# 2018 FINA World Swimming Championships (25 m) – Mixed 4 × 50 metre freestyle relay

The mixed 4 × 50 metre freestyle relay competition of the 2018 FINA World Swimming Championships (25 m) was held on 12 December 2018.

## Records

Prior to the competition, the existing world and championship records were as follows.
| | Name | Nation | Time | Location | Date |
| World record | Nyls Korstanje (21.42) Kyle Stolk (20.66) Ranomi Kromowidjojo (23.01) Femke Heemskerk (23.30) | Netherlands | 1:28.39 | Copenhagen | 16 December 2017 |
| Championship record | Josh Schneider (20.94) Matt Grevers (20.75) Madison Kennedy (23.63) Abbey Weitzeil (23.25) | United States | 1:28.57 | Doha, Qatar | 6 December 2014 |
The following records were established during the competition:
| Date | Event | Name | Nation | Time | Record |
| 14 December | Final | Caeleb Dressel (20.43) Ryan Held (20.60) Mallory Comerford (23.44) Kelsi Dahlia (23.42) | United States | 1:27.89 | WR, CR |

## Results
### Heats

The heats were started at 11:07.
| Rank | Heat | Lane | Nation | Swimmers | Time | Notes |
| 1 | 5 | 5 | United States | Michael Andrew (21.13) Michael Chadwick (20.66) Olivia Smoliga (23.87) Madison Kennedy (24.14) | 1:29.80 | Q |
| 2 | 4 | 4 | Russia | Evgeny Rylov (21.21) Ivan Kuzmenko (20.67) Arina Surkova (24.05) Rozaliya Nasretdinova (24.03) | 1:29.96 | Q |
| 3 | 5 | 3 | Australia | Cameron McEvoy (21.10) Cameron Jones (21.06) Holly Barratt (23.85) Emily Seebohm (24.11) | 1:30.12 | Q |
| 4 | 3 | 5 | Japan | Kosuke Matsui (21.20) Katsumi Nakamura (21.05) Aya Sato (24.00) Runa Imai (24.07) | 1:30.32 | Q |
| 5 | 5 | 4 | Netherlands | Jesse Puts (21.42) Stan Pijnenburg (21.23) Kim Busch (23.85) Valerie van Roon (24.06) | 1:30.56 | Q |
| 6 | 5 | 0 | Brazil | Marcelo Chierighini (21.64) Matheus Santana (21.42) Larissa Oliveira (24.25) Etiene Medeiros (23.47) | 1:30.78 | Q |
| 7 | 4 | 9 | Finland | Andrei Tuomola (22.10) Ari-Pekka Liukkonen (20.91) Jenna Laukkanen (24.34) Mimosa Jallow (24.16) | 1:31.51 | Q |
| 8 | 3 | 4 | Italy | Santo Condorelli (21.30) Andrea Vergani (20.98) Elena Di Liddo (24.58) Federica Pellegrini (25.02) | 1:31.88 | Q |
| 9 | 4 | 3 | Belarus | Artsiom Machekin (21.73) Viktar Staselovich (21.33) Anastasiya Shkurdai (24.52) Nastassia Karakouskaya (24.34) | 1:31.92 | R |
| 10 | 2 | 6 | Germany | Damian Wierling (21.75) Marius Kusch (21.49) Jessica Steiger (24.26) Annika Bruhn (24.84) | 1:32.34 | R |
| 11 | 4 | 5 | China | Hou Yujie (22.23) Cao Jiwen (22.11) Wu Yue (23.76) Yang Junxuan (24.71) | 1:32.81 | |
| 12 | 5 | 6 | Turkey | Hüseyin Emre Sakçı (21.54) Kemal Arda Gürdal (21.35) Selen Özbilen (25.03) Ekaterina Avramova (25.00) | 1:32.92 | |
| 13 | 4 | 6 | South Africa | Douglas Erasmus (21.87) Brad Tandy (20.98) Erin Gallagher (24.50) Rebecca Meder (25.86) | 1:33.21 | |
| 14 | 2 | 5 | New Zealand | Daniel Hunter (21.95) Wilrich Coetzee (22.08) Rebecca Moynihan (25.04) Paige Flynn (25.07) | 1:34.14 | |
| 15 | 3 | 3 | Hong Kong | Kenneth To (21.64) Stephanie Au (24.99) Sze Hang Yu (25.05) Cheuk Ming Ho (22.99) | 1:34.67 | |
| 16 | 3 | 6 | Chinese Taipei | Wu Chun-feng (22.09) Lin Chien-liang (22.11) Huang Mei-chien (25.16) Lin Pei-wun (25.50) | 1:34.86 | |
| 17 | 3 | 9 | Bosnia and Herzegovina | Nikola Bjelajac (22.68) Adi Mešetović (21.91) Amina Kajtaz (26.15) Lamija Medošević (25.42) | 1:36.16 | |
| 18 | 1 | 2 | Slovakia | Ádám Halás (22.77) Marek Botík (23.26) Barbora Mikuskova (25.41) Karolina Hájková (24.78) | 1:36.22 | |
| 19 | 1 | 5 | Latvia | Ģirts Feldbergs (22.68) Daniils Bobrovs (23.65) Ieva Maļuka (25.67) Gabriela Ņikitina (24.71) | 1:36.71 | |
| 20 | 2 | 1 | South Korea | Kang Ji-seok (23.15) Lee Ju-ho (23.61) Ko Miso (25.67) Park Ye-rin (25.98) | 1:38.41 | |
| 21 | 2 | 0 | Mauritius | Bradley Vincent (22.01) Mathieu Marquet (23.81) Elodie Poo-cheong (26.70) Camille Koenig (27.26) | 1:39.78 | |
| 22 | 4 | 2 | Armenia | Vladimir Mamikonyan (23.62) Ani Poghosyan (27.56) Artur Barseghyan (22.38) Varsenik Manucharyan (27.17) | 1:40.73 | |
| 23 | 3 | 2 | Seychelles | Dean Hoffman (23.88) Felicity Passon (26.05) Therese Soukup (27.44) Samuele Rossi (23.67) | 1:41.04 | |
| 24 | 3 | 1 | Andorra | Bernat Lomero (24.29) Patrick Pelegrina Cuén (23.81) Mónica Ramírez (26.90) Nàdia Tudó Cubells (26.81) | 1:41.81 | |
| 25 | 5 | 8 | Moldova | Dan Siminel (23.67) Nichita Bortnicov (24.68) Tatiana Chișca (27.22) Tatiana Salcuțan (26.30) | 1:41.87 | |
| 26 | 5 | 9 | Macau | Chao Man Hou (23.37) Lin Sizhuang (23.39) Tan Chi Yan (27.79) Cheang Weng Lam (27.61) | 1:42.16 | |
| 27 | 5 | 2 | Singapore | Malcolm Low (24.27) Ardi Zulhilmi Mohamed Azman (25.12) Rachel Tseng (26.33) Nicholle Toh (26.78) | 1:42.50 | |
| 28 | 1 | 1 | Panama | Isaac Beitia (23.08) Nimia Murua (27.26) María Castillo (28.32) Édgar Crespo (24.24) | 1:42.90 | |
| 28 | 3 | 8 | Mongolia | Myagmaryn Delgerkhüü (24.34) Batbayaryn Enkhkhüslen (26.69) Enkhzul Khuyagbaatar (27.81) Zandanbal Gunsennorov (24.06) | 1:42.90 | |
| 30 | 2 | 9 | Nicaragua | María Hernández (27.12) Eisner Barberena (23.85) Karla Abarca (27.54) Kener Torrez (24.64) | 1:43.15 | |
| 31 | 5 | 1 | Costa Rica | Beatriz Padrón (26.52) Daniela Alfaro (28.21) Arnoldo Herrera (24.38) Bryan Alvaréz (24.34) | 1:43.45 | |
| 32 | 1 | 7 | Antigua and Barbuda | Stefano Mitchell (23.39) Olivia Fuller (27.98) Bianca Mitchell (28.82) Noah Mascoll-Gomes (23.34) | 1:43.53 | |
| 33 | 3 | 7 | Jordan | Mohammed Bedour (23.28) Amro Al-Wir (24.69) Lara Aklouk (29.31) Leedia Alsafadi (27.89) | 1:45.17 | |
| 34 | 5 | 7 | Mozambique | Ludovico Corsini (25.04) Jannat Bique (28.74) Alicia Mateus (29.14) Igor Mogne (24.20) | 1:47.12 | |
| 35 | 2 | 2 | Madagascar | Heriniavo Rasolonjatovo (24.67) Lalanomena Andrianirina (25.20) Tiana Rabarijaona (28.52) Samantha Rakotovelo (29.89) | 1:48.28 | |
| 36 | 4 | 8 | Papua New Guinea | Leonard Kalate (24.43) Josh Tarere (24.83) Georgia-Leigh Vele (28.32) Rehema Kalate (30.82) | 1:48.40 | |
| 37 | 2 | 7 | Tonga | Charissa Panuve (30.17) Finau Ohuafi (25.48) Noelani Day (29.40) Amini Fonua (23.37) | 1:48.42 | |
| 38 | 2 | 8 | Guam | Benjamin Schulte (23.62) Amanda Joy Poppe (31.01) Mineri Kurotori Gomez (29.53) James Hendrix (24.92) | 1:49.08 | |
| 39 | 1 | 6 | Turks and Caicos Islands | Arleigha Hall (27.37) Jack Parlee (27.48) Alex Maclaren (31.49) Luke Haywood (25.77) | 1:52.11 | |
| 40 | 2 | 4 | Tajikistan | Olimjon Ishanov (25.85) Karina Klimyk (32.00) Fakhriddin Madkamov (27.29) Anastasiya Tyurina (29.39) | 1:54.53 | |
| 41 | 4 | 1 | Maldives | Aishath Sausan (31.25) Mubal Azzam Ibrahim (27.35) Hamna Ahmed (32.35) Imaan Ali (26.75) | 1:57.70 | |
| | 1 | 3 | Sierra Leone | | DNS | |
| | 1 | 4 | Kenya | Ridhwan Mohamed Rebecca Kamau Imara-Bella Thorpe Danilo Rosafio | DNS | |
| | 2 | 3 | Venezuela | | DNS | |
| | 4 | 0 | Benin | | DNS | |
| | 4 | 7 | Senegal | | DNS | |
| | 3 | 0 | Switzerland | Manuel Leuthard (22.74) Ivo Staub Alexandra Touretski Svenja Stoffel | DSQ | |

### Final

The final was held at 20:44.
| Rank | Lane | Nation | Swimmers | Time | Notes |
| | 4 | United States | Caeleb Dressel (20.43) Ryan Held (20.60) Mallory Comerford (23.44) Kelsi Dahlia (23.42) | 1:27.89 | WR |
| | 2 | Netherlands | Jesse Puts (21.17) Stan Pijnenburg (21.18) Ranomi Kromowidjojo (23.09) Femke Heemskerk (23.07) | 1:28.51 | |
| | 5 | Russia | Vladimir Morozov (20.75) Evgeny Sedov (20.66) Maria Kameneva (23.66) Rozaliya Nasretdinova (23.66) | 1:28.73 | |
| 4 | 6 | Japan | Katsumi Nakamura (21.03) Kosuke Matsui (20.90) Aya Sato (23.62) Runa Imai (23.96) | 1:29.51 | |
| 5 | 7 | Brazil | Matheus Santana (21.35) César Cielo (20.80) Larissa Oliveira (24.45) Etiene Medeiros (23.31) | 1:29.91 | |
| 6 | 3 | Australia | Cameron McEvoy (21.04) Cameron Jones (21.11) Holly Barratt (23.90) Emily Seebohm (24.04) | 1:30.09 | |
| 7 | 8 | Italy | Santo Condorelli (21.09) Andrea Vergani (21.06) Federica Pellegrini (24.70) Elena Di Liddo (24.11) | 1:30.96 | |
| 8 | 1 | Finland | Andrei Tuomola (22.26) Ari-Pekka Liukkonen (20.84) Jenna Laukkanen (24.06) Mimosa Jallow (24.07) | 1:31.23 | |