# 2018 FINA World Swimming Championships (25 m) – Men's 400 metre freestyle

The Men's 400 metre freestyle competition of the 2018 FINA World Swimming Championships (25 m) were held on 11 December 2018.

## Records

Prior to the competition, the existing world and championship records were as follows.
| | Name | Nation | Time | Location | Date |
| World record | Yannick Agnel | France | 3:32.25 | Angers | 15 November 2012 |
| Championship record | Péter Bernek | Hungary | 3:34.32 | Doha | 5 December 2014 |
The following records were established during the competition:
| Date | Event | Name | Nation | Time | Record |
| 11 December | Final | Danas Rapšys | Lithuania | 3:34.01 | CR |

## Results
### Heats

The heats were started at 09:30.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 3 | 4 | Danas Rapšys | Lithuania | 3:36.65 | Q, NR |
| 2 | 4 | 5 | Henrik Christiansen | Norway | 3:38.04 | Q |
| 3 | 4 | 6 | Fernando Scheffer | Brazil | 3:39.10 | Q, SA |
| 4 | 5 | 9 | Zane Grothe | United States | 3:39.73 | Q |
| 5 | 5 | 4 | Aleksandr Krasnykh | Russia | 3:39.86 | Q |
| 5 | 5 | 5 | Martin Malyutin | Russia | 3:39.86 | Q |
| 7 | 5 | 3 | Gabriele Detti | Italy | 3:39.89 | Q |
| 8 | 4 | 2 | Wojciech Wojdak | Poland | 3:40.36 | Q |
| 9 | 4 | 3 | Ji Xinjie | China | 3:40.47 | |
| 10 | 5 | 6 | Matteo Ciampi | Italy | 3:42.27 | |
| 11 | 4 | 7 | Jan Micka | Czech Republic | 3:42.31 | |
| 12 | 5 | 8 | David Aubry | France | 3:42.62 | |
| 13 | 3 | 2 | Marcelo Acosta | El Salvador | 3:42.74 | NR |
| 14 | 4 | 9 | Marwan Elkamash | Egypt | 3:43.26 | NR |
| 15 | 4 | 4 | Péter Bernek | Hungary | 3:43.74 | |
| 16 | 5 | 7 | Velimir Stjepanović | Serbia | 3:44.16 | |
| 17 | 5 | 1 | Miguel Nascimento | Portugal | 3:44.79 | |
| 18 | 4 | 0 | Richard Nagy | Slovakia | 3:45.22 | |
| 19 | 3 | 8 | Ahmed Hafnaoui | Tunisia | 3:45.98 | |
| 20 | 2 | 5 | Wang Hsing-hao | Chinese Taipei | 3:46.05 | NR |
| 21 | 3 | 0 | Yordan Yanchev | Bulgaria | 3:46.13 | |
| 22 | 2 | 4 | Nguyễn Hữu Kim Sơn | Vietnam | 3:46.14 | NR |
| 23 | 5 | 0 | Dániel Dudás | Hungary | 3:46.65 | |
| 24 | 4 | 8 | Fuyu Yoshida | Japan | 3:46.96 | |
| 25 | 3 | 1 | Pit Brandenburger | Luxembourg | 3:46.97 | |
| 26 | 3 | 5 | Alexander Trampitsch | Austria | 3:47.71 | |
| 27 | 4 | 1 | Adam Paulsson | Sweden | 3:47.84 | |
| 28 | 3 | 9 | Igor Mogne | Mozambique | 3:48.76 | NR |
| 29 | 5 | 2 | Qiu Ziao | China | 3:50.58 | |
| 30 | 2 | 3 | Irakli Revishvili | Georgia | 3:51.86 | |
| 31 | 3 | 3 | Oli Mortensen | Faroe Islands | 3:53.25 | |
| 32 | 3 | 7 | Siwat Matangkapong | Thailand | 3:55.67 | |
| 33 | 3 | 6 | Matthew Hyde | New Zealand | 3:56.14 | |
| 34 | 1 | 5 | Cristian Santi | San Marino | 4:00.66 | |
| 35 | 2 | 2 | Amadou Ndiaye | Senegal | 4:00.92 | NR |
| 36 | 2 | 1 | Ardi Zulhilmi Mohamed Azman | Singapore | 4:04.28 | |
| 37 | 2 | 7 | Andrej Stojanoski | Macedonia | 4:05.12 | |
| 38 | 1 | 3 | Amir Abbas Amrollahi Biuoki | Iran | 4:05.76 | NR |
| 39 | 2 | 8 | Spiro Goga | Albania | 4:06.92 | |
| 40 | 2 | 6 | Stefano Mitchell | Antigua and Barbuda | 4:06.94 | |
| 41 | 1 | 4 | Vadym Semkiv | Sint Maarten | 4:37.35 | |

### Final

The final was held at 19:00.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 4 | Danas Rapšys | Lithuania | 3:34.01 | CR, NR |
| | 5 | Henrik Christiansen | Norway | 3:36.64 | NR |
| | 1 | Gabriele Detti | Italy | 3:37.54 | |
| 4 | 7 | Martin Malyutin | Russia | 3:37.75 | |
| 5 | 2 | Aleksandr Krasnykh | Russia | 3:37.97 | |
| 6 | 6 | Zane Grothe | United States | 3:38.99 | |
| 7 | 8 | Wojciech Wojdak | Poland | 3:39.22 | |
| 8 | 3 | Fernando Scheffer | Brazil | 3:39.40 | |