Event Date Round Name Nationality Time Record Day Women's 4 × 100 metre freestyle relay 6 August Heats Madison Wilson (54.11) Brittany Elmslie (53.22) Bronte Campbell (53.26) Cate Campbell (51.80) Australia 3:32.39 OR 1 Women's 100 metre butterfly 6 August Semifinal Sarah Sjöström Sweden 55.84 OR 1 Women's 400 metre individual medley 6 August Final Katinka Hosszú Hungary 4:26.36 WR 1 Women's 4 × 100 metre freestyle relay 6 August Final Emma McKeon (53.41) Brittany Elmslie (53.12) Bronte Campbell (52.15) Cate Campbell (51.97) Australia 3:30.65 WR 1 Women's 400 metre freestyle 7 August Heats Katie Ledecky United States 3:58.71 OR 2 Women's 100 metre butterfly 7 August Final Sarah Sjöström Sweden 55.48 WR 2 Women's 400 metre freestyle 7 August Final Katie Ledecky United States 3:56.46 WR 2 Women's 200 metre individual medley 8 August Heats Katinka Hosszú Hungary 2:07.45 OR 3 Women's 100 metre breaststroke 8 August Final Lilly King United States 1:04.93 OR 3 Women's 200 metre individual medley 9 August Final Katinka Hosszú Hungary 2:06.58 OR 4 Women's 100 metre freestyle 10 August Heats Cate Campbell Australia 52.78 OR 5 Women's 100 metre freestyle 10 August Semifinals Cate Campbell Australia 52.71 OR 5 Women's 800 metre freestyle 11 August Heats Katie Ledecky United States 8.12.86 OR 6 Women's 100 metre freestyle 11 August Final Simone Manuel United States 52.70 OR 6 Women's 100 metre freestyle 11 August Final Penny Oleksiak Canada 52.70 OR 6 Women's 800 metre freestyle 12 August Final Katie Ledecky United States 8.04.79 WR 7