# 2010 Pan Pacific Swimming Championships – Men's 400 metre individual medley

The men's 400 metre individual medley competition at the 2010 Pan Pacific Swimming Championships took place on August 19 at the William Woollett Jr. Aquatics Center. The last champion was Michael Phelps of US.
This race consisted of eight lengths of the pool. The first two lengths were swum using the butterfly stroke, the second pair with the backstroke, the third pair of lengths in breaststroke, and the final two were freestyle.

## Records

Prior to this competition, the existing world and Pan Pacific records were as follows:
| World record | Michael Phelps (USA) | 4:03.84 | Beijing, China | August 10, 2008 |
| Pan Pacific Championships record | Michael Phelps (USA) | 4:10.47 | Victoria, Canada | August 18, 2006 |

## Results

All times are in minutes and seconds.
| KEY: | q | Fastest non-qualifiers | Q | Qualified | CR | Championships record | NR | National record | PB | Personal best | SB | Seasonal best |

### Heats

The first round was held on August 19, at 11:14. As only two members of each nation can enter Final A, Michael Phelps, despite finishing with the fourth fastest time, was the third fastest American, therefore could not compete in Final A. He did not participate in Final B either.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 1 | 4 | Ryan Lochte | United States | 4:08.77 | QA, CR |
| 2 | 1 | 5 | Tyler Clary | United States | 4:09.20 | QA |
| 3 | 2 | 4 | Thiago Pereira | Brazil | 4:15.35 | QA |
| 4 | 3 | 4 | Michael Phelps | United States | 4:15.38 | QB 3rd American |
| 5 | 2 | 5 | Yuya Horihata | Japan | 4:16.44 | QA |
| 6 | 2 | 3 | Brian Johns | Canada | 4:16.50 | QA |
| 7 | 1 | 3 | Robert Margalis | United States | 4:17.16 | QB 4th American |
| 8 | 3 | 2 | Ken Takakuwa | Japan | 4:17.40 | QA |
| 9 | 1 | 6 | Andrew Gemmell | United States | 4:17.75 | QB 5th American |
| 10 | 3 | 6 | Kosuke Hagino | Japan | 4:19.02 | QB 3rd Japanese |
| 11 | 3 | 1 | Andrew Ford | Canada | 4:21.22 | QA |
| 12 | 2 | 2 | Jordan Hartney | Canada | 4:21.31 | QB 3rd Canadian |
| 13 | 1 | 2 | Jayden Hadler | Australia | 4:23.25 | QA |
| 14 | 1 | 7 | Taki Mrabet | Tunisia | 4:26.10 | QB |
| 15 | 3 | 7 | Diogo Yabe | Brazil | 4:27.22 | QB |
| 16 | 2 | 7 | Sebastian Rousseau | South Africa | 4:29.07 | QB |
| 17 | 3 | 3 | Kim Mingyu | South Korea | 4:29.27 | |
| 18 | 2 | 1 | Esteban Enderica | Ecuador | 4:31.20 | QB |
| - | 3 | 5 | Oussama Mellouli | Tunisia | DNS | |
| - | 2 | 6 | Thomas Fraser-Holmes | Australia | DSQ | |

### B Final

The B final was held on August 19, at 19:18.
| Rank | Lane | Name | Nationality | Time |
| 9 | 4 | Robert Margalis | United States | 4:17.28 |
| 10 | 3 | Jordan Hartney | Canada | 4:19.04 |
| 11 | 8 | Andrew Gemmell | United States | 4:19.69 |
| 12 | 5 | Kosuke Hagino | Japan | 4:21.95 |
| 13 | 6 | Taki Mrabet | Tunisia | 4:24.47 |
| 14 | 7 | Kim Mingyu | South Korea | 4:26.00 |
| 15 | 2 | Diogo Yabe | Brazil | 4:28.47 |
| 16 | 1 | Esteban Enderica | Ecuador | 4:32.28 |

### A Final

The A final was held on August 19, at 19:18.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 4 | Ryan Lochte | United States | 4:07.59 | CR |
| | 5 | Tyler Clary | United States | 4:09.55 | |
| | 3 | Thiago Pereira | Brazil | 4:12.09 | |
| 4 | 6 | Yuya Horihata | Japan | 4:15.93 | |
| 5 | 2 | Brian Johns | Canada | 4:16.21 | |
| 6 | 7 | Ken Takakuwa | Japan | 4:17.47 | |
| 7 | 1 | Andrew Ford | Canada | 4:21.66 | |
| 8 | 8 | Jayden Hadler | Australia | 4:23.72 | |