The men's 4 × 100 metre freestyle relay at the 2025 World Aquatics Championships was held on 27 July 2025 at the World Aquatics Championships Arena at the Singapore Sports Hub in Kallang, Singapore.

Background The United States, Australia, and Italy have consistently medalled in recent years, while China will attempt to challenge again after winning the event at the 2024 World Championships. The United States will likely field Jack Alexy, who swam 46.99 at US Nationals, and Patrick Sammon, who recorded 47.47, alongside Chris Guiliano, Destin Lasco, Jonny Kulow, and Shaine Casas; their aggregate times suggest they could approach 3:08. Australia, led by Kyle Chalmers, who swam 47.27 in April, will also likely include Flynn Southam, Kai Taylor, and Maximilian Giuliani. Italy will rely on Manuel Frigo, Thomas Ceccon, Carlos D’Ambrosio, and likely Lorenzo Zazzeri. China, with Pan Zhanle capable of 45-second relay splits, could also contend for gold.

Qualification Each National Federation could enter one team in the relay. The team had to be composed of swimmers who were also competing in the individual events, along with relay only swimmers who had to have met a specific qualifying time for the corresponding stroke and distance they would be swimming in the relay. Federations were only allowed to enter two relay-only swimmers for each relay they entered, though they could also enter relay-only swimmers from other relays which did not count toward this limitation.

Records Prior to the competition, the existing world and championship records were as follows.

The following record was established during the competition: Date Event Nation Swimmers Time Record 27 July Final Flynn Southam (47.77)Kai Taylor (47.04)Maximillian Giuliani (47.63)Kyle Chalmers (46.53) 3:08.97 CR

Heats The heats took place on 27 July at 12:45.

Rank Heat Lane Nation Swimmers Time Notes 1 3 4 Shaine Casas (48.58)Jonny Kulow (47.51)Destin Lasco (47.60) Patrick Sammon (47.48) 3:11.17 Q 2 2 4 Flynn Southam (48.12)Kai Taylor (47.55)Maximillian Giuliani (48.08) Kyle Chalmers (47.54) 3:11.29 Q 3 3 5 Carlos D'Ambrosio (47.96)Lorenzo Zazzeri (47.63)Leonardo Deplano (48.29) Manuel Frigo (48.14) 3:12.02 Q 4 2 5 Chen Juner (48.56)Wang Haoyu (47.59)Liu Wudi (48.38) Pan Zhanle (47.73) 3:12.26 Q 5 2 3 Ruslan Gaziev (48.75)Joshua Liendo (47.26)Antoine Sauve (48.37) Filip Senc-Samardzic (48.26) 3:12.64 Q 6 3 3 Jacob Mills (48.34)Duncan Scott (47.56)Jacob Whittle (48.11) Tom Dean (48.68) 3:12.69 Q 7 3 2 Nándor Németh (47.87)Hubert Kós (47.71)Dániel Mészáros (48.56) Ádám Jászó (48.57) 3:12.71 Q 8 2 8 Tajus Juska (48.60)Tomas Navikonis (47.47)Tomas Lukminas (47.83) Danas Rapšys (48.84) 3:12.74 Q, NR 9 1 3    Neutral Athlete B Kliment Kolesnikov (48.59)Vladislav Grinev (48.00)Ivan Girev (47.90) Vasilii Kukushkin (48.38) 3:12.87 10 3 6 Josha Salchow (48.21)Rafael Miroslaw (48.32)Kaii Winkler (47.52) Luca Armbruster (48.84) 3:12.89 11 3 1 Rafael Fente-Damers (48.58)Nans Mazellier (48.52)Ethan Dumesnil (48.27) Yann Le Goff (47.55) 3:12.92 12 2 1 Alexey Glivinsky (48.72)Denis Loktev (48.12)Daniel Krichevsky (48.01) Martin Kartavi (48.54) 3:13.39 NR 13 3 7 Kamil Sieradzki (48.39)Jakub Majerski (48.16)Ksawery Masiuk (47.48) Karol Ostrowski (49.57) 3:13.60 14 2 7 Jere Hribar (47.93 NR)Nikola Miljenić (48.57)Vlaho Nenadić (48.82) Toni Dragoja (48.70) 3:14.02 15 2 6 Nikola Aćin (48.78)Velimir Stjepanović (48.10)Luka Jovanović (49.16) Justin Cvetkov (48.07) 3:14.11 16 2 2 Sergio de Celis (48.24 NR)Luca Hoek Le Guenedal (47.68)Miguel Pérez-Godoy (48.86) Nacho Campos Beas (49.56) 3:14.34 17 3 0 Sander Sorensen (48.73 NR)Markus Lie (49.10)Jakob Harlem (49.84) Bjørnar Laskerud (48.99) 3:16.66 NR 18 2 0 Ardi Azman (50.03)Mikkel Lee (48.91)Jonathan Tan (48.94) Glen Lim (50.50) 3:18.38 19 1 4 Andres Dupont (48.48)Jorge Iga (48.37)Marcus Reyes-Gentry (50.36) Héctor Ruvalcaba (51.60) 3:18.81 20 3 8 Ralph Daleiden (48.60 NR)Remi Fabiani (49.37)João Carneiro (51.86) Julien Henx (51.56) 3:21.39 1 5 Did not start

Final The final took place at 10:51.

Rank Lane Nation Swimmers Time Notes 5 Flynn Southam (47.77)Kai Taylor (47.04)Maximillian Giuliani (47.63) Kyle Chalmers (46.53) 3:08.97 CR, OC 3 Carlos D'Ambrosio (47.78)Thomas Ceccon (47.10)Lorenzo Zazzeri (47.36) Manuel Frigo (47.34) 3:09.58 NR 4 Jack Alexy (47.24)Patrick Sammon (47.03)Chris Guiliano (47.43) Jonny Kulow (47.94) 3:09.64 4 7 Jacob Mills (48.51)Matthew Richards (47.32)Jacob Whittle (47.67) Duncan Scott (47.23) 3:10.73 NR 5 6 Chen Juner (48.58)Wang Haoyu (47.91)Liu Wudi (48.03) Pan Zhanle (46.63) 3:11.15 6 1 Nandor Nemeth (47.89)Szebasztián Szabó (48.11)Dániel Mészáros (48.48) Adam Jaszo (48.27) 3:12.75 7 8 Tomas Navikonis (48.37)Tomas Lukminas (47.89)Tajus Juska (48.26) Danas Rapšys (48.32) 3:12.84 8 2 Ruslan Gaziev (48.37)Joshua Liendo (47.08)Antoine Sauve (48.18) Filip Senc-Samardzic (49.26) 3:12.89

References