The American quartet of Hunter Armstrong, Nic Fink, Claire Curzan and Kate Douglass won mixed medley gold by nearly three seconds in a time of 3:40.22.
Roundup: Three new swimming world champions emerge in Doha bignewsnetwork.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from bignewsnetwork.com Daily Mail and Mail on Sunday newspapers.
Doha, Qatar: America s Nic Fink claimed men s 100m breaststroke gold as Britain s world record holder Adam Peaty made his return to action with a bron.
25-year-old Sam Williamson fired off a new Aussie national record of 26.41 en route to taking the top seed in the men's 50m breaststroke for tomorrow's final.