Norway's Warholm breaks 400 metres hurdles world record | Reuters
Dalilah Muhammad Breaks Her Own World Record in the 400-Meter Hurdles - The New York Times
Women's 400m World Record is 48.25 – Žiga P. Škraba
The greatest race ever part II: Sydney McLaughlin wins 400m hurdles gold in world record time | Tokyo Olympic Games 2020 | The Guardian
Miller-Uibo still leads world list in 200, 400 metres | The Tribune
Mighty McLaughlin shatters 400 metres hurdles world record | Reuters
Day 12 recap: Women's 400-meter hurdles world record obliterated at Tokyo Games | The Japan Times
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How do lane assignments and starting spots work in track? - SBNation.com
4 × 400 metres relay - Wikipedia
400 metres hurdles - Wikipedia
400 Metres
Sydney McLaughlin breaks women's 400m world record in front of home crowd | Sports | dailyemerald.com
Karsten Warholm Sets World Record in 400-Meter Hurdles - The New York Times
Van Niekerk betters 400m world record
400 Metres
Tokyo Olympics: List Of World Records Set | Olympics News
200 metres - Wikipedia
Usain Bolt record collection: the sprint king's greatest hits
Men's 400 Meters: South African Wayde van Niekerk Shatters World Record | Runner's World
List of world records in athletics - Wikipedia
Michael Norman puts world record on notice at Mt. SAC relays – Orange County Register
Karsten Warholm breaks men's 400 hurdles world record in Norway
Track's Most Resilient (and Suspect) Record Is in Danger - The New York Times
Women's 400m World Record is 48.25 – Žiga P. Škraba
Has a decathlon athlete ever broken a world record in a specific item? - Quora
Namibia's Mboma sets world under-20 400m record of 48.54sec in Bydgoszcz
