Day 2 Recap: 2013 Prefontaine Classic - FloTrack
Big Ten Track and Field Championships at a glance | Star Tribune
How van Niekerk broke the 400m world record
Karsten Warholm breaks men's 400 hurdles world record in Norway
Wayde van Niekerk: Five things to know about the Olympic 400m champion and world record holder
Naser stuns the world with fastest 400m time since East German Koch
Brilliant Van Niekerk smashes 400m world record | Reuters
Kenny Selmon Claims National Title in 400-Meter Hurdles, Earns Spot on Team USA - Chapelboro.com
Local Olympic roundup: Chesapeake native Michael Cherry runs fastest time overall in 400-meter first round - The Virginian-Pilot
400 Metres
Matthew Boling runs fastest high school 100 meters in history in 9.98 seconds - The Washington Post
Indianapolis sprinter Lynna Irby wins in Monaco with world's best time of 2020
Blazing time for SAU's Kalawan - HBCU Gameday
Salwa Eid Naser escapes drugs ban after doping official knocks on the wrong door | Sport | The Times
4 Goals of 400m Training
USA Track Olympic Trials: Lynna Irby advances in 400 meters
Wayde van Niekerk smashes Michael Johnson's record to claim 400m gold | Rio 2016 | The Guardian
Why The 800 Meter Run Should Be Treated Like The 400 Meter Dash
Niekerk breaks 400m world record - DTNext.in
43.03 – The Fastest 400m in History – Žiga P. Škraba
4 × 400 metres relay - Wikipedia
Tyler Johnson Runs Nation's Fastest 400-Meter Time, Wins Three Gold Medals to Highlight Ohio State's Performances at Big Ten Indoor Championships | Eleven Warriors
Kadecia Baird of Medgar Evers HS won't represent Guyana in London Olympics despite country's best time in 400-meter race - New York Daily News
Men's 400 Meters: South African Wayde van Niekerk Shatters World Record | Runner's World
