American star Michael Johnson wins his fourth consecutive world title in the men's 400m with a new world record time of 43.18 seconds at the 1999 World Championships in Seville.
Aug 1, 2012; London, United Kingdom; Coach Clyde Hart after practice during the London 2012 Olympic Games at Mile End Stadium. Mandatory Credit: Bob Donnan-Imagn Images Bob Donnan-Imagn Images Clyde ...
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