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 | 46.91 | Rome, Italy | 30 July 2009 | |
| Pan Pacific Championships record | 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 | 48.05 | QA | |
| 2 | Caeleb Dressel | 48.13 | QA | |
| 3 | Blake Pieroni | 48.21 | QB | |
| 4 | Kyle Chalmers | 48.23 | QA | |
| 5 | Pedro Spajari | 48.38 | QA | |
| 6 | Jack Cartwright | 48.43 | QA | |
| 7 | Marcelo Chierighini | 48.44 | QA | |
| 8 | Nathan Adrian | 48.47 | QB | |
| 9 | Katsumi Nakamura | 48.56 | QA | |
| 10 | Shinri Shioura | 48.68 | QA | |
| 11 | Townley Haas | 48.69 | ||
| 12 | Gabriel Santos | 48.72 | QB | |
| 13 | Alexander Graham | 48.75 | ||
| 14 | James Roberts | 48.83 | ||
| 15 | Andrew Seliskar | 48.99 | ||
| 15 | Katsuhiro Matsumoto | 48.99 | QB | |
| 17 | Clyde Lewis | 49.08 | ||
| 18 | Yuri Kisil | 49.16 | QB | |
| 19 | Marco Ferreira Júnior | 49.23 | QB | |
| 20 | Juran Mizohata | 49.51 | QB | |
| 21 | Javier Acevedo | 49.70 | ||
| 22 | Daniel Hunter | 49.86 | QB | |
| 23 | Ruslan Gaziev | 49.87 | ||
| 24 | Reo Sakata | 49.91 | ||
| 25 | Will Pisani | 50.05 | ||
| 26 | Owen Daly | 50.11 | ||
| 27 | Yuki Kobori | 50.12 | ||
| 28 | Ippei Watanabe | 50.18 | ||
| 29 | Elijah Winnington | 50.44 | ||
| 30 | Grant Irvine | 50.56 | ||
| 31 | Liu Shaofeng | 50.69 | ||
| 32 | Rafael Barreto | 53.10 | ||
| 33 | Samir Al-Adawi | 53.25 | ||
| 34 | Noel Keane | 55.94 | NR | |
| 35 | Armand Chan | 56.05 | ||
| 36 | Lennosuke Suzuki | 57.73 | ||
| 37 | Mark Imazu | 1:00.30 | ||
| Federico Grabich |
B Final
The B final was held on 10 August from 18:00.| Rank | Name | Nationality | Time | Notes |
| 9 | Blake Pieroni | 48.21 | ||
| 10 | Nathan Adrian | 48.32 | ||
| 11 | Yuri Kisil | 49.00 | ||
| 12 | Gabriel Santos | 49.24 | ||
| 13 | Juran Mizohata | 49.41 | ||
| 14 | Katsuhiro Matsumoto | 49.51 | ||
| 15 | Marco Ferreira Júnior | 49.60 | ||
| 16 | Daniel Hunter | 49.89 |
A Final
The A final was held on 10 August from 18:00.| Rank | Name | Nationality | Time | Notes |
| Kyle Chalmers | 48.00 | |||
| Jack Cartwright | 48.22 | |||
| Caeleb Dressel | 48.22 | |||
| 4 | Marcelo Chierighini | 48.36 | ||
| 5 | Zachary Apple | 48.47 | ||
| 6 | Katsumi Nakamura | 48.49 | ||
| 7 | Pedro Spajari | 48.51 | ||
| 8 | Shinri Shioura | 48.68 |