# 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 (25 m) 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 (49.63) Sergey Geybel (56.43) Yevgeny Korotyshkin (48.35) Danila Izotov (44.75) | Russia | 3:19.16 | Saint Petersburg | 20 December 2009 |
| Championship record | Nick Thoman (49.88) Mihail Alexandrov (56.52) Ryan Lochte (49.17) Garrett Weber-Gale (45.42) | United States | 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 (49.63) Andrew Wilson (56.84) Caeleb Dressel (48.28) Ryan Held (45.23) | United States | 3:19.98 | CR |

## Results
### Heats

The heats were started at 10:09.
| Rank | Heat | Lane | Nation | Swimmers | Time | Notes |
| 1 | 2 | 6 | United States | Matt Grevers (49.97) Michael Andrew (57.70) Jack Conger (49.45) Blake Pieroni (46.10) | 3:23.22 | Q |
| 2 | 2 | 7 | Brazil | Guilherme Guido (50.12) Diego Prado (57.11) Nicholas Santos (50.32) Breno Correia (46.31) | 3:23.86 | Q |
| 3 | 1 | 7 | Germany | Ramon Klenz (52.69) Marco Koch (56.56) Marius Kusch (48.67) Damian Wierling (46.80) | 3:24.72 | Q |
| 4 | 1 | 1 | Belarus | Viktar Staselovich (51.55) Ilya Shymanovich (56.12) Yauhen Tsurkin(50.15) Artsiom Machekin (47.27) | 3:25.09 | Q |
| 5 | 1 | 5 | Russia | Andrey Shabasov (51.15) Oleg Kostin (57.58) Aleksandr Kharlanov (50.36) Vladislav Grinev (46.08) | 3:25.17 | Q |
| 6 | 1 | 6 | Lithuania | Danas Rapšys (51.64) Andrius Šidlauskas (57.25) Deividas Margevičius (50.59) Simonas Bilis (45.83) | 3:25.31 | Q |
| 7 | 1 | 3 | Japan | Yuma Edo (51.35) Yasuhiro Koseki (57.31) Takeshi Kawamoto (50.04) Katsumi Nakamura (46.64) | 3:25.34 | Q |
| 8 | 1 | 4 | Australia | Mitch Larkin (50.64) Grayson Bell (58.34) Nic Brown (50.55) Cameron McEvoy (46.21) | 3:25.74 | Q |
| 9 | 2 | 2 | Italy | Simone Sabbioni (51.61) Nicolò Martinenghi (57.23) Matteo Rivolta (49.89) Alessandro Miressi (47.38) | 3:26.11 | R |
| 10 | 2 | 4 | Ireland | Conor Ferguson (52.18) Darragh Greene (57.82) Brendan Hyland (51.38) Shane Ryan (45.85) | 3:27.23 | R |
| 11 | 2 | 0 | Austria | Bernhard Reitshammer (52.87) Christopher Rothbauer (59.31) Sascha Subarsky (52.52) Heiko Gigler (47.23) | 3:31.93 | |
| 12 | 1 | 8 | New Zealand | Bradlee Ashby (52.18) George Schroder (1:01.08) Wilrich Coetzee (52.01) Daniel Hunter (47.40) | 3:32.67 | |
| 13 | 2 | 8 | Switzerland | Thierry Bollin (53.45) Yannick Käser (58.02) Nils Liess (52.28) Manuel Leuthard (49.35) | 3:33.10 | |
| 14 | 1 | 2 | Chinese Taipei | Chuang Mu-lun (54.06) Cai Bing-rong (59.55) Wang Kuan-hung (53.30) Lin Chien-liang (49.12) | 3:36.03 | |
| 15 | 2 | 1 | Slovakia | Ádám Halás (54.72) Tomáš Klobučník (58.65) Richard Nagy (54.27) Marek Botík (52.37) | 3:40.01 | |
| | 2 | 3 | Turkey | İskender Başlakov (52.26) Hüseyin Emre Sakçı (58.57) Umitcan Gures Kemal Arda Gürdal | DSQ | |
| | 2 | 5 | China | Li Guangyuan (51.79) Wang Lizhuo (56.98) Li Zhuhao Cao Jiwen | DSQ | |

### Final

The final was held at 19:45.
| Rank | Lane | Nation | Swimmers | Time | Notes |
| | 4 | United States | Ryan Murphy (49.63) Andrew Wilson (56.84) Caeleb Dressel (48.28) Ryan Held (45.23) | 3:19.98 | CR, AM |
| | 2 | Russia | Kliment Kolesnikov (49.62) Kirill Prigoda (55.98) Mikhail Vekovishchev (50.00) Vladimir Morozov (45.01) | 3:20.61 | |
| | 1 | Japan | Ryosuke Irie (49.95) Yasuhiro Koseki (55.91) Takeshi Kawamoto (49.58) Katsumi Nakamura (45.63) | 3:21.07 | AS |
| 4 | 5 | Brazil | Guilherme Guido (49.89) Felipe Lima (56.39) Nicholas Santos (49.42) Breno Correia (46.30) | 3:22.00 | |
| 5 | 3 | Germany | Christian Diener (50.01) Marco Koch (56.68) Marius Kusch (48.91) Damian Wierling (46.57) | 3:22.17 | |
| 6 | 6 | Belarus | Viktar Staselovich (51.94) Ilya Shymanovich (55.60) Yauhen Tsurkin(49.59) Artsiom Machekin (47.28) | 3:24.41 | |
| 7 | 7 | Lithuania | Danas Rapšys (51.44) Andrius Šidlauskas (57.14) Deividas Margevičius (50.01) Simonas Bilis (45.92) | 3:24.51 | |
| 8 | 8 | Australia | Mitch Larkin (49.47) Grayson Bell (58.20) Nic Brown (50.53) Cameron McEvoy (46.45) | 3:24.65 | |