||||
| Ethan du Preez | 53.58 | – (–) | ||||||
| Hendrik Duvenhage | 52.80 | – (–) | ||||||
| Gabriel Nortje | 51.02 | – (–) | ||||||
| Michael Houlie | 53.79 | – (–) |