# 2018 FINA World Swimming Championships (25 m) – Men's 100 metre individual medley

The men's 100 metre individual medley competition of the 2018 FINA World Swimming Championships (25 m) was held on 13 and 14 December 2018.

## Records

Prior to the competition, the existing world and championship records were as follows.
| | Name | Nation | Time | Location | Date |
| World record | Vladimir Morozov | Russia | 50.26 | Eindhoven | 28 September 2018 |
| Championship record | Markus Deibler | Germany | 50.66 | Doha | 7 December 2014 |
The following new records were set during this competition:
| Date | Event | Name | Nation | Time | Record |
| 14 December | Final | Kliment Kolesnikov | Russia | 50.63 | CR |

## Results
### Heats

The heats were started on 13 December at 9:30.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | 4 | Michael Andrew | United States | 51.50 | Q |
| 2 | 2 | 4 | Kliment Kolesnikov | Russia | 51.69 | Q |
| 3 | 3 | 5 | Marco Orsi | Italy | 51.86 | Q |
| 4 | 4 | 6 | Markus Lie | Norway | 52.12 | Q |
| 5 | 4 | 5 | Wang Shun | China | 52.15 | Q |
| 6 | 2 | 5 | Caio Pumputis | Brazil | 52.31 | Q |
| 7 | 3 | 4 | Sergey Fesikov | Russia | 52.33 | Q |
| 8 | 3 | 3 | Hiromasa Fujimori | Japan | 52.35 | Q |
| 9 | 4 | 3 | Kenneth To | Hong Kong | 52.38 | Q |
| 10 | 3 | 7 | Heiko Gigler | Austria | 52.52 | Q |
| 11 | 4 | 2 | Bernhard Reitshammer | Austria | 52.78 | Q |
| 12 | 2 | 7 | Alexis Santos | Portugal | 53.09 | Q |
| 13 | 3 | 2 | Simon Sjödin | Sweden | 53.31 | Q |
| 14 | 2 | 3 | Diego Prado | Brazil | 53.50 | Q |
| 15 | 2 | 2 | Jack Gerrard | Australia | 53.51 | Q |
| 16 | 4 | 7 | Bradlee Ashby | New Zealand | 53.64 | Q |
| 17 | 4 | 1 | Dávid Földházi | Hungary | 53.67 | |
| 18 | 2 | 1 | Ben Hockin | Paraguay | 53.82 | |
| 19 | 2 | 6 | Emmanuel Vanluchene | Belgium | 53.90 | |
| 20 | 3 | 1 | Diogo Carvalho | Portugal | 53.97 | |
| 21 | 2 | 8 | Ádám Halás | Slovakia | 54.29 | |
| 22 | 3 | 8 | Raphaël Stacchiotti | Luxembourg | 54.44 | |
| 23 | 4 | 0 | Omar Pinzón | Colombia | 54.48 | |
| 24 | 4 | 9 | Kristinn Þórarinsson | Iceland | 54.72 | |
| 25 | 2 | 0 | Huang Yen-hsin | Chinese Taipei | 54.78 | |
| 26 | 4 | 8 | Andriy Khloptsov | Ukraine | 55.05 | |
| 27 | 1 | 4 | Andrei Tuomola | Finland | 55.69 | |
| 28 | 3 | 9 | Peter John Stevens | Slovenia | 55.76 | |
| 29 | 2 | 9 | Berk Özkul | Turkey | 56.47 | |
| 30 | 1 | 7 | Patrick Groters | Aruba | 56.56 | |
| 31 | 1 | 3 | Svetlozar Nikolov | Bulgaria | 56.75 | |
| 32 | 1 | 8 | José Alberto Quintanilla | Bolivia | 56.77 | |
| 33 | 1 | 1 | Filippos Iakovidis | Cyprus | 58.04 | |
| 34 | 1 | 6 | Leonard Kalate | Papua New Guinea | 59.56 | |
| 35 | 1 | 2 | Duran Alfonso | Honduras | 1:01.75 | |
| | 1 | 5 | Ali Boabbas | Kuwait | DSQ | |
| | 3 | 0 | Brad Tandy | South Africa | DNS | |
| | 3 | 6 | Mitch Larkin | Australia | DNS | |

### Semifinals

The semifinals were started on 13 December at 19:14.

#### Semifinal 1

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | Kliment Kolesnikov | Russia | 50.90 | Q, WJ |
| 2 | 6 | Hiromasa Fujimori | Japan | 51.50 | Q |
| 3 | 3 | Caio Pumputis | Brazil | 52.15 | Q |
| 4 | 5 | Markus Lie | Norway | 52.43 | |
| 5 | 7 | Alexis Santos | Portugal | 52.91 | |
| 6 | 2 | Heiko Gigler | Austria | 52.99 | |
| 7 | 8 | Bradlee Ashby | New Zealand | 53.14 | |
| 8 | 1 | Diego Prado | Brazil | 53.34 | |

#### Semifinal 2

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 5 | Marco Orsi | Italy | 51.42 | Q |
| 2 | 4 | Michael Andrew | United States | 51.44 | Q |
| 3 | 3 | Wang Shun | China | 51.92 | Q |
| 4 | 6 | Sergey Fesikov | Russia | 52.31 | Q |
| 5 | 2 | Kenneth To | Hong Kong | 52.33 | Q |
| 6 | 7 | Bernhard Reitshammer | Austria | 52.51 | |
| 7 | 8 | Jack Gerrard | Australia | 52.69 | |
| 7 | 1 | Simon Sjödin | Sweden | 53.02 | |

### Final

The final was held on 14 December at 19:13.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 4 | Kliment Kolesnikov | Russia | 50.63 | CR, WJ |
| | 5 | Marco Orsi | Italy | 51.03 | |
| | 3 | Michael Andrew | United States | 51.58 | |
| 4 | 1 | Sergey Fesikov | Russia | 51.63 | |
| 5 | 8 | Kenneth To | Hong Kong | 51.88 | |
| 6 | 2 | Wang Shun | China | 51.95 | |
| 7 | 7 | Caio Pumputis | Brazil | 52.28 | |
| – | 6 | Hiromasa Fujimori | Japan | DSQ | |