2018 Pan Pacific Swimming Championships – Men's 400 metre freestyle
# 2018 Pan Pacific Swimming Championships – Men's 400 metre freestyle

The men's 400 metre freestyle competition at the 2018 Pan Pacific Swimming Championships took place on August 11 at the Tokyo Tatsumi International Swimming Center. The defending champion was Park Tae-hwan of South Korea.

## Records

Prior to this competition, the existing world and Pan Pacific records were as follows:

| World record | Paul Biedermann (GER) | 3:40.07 | Rome, Italy | 26 July 2009 |
| - | - | - | - | - |
| Pan Pacific Championships record | Ian Thorpe (AUS) | 3:41.83 | Sydney, Australia | 22 August 1999 |

## Results

All times are in minutes and seconds.

| KEY: | QA | Qualified A Final | QB | Qualified B Final | CR | Championships record | NR | National record | PB | Personal best | SB | Seasonal best |
| - | - | - | - | - | - | - | - | - | - | - | - | - |

### Heats

The first round was held on 11 August from 10:00.

Only two swimmers from each country may advance to the A or B final. If a country not qualify any swimmer to the A final, that same country may qualify up to three swimmers to the B final.

| Rank | Name | Nationality | Time | Notes |
| - | - | - | - | - |
| 1 | Zane Grothe | United States | 3:45.32 | QA |
| 2 | Jack McLoughlin | Australia | 3:45.41 | QA |
| 3 | Mack Horton | Australia | 3:47.75 | QA |
| 4 | Grant Shoults | United States | 3:48.23 | QA |
| 5 | Conor Dwyer | United States | 3:48.60 | QB |
| 6 | Elijah Winnington | Australia | 3:49.27 | QB |
| 7 | Naito Ehara | Japan | 3:50.17 | QA |
| 8 | Robert Finke | United States | 3:51.23 | QB, WD |
| 9 | Fernando Scheffer | Brazil | 3:51.78 | QA |
| 10 | Sean Grieshop | United States | 3:52.04 | QB |
| 11 | Shogo Takeda | Japan | 3:52.23 | QA |
| 12 | Tonwley Haas | United States | 3:53.36 | |
| 13 | Wesley Roberts | Cook Islands | 3:54.08 | QA |
| 14 | Kohei Yamamoto | Japan | 3:54.84 | QB |
| 15 | Tristan Cote | Canada | 3:54.94 | QB |
| 16 | Ayatsugu Hirai | Japan | 3:55.38 | QB |
| 17 | Alex Pratt | Canada | 3:55.66 | QB |
| 18 | Peter Brothers | Canada | 3:55.80 | QB |
| 19 | Luiz Altamir Melo | Brazil | 3:55.85 | |
| 20 | Noel Keane | Palau | 4:28.21 | |
| 21 | Mark Imazu | Guam | 4:48.01 | |
| – | Jeremy Bagshaw | Canada | DNS | |

### B Final

The B final was held on 11 August from 18:00.

| Rank | Name | Nationality | Time |
| - | - | - | - |
| 9 | Conor Dwyer | United States | 3:48.45 |
| 10 | Elijah Winnington | Australia | 3:48.83 |
| 11 | Sean Grieshop | United States | 3:51.52 |
| 12 | Alex Pratt | Canada | 3:51.84 |
| 13 | Kohei Yamamoto | Japan | 3:52.37 |
| 14 | Peter Brothers | Canada | 3:54.08 |
| 15 | Tristan Cote | Canada | 3:54.80 |
| 16 | Ayatsugu Hirai | Japan | 3:56.05 |

### A Final

The A final was held on 11 August from 18:00.

| Rank | Name | Nationality | Time |
| - | - | - | - |
| | Jack McLoughlin | Australia | 3:44.20 |
| | Mack Horton | Australia | 3:44.31 |
| | Zane Grothe | United States | 3:45.37 |
| 4 | Grant Shoults | United States | 3:48.27 |
| 5 | Naito Ehara | Japan | 3:48.80 |
| 6 | Fernando Scheffer | Brazil | 3:50.55 |
| 7 | Wesley Roberts | Cook Islands | 3:54.73 |
| 8 | Shogo Takeda | Japan | 3:55.30 |
