Katie Ledecky Léon Marchand Leon Marchand Caeleb Dressel Adam Peaty Summer McIntosh Torri Huske Michael Phelps Simone Manuel Regan Smith Ryan Murphy Gary Hall Jr. Gretchen Walsh Pan Zhanle Ariarne Titmus Daniel Wiffen Sarah Sjöström Medals COVID-19 Henrik Christiansen Cameron McEvoy Alex Walsh Bobby Finke Kate Douglass Nic Fink Luana Alonso Siobhan Haughey Kaylee McKeown Retirement Doping Allegations Qin Haiyang Sun Jiajun Andre De Grasse Doping Controversies Medal Performances Infection Prevention Health Concerns Katie Grimes Sports Partnerships Competition Events Gary Hall Jr American Swimmers Performance Lilly King Testing Protocols Mental Health Alex Shackell Australian Swimmers South Korea Hunter Armstrong Palestinian Athletes Emma Weber Zhang Yufei Victor Johansson David Popovici New Jersey Swimmers Yang Junxuan Lani Pallister Mollie O’Callaghan Ana Carolina Vieira Mona McSharry Team GB Sarah Sjostrom Erin Gemmell Zac Stubblety-Cook Female Athletes Mollie O'Callaghan Cam McEvoy Tamara Potocka