4 × 400 metres relay - Wikipedia
400 metres - Wikipedia
Dalilah Muhammad Breaks Her Own World Record in the 400-Meter Hurdles - The New York Times
Has a decathlon athlete ever broken a world record in a specific item? - Quora
400 metres at the Olympics - Wikipedia
Day 12 recap: Women's 400-meter hurdles world record obliterated at Tokyo Games | The Japan Times
:format(png)/cdn.vox-cdn.com/uploads/chorus_image/image/50396423/400start.0.0.png "How do lane assignments and starting spots work in track? - SBNation.com")
How do lane assignments and starting spots work in track? - SBNation.com
Women's 400m World Record is 48.25 – Žiga P. Škraba
The men's 400 world record moves rarely, but it does move dramatically
Namibia's Mboma sets world under-20 400m record of 48.54sec in Bydgoszcz
Usain Bolt record collection: the sprint king's greatest hits
Karsten Warholm Sets World Record in 400-Meter Hurdles - The New York Times
400 Metres Hurdles
/cloudfront-us-east-2.images.arcpublishing.com/reuters/NTS6U3USSBIULPSIC6WG3TIB3E.jpg "American McLaughlin breaks women's 400m hurdles world record | Reuters")
American McLaughlin breaks women's 400m hurdles world record | Reuters
400 Metres
Mighty McLaughlin shatters 400 metres hurdles world record | Reuters
Van Niekerk betters 400m world record
Tokyo Olympics: New world record by Warholm of Norway in 400m hurdles
Tokyo Olympics: List Of World Records Set | Olympics News
Brilliant Van Niekerk smashes 400m world record | Reuters
Sydney McLaughlin breaks women's 400m world record in front of home crowd | Sports | dailyemerald.com
400 Metres
Michael Norman puts world record on notice at Mt. SAC relays – Orange County Register
Usain Bolt - Wikipedia
