Katie Ledecky broke the world record in the 400-meter freestyle at the 2016 Olympics.
Ryan Murphy Downs 100 Backstroke World Record to Open 400 Medley Relay
Daiya Seto takes aim at Michael Phelps' 400 IM record | The Japan Times
Great Britain Annihilates World Record In Mixed 400 Medley For Decisive Gold
Becca Meyers Smashes 400-meter IM World Record At Para Swimming Nationals
USA Takes Down World Record in Women's 400 Medley Relay
400m IM World Record
Men's Relay of the Year: U.S. Keeps 400 Medley Relay Streak Alive
Aussies edge Team USA in mixed medley relay at FINA World Championships
Olympics: Great Britain Scares World Record in 400 Mixed Medley Relay
Katinka Hosszu shatters world record in 400 IM; Maya DiRado wins silver
Katinka Hosszu set a world record in the women's 400 IM. Let the irresponsible doping accusations begin.
Swimming Highlights: Dressel, McKeon and Men's Relay Team Win Gold - The New York Times
Swimming at the 2016 Summer Olympics – Women's 400 metre individual medley - Wikipedia
Sarasota Men Set Masters 400 Medley Relay World Record
Ledecky sets record in 400 free; Phelps gets 19th gold | The Japan Times
Tokyo Relay Splits: Dressel's 49.0 Fly Leg Leads U.S. Men To World Record
Regan Smith breaks another world record in the 100 backstroke leading off the 400 medley relay! (57.57) : r/Swimming
Condors Team of Smoliga, King, Dahlia and Brown Set World Record in 400 Medley
Katie Ledecky's early Olympic success not surprising - Sports Illustrated
List of world records in swimming - Wikipedia
Swimming-Tunisia, Japan celebrate unexpected gold, Australia smash world record | Reuters
Hungarian Swimming Legend Katinka Hosszú Again World Record Holder On 400m Medley - Video! - Hungary Today
 "Tokyo Olympics: US Swimmers Smash World Record To Win Men's 4x100m Medley Relay Gold | Olympics News")
Tokyo Olympics: US Swimmers Smash World Record To Win Men's 4x100m Medley Relay Gold | Olympics News
