Rank Lane Nation Swimmers Time Notes 01 ! 4 United States Mallory Comerford (52.59 AM) Kelsi Worrell (53.16) Katie Ledecky (53.83) Simone Manuel (52.14) 3:31.72 AM 02 ! 3 Australia Shayna Jack (53.75) Bronte Campbell (52.14) Brittany Elmslie (53.83) Emma McKeon (52.29) 3:32.01 03 ! 5 Netherlands Kim Busch (54.05) Femke Heemskerk (52.84) Maud van der Meer (53.77) Ranomi Kromowidjojo (51.98) 3:32.64 4 2 Canada Sandrine Mainville (53.77) Chantal Van Landeghem (52.97) Kayla Sanchez (54.16) Penny Oleksiak (52.98) 3:33.88 5 6 Sweden Sarah Sjöström (51.71 WR) Michelle Coleman (52.68) Ida Lindborg (55.59) Louise Hansson (53.96) 3:33.94 NR 6 7 China Zhu Menghui (53.79) Zhang Yufei (54.31) Wu Yue (54.96) Ai Yanhan (53.43) 3:36.49 7 1 Japan Rikako Ikee (54.59) Tomomi Aoki (54.45) Yui Yamane (54.62) Chihiro Igarashi (54.58) 3:38.24 8 8 Denmark Signe Bro (54.72) Sarah Bro (56.60) Emilie Beckmann (54.84) Pernille Blume (52.70) 3:38.86