| Date | 15 August 2010 | 
|---|---|
| Status | YOG | 
| Location | Singapore Sports School, Singapore | 
| Participants | 70 from 17 countries | 
Top 8 times advanced to final.
| Pos | Lane | Swimmer | NOC | Time | Exchange (Pos) | ||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | – | People's Republic of China |  CHN | 3:39.39 | |||||
| Bai Anqi | – | – (–) | |||||||
| He Jianbin | – | – (–) | |||||||
| Liu Lan | – | – (–) | |||||||
| Sun Bowei | – | – (–) | |||||||
| 2 | – | Hong Kong, China |  HKG | 3:40.34 | |||||
| Kent Cheung | – | – (–) | |||||||
| Yvette Kong | – | – (–) | |||||||
| Jeffrey Lum | – | – (–) | |||||||
| Yu Wai Ting | – | – (–) | |||||||
| 3 | – | Serbia |  SRB | 3:41.15 | |||||
| Marija Joksimović | – | – (–) | |||||||
| Katarina Simonović | – | – (–) | |||||||
| Stefan Šorak | – | – (–) | |||||||
| Velimir Stjepanović | – | – (–) | |||||||
| 4 | – | Italy |  ITA | 3:42.44 | |||||
| Elena Di Liddo | – | – (–) | |||||||
| Alessia Polieri | – | – (–) | |||||||
| Tommaso Romani | – | – (–) | |||||||
| Alessio Torlai | – | – (–) | |||||||
| – | Spain |  ESP | – | ||||||
| Judit Ignacio | – | – (–) | |||||||
| Yeray Lebon | – | – (–) | |||||||
| Anna Martí | – | – (–) | |||||||
| Eduardo Solaeche | – | – (–) | 
| Pos | Lane | Swimmer | NOC | Time | Exchange (Pos) | ||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | – | Canada |  CAN | 3:36.80 | |||||
| Jeremy Bagshaw | – | – (–) | |||||||
| Chad Bobrosky | – | – (–) | |||||||
| Lindsay Delmar | – | – (–) | |||||||
| Lauren Earp | – | – (–) | |||||||
| 2 | – | France |  FRA | 3:37.03 | |||||
| Mathilde Cini | – | – (–) | |||||||
| Jordan Coelho | – | – (–) | |||||||
| Mehdy Metella | – | – (–) | |||||||
| Anna Santamans | – | – (–) | |||||||
| 3 | – | United States |  USA | 3:38.89 | |||||
| Kiera Janzen | – | – (–) | |||||||
| Jordan Mattern | – | – (–) | |||||||
| Erich Peske | – | – (–) | |||||||
| Thomas Stephens | – | – (–) | |||||||
| 4 | – | Russian Federation |  RUS | 3:39.69 | |||||
| Yekaterina Andreyeva | – | – (–) | |||||||
| Aleksey Atsapkin | – | – (–) | |||||||
| Kristina Kochetkova | – | – (–) | |||||||
| Andrey Ushakov | – | – (–) | |||||||
| 5 | – | South Africa |  RSA | 3:43.85 | |||||
| Natasha de Vos | – | – (–) | |||||||
| Kyla Ferreira | – | – (–) | |||||||
| Pierre Keune | – | – (–) | |||||||
| Murray McDougall | – | – (–) | |||||||
| 6 | – | Iceland |  ISL | 3:49.60 | |||||
| Ingibjörg Jónsdóttir | – | – (–) | |||||||
| Anton McKee | – | – (–) | |||||||
| Hrafn Traustason | – | – (–) | |||||||
| Karen Vilhjálmsdóttir | – | – (–) | 
| Pos | Lane | Swimmer | NOC | Time | Exchange (Pos) | ||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | – | Australia |  AUS | 3:34.67 | |||||
| Justin James | – | – (–) | |||||||
| Emma McKeon | – | – (–) | |||||||
| Kenneth To | – | – (–) | |||||||
| Madi Wilson | – | – (–) | |||||||
| 2 | – | Germany |  GER | 3:38.69 | |||||
| Melvin Herrmann | – | – (–) | |||||||
| Lena Kalla | – | – (–) | |||||||
| Kevin Leithold | – | – (–) | |||||||
| Juliane Reinhold | – | – (–) | |||||||
| 3 | – | Brazil |  BRA | 3:41.07 | |||||
| Carolina Bergamaschi | – | – (–) | |||||||
| Pedro de Souza | – | – (–) | |||||||
| Alessandra Marchioro | – | – (–) | |||||||
| Victor Rodrigues | – | – (–) | |||||||
| 4 | – | Singapore |  SGP | 3:42.88 | |||||
| Amanda Lim | – | – (–) | |||||||
| Clement Lim | – | – (–) | |||||||
| Arren Quek | – | – (–) | |||||||
| Adeline Winata | – | – (–) | |||||||
| 5 | – | Japan |  JPN | 3:49.23 | |||||
| Maya Hamano | – | – (–) | |||||||
| Jun Isaji | – | – (–) | |||||||
| Mina Ochi | – | – (–) | |||||||
| Yusuke Yamagishi | – | – (–) | |||||||
| 6 | – | Trinidad and Tobago |  TTO | 3:51.35 | |||||
| Christian Homer | – | – (–) | |||||||
| Kimberlee John-Williams | – | – (–) | |||||||
| Cadell Lyons | – | – (–) | |||||||
| Khadeja Phillip | – | – (–) | 
| Pos | Lane | Swimmer | NOC | Time | Exchange (Pos) | ||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | – | People's Republic of China |  CHN | 3:31.34 | |||||
| He Jianbin | – | – (–) | |||||||
| Liu Lan | – | – (–) | |||||||
| Sun Bowei | – | – (–) | |||||||
| Tang Yi | – | – (–) | |||||||
| 2 | – | Australia |  AUS | 3:31.69 | |||||
| Justin James | – | – (–) | |||||||
| Emma McKeon | – | – (–) | |||||||
| Kenneth To | – | – (–) | |||||||
| Madi Wilson | – | – (–) | |||||||
| 3 | – | France |  FRA | 3:35.90 | |||||
| Mathilde Cini | – | – (–) | |||||||
| Jordan Coelho | – | – (–) | |||||||
| Mehdy Metella | – | – (–) | |||||||
| Anna Santamans | – | – (–) | |||||||
| 4 | – | Canada |  CAN | 3:36.05 | |||||
| Jeremy Bagshaw | – | – (–) | |||||||
| Chad Bobrosky | – | – (–) | |||||||
| Lindsay Delmar | – | – (–) | |||||||
| Lauren Earp | – | – (–) | |||||||
| 5 | – | Germany |  GER | 3:36.06 | |||||
| Melvin Herrmann | – | – (–) | |||||||
| Kevin Leithold | – | – (–) | |||||||
| Lina Rathsack | – | – (–) | |||||||
| Juliane Reinhold | – | – (–) | |||||||
| 6 | – | United States |  USA | 3:39.08 | |||||
| Kiera Janzen | – | – (–) | |||||||
| Jordan Mattern | – | – (–) | |||||||
| Erich Peske | – | – (–) | |||||||
| Thomas Stephens | – | – (–) | |||||||
| 7 | – | Hong Kong, China |  HKG | 3:40.08 | |||||
| Kent Cheung | – | – (–) | |||||||
| Yvette Kong | – | – (–) | |||||||
| Jeffrey Lum | – | – (–) | |||||||
| Yu Wai Ting | – | – (–) | |||||||
| 8 | – | Russian Federation |  RUS | 3:42.63 | |||||
| Yekaterina Andreyeva | – | – (–) | |||||||
| Aleksey Atsapkin | – | – (–) | |||||||
| Kristina Kochetkova | – | – (–) | |||||||
| Andrey Ushakov | – | – (–) |