2018 FINA World Swimming Championships (25 m) – Men's 4 × 100 metre medley relay
The men's 4 × 100 metre medley relay competition of the 2018 FINA World Swimming Championships was held on 16 December 2018.
Records
Prior to the competition, the existing world and championship records were as follows.| Name | Nation | Time | Location | Date | |
| World record | Stanislav Donets Sergey Geybel Yevgeny Korotyshkin Danila Izotov | 3:19.16 | Saint Petersburg | 20 December 2009 | |
| Championship record | Nick Thoman Mihail Alexandrov Ryan Lochte Garrett Weber-Gale | 3:20.99 | Dubai, UAE | 19 December 2010 |
The following records were established during the competition:
| Date | Event | Name | Nation | Time | Record |
| 16 December | Final | Ryan Murphy Andrew Wilson Caeleb Dressel Ryan Held | 3:19.98 | CR, AM |
Results
Heats
The heats were started at 10:09.| Rank | Heat | Lane | Nation | Swimmers | Time | Notes |
| 1 | 2 | 6 | Matt Grevers Michael Andrew Jack Conger Blake Pieroni | 3:23.22 | Q | |
| 2 | 2 | 7 | Guilherme Guido Diego Prado Nicholas Santos Breno Correia | 3:23.86 | Q | |
| 3 | 1 | 7 | Ramon Klenz Marco Koch Marius Kusch Damian Wierling | 3:24.72 | Q | |
| 4 | 1 | 1 | Viktar Staselovich Ilya Shymanovich Yauhen Tsurkin Artsiom Machekin | 3:25.09 | Q | |
| 5 | 1 | 5 | Andrey Shabasov Oleg Kostin Aleksandr Kharlanov Vladislav Grinev | 3:25.17 | Q | |
| 6 | 1 | 6 | Danas Rapšys Andrius Šidlauskas Deividas Margevičius Simonas Bilis | 3:25.31 | Q | |
| 7 | 1 | 3 | Yuma Edo Yasuhiro Koseki Takeshi Kawamoto Katsumi Nakamura | 3:25.34 | Q | |
| 8 | 1 | 4 | Mitch Larkin Grayson Bell Nic Brown Cameron McEvoy | 3:25.74 | Q | |
| 9 | 2 | 2 | Simone Sabbioni Nicolò Martinenghi Matteo Rivolta Alessandro Miressi | 3:26.11 | R | |
| 10 | 2 | 4 | Conor Ferguson Darragh Greene Brendan Hyland Shane Ryan | 3:27.23 | R | |
| 11 | 2 | 0 | Bernhard Reitshammer Christopher Rothbauer Sascha Subarsky Heiko Gigler | 3:31.93 | ||
| 12 | 1 | 8 | Bradlee Ashby George Schroder Wilrich Coetzee Daniel Hunter | 3:32.67 | ||
| 13 | 2 | 8 | Thierry Bollin Yannick Käser Nils Liess Manuel Leuthard | 3:33.10 | ||
| 14 | 1 | 2 | Chuang Mu-lun Cai Bing-rong Wang Kuan-hung Lin Chien-liang | 3:36.03 | ||
| 15 | 2 | 1 | Ádám Halás Tomáš Klobučník Richard Nagy Marek Botík | 3:40.01 | ||
| 2 | 3 | İskender Başlakov Hüseyin Emre Sakçı Umitcan Gures Kemal Arda Gürdal | ||||
| 2 | 5 | Li Guangyuan Wang Lizhuo Li Zhuhao Cao Jiwen |
Final
The final was held at 19:45.| Rank | Lane | Nation | Swimmers | Time | Notes |
| 4 | Ryan Murphy Andrew Wilson Caeleb Dressel Ryan Held | 3:19.98 | CR, AM | ||
| 2 | Kliment Kolesnikov Kirill Prigoda Mikhail Vekovishchev Vladimir Morozov | 3:20.61 | |||
| 1 | Ryosuke Irie Yasuhiro Koseki Takeshi Kawamoto Katsumi Nakamura | 3:21.07 | AS | ||
| 4 | 5 | Guilherme Guido Felipe Lima Nicholas Santos Breno Correia | 3:22.00 | ||
| 5 | 3 | Christian Diener Marco Koch Marius Kusch Damian Wierling | 3:22.17 | ||
| 6 | 6 | Viktar Staselovich Ilya Shymanovich Yauhen Tsurkin Artsiom Machekin | 3:24.41 | ||
| 7 | 7 | Danas Rapšys Andrius Šidlauskas Deividas Margevičius Simonas Bilis | 3:24.51 | ||
| 8 | 8 | Mitch Larkin Grayson Bell Nic Brown Cameron McEvoy | 3:24.65 |