2018 Pan Pacific Swimming Championships – Men's 4 × 100 metre medley relay
The men's 4 × 100 metre medley relay competition at the 2018 Pan Pacific Swimming Championships took place on August 12 at the Tokyo Tatsumi International Swimming Center. The defending champion was the United States.
Records
Prior to this competition, the existing world and Pan Pacific records were as follows:| World record | Aaron Peirsol Eric Shanteau Michael Phelps David Walters | 3:27.28 | Rome, Italy | 2 August 2009 |
| Pan Pacific Championships record | Matt Grevers Kevin Cordes Michael Phelps Nathan Adrian | 3:29.94 | Gold Coast, Australia | 24 August 2014 |
Results
All times are in minutes and seconds.| KEY: | CR | Championships record | NR | National record | PB | Personal best | SB | Seasonal best |
Final
The final was held on 12 August from 18:00.| Rank | Lane | Nation | Swimmers | Time | Notes |
| 4 | Ryan Murphy Andrew Wilson Caeleb Dressel Nathan Adrian | 3:30.20 | |||
| 5 | Ryosuke Irie Yasuhiro Koseki Yuki Kobori Katsumi Nakamura | 3:30.25 | |||
| 3 | Mitch Larkin Jake Packard Grant Irvine Kyle Chalmers | 3:30.52 | |||
| 4 | 6 | Gabriel Fantoni João Gomes Júnior Vinicius Lanza Pedro Spajari | 3:32.16 | ||
| 5 | 2 | Javier Acevedo Richard Funk Josiah Binnema Yuri Kisil | 3:34.20 | ||
| 6 | 7 | Armand Chan Timothy Yen Jarod Hatch Rafael Barreto | 3:58.76 |