# 2018 Pan Pacific Swimming Championships – Men's 100 metre freestyle

The men's 100 metre freestyle competition at the 2018 Pan Pacific Swimming Championships took place on August 10 at the Tokyo Tatsumi International Swimming Center. The defending champion was Cameron McEvoy of Australia.

## Records

Prior to this competition, the existing world and Pan Pacific records were as follows:
| World record | César Cielo (BRA) | 46.91 | Rome, Italy | 30 July 2009 |
| Pan Pacific Championships record | Cameron McEvoy (AUS) | 47.82 | Gold Coast, Australia | 22 August 2014 |

## 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 10 August from 10:00.
Only two swimmers from each country may advance to the A or B final. If a country does 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 | Zachary Apple | United States | 48.05 | QA |
| 2 | Caeleb Dressel | United States | 48.13 | QA |
| 3 | Blake Pieroni | United States | 48.21 | QB |
| 4 | Kyle Chalmers | Australia | 48.23 | QA |
| 5 | Pedro Spajari | Brazil | 48.38 | QA |
| 6 | Jack Cartwright | Australia | 48.43 | QA |
| 7 | Marcelo Chierighini | Brazil | 48.44 | QA |
| 8 | Nathan Adrian | United States | 48.47 | QB |
| 9 | Katsumi Nakamura | Japan | 48.56 | QA |
| 10 | Shinri Shioura | Japan | 48.68 | QA |
| 11 | Townley Haas | United States | 48.69 | |
| 12 | Gabriel Santos | Brazil | 48.72 | QB |
| 13 | Alexander Graham | Australia | 48.75 | QB, WD |
| 14 | James Roberts | Australia | 48.83 | QB, WD |
| 15 | Andrew Seliskar | United States | 48.99 | |
| 15 | Katsuhiro Matsumoto | Japan | 48.99 | QB |
| 17 | Clyde Lewis | Australia | 49.08 | |
| 18 | Yuri Kisil | Canada | 49.16 | QB |
| 19 | Marco Ferreira Júnior | Brazil | 49.23 | QB |
| 20 | Juran Mizohata | Japan | 49.51 | QB |
| 21 | Javier Acevedo | Canada | 49.70 | QB, WD |
| 22 | Daniel Hunter | New Zealand | 49.86 | QB |
| 23 | Ruslan Gaziev | Canada | 49.87 | |
| 24 | Reo Sakata | Japan | 49.91 | |
| 25 | Will Pisani | Canada | 50.05 | |
| 26 | Owen Daly | Canada | 50.11 | |
| 27 | Yuki Kobori | Japan | 50.12 | |
| 28 | Ippei Watanabe | Japan | 50.18 | |
| 29 | Elijah Winnington | Australia | 50.44 | |
| 30 | Grant Irvine | Australia | 50.56 | |
| 31 | Liu Shaofeng | China | 50.69 | |
| 32 | Rafael Barreto | Philippines | 53.10 | |
| 33 | Samir Al-Adawi | Oman | 53.25 | |
| 34 | Noel Keane | Palau | 55.94 | NR |
| 35 | Armand Chan | Philippines | 56.05 | |
| 36 | Lennosuke Suzuki | Northern Mariana Islands | 57.73 | |
| 37 | Mark Imazu | Guam | 1:00.30 | |
| – | Federico Grabich | Argentina | DNS | |

### B Final

The B final was held on 10 August from 18:00.
| Rank | Name | Nationality | Time |
| 9 | Blake Pieroni | United States | 48.21 |
| 10 | Nathan Adrian | United States | 48.32 |
| 11 | Yuri Kisil | Canada | 49.00 |
| 12 | Gabriel Santos | Brazil | 49.24 |
| 13 | Juran Mizohata | Japan | 49.41 |
| 14 | Katsuhiro Matsumoto | Japan | 49.51 |
| 15 | Marco Ferreira Júnior | Brazil | 49.60 |
| 16 | Daniel Hunter | New Zealand | 49.89 |

### A Final

The A final was held on 10 August from 18:00.
| Rank | Name | Nationality | Time |
| | Kyle Chalmers | Australia | 48.00 |
| | Jack Cartwright | Australia | 48.22 |
| | Caeleb Dressel | United States | 48.22 |
| 4 | Marcelo Chierighini | Brazil | 48.36 |
| 5 | Zachary Apple | United States | 48.47 |
| 6 | Katsumi Nakamura | Japan | 48.49 |
| 7 | Pedro Spajari | Brazil | 48.51 |
| 8 | Shinri Shioura | Japan | 48.68 |