The winner of the 100 metre dash at the Olympics is traditionally given the title of the "fastest man alive". Since an American didn't win the 100 metre at the 1996 Olympics, the Americans started calling their 200 metre & 400 metre champion the "fastest man alive", even though Michael Johnson didn't win the 100 metre dash.
This is typical American behaviour. They change the rules as they go on the suit their interests. When Michael Johnson and the Americans were told to put their money where their mouths are, Donovan Bailey, the actual "fastest man alive" put them in their place. A 150 metre was scheduled, even though the the 100 metre dash traditionally determined the "fastest man alive". Not only did Michael Johnson lose the race, he gave up after Bailey grew a lead on him and headed into his strong point, the straightaway.
The American acted like a true and total coward. As soon as he realized he was going to lose the race, he pulled out and claimed he was injured. Instead of accepting defeat like a true champion, he went out in typical "American" style, blaming other things (his phantom injury) for his misfortunes.
Enjoy!