to start calling him "The Infomercial." But until then, he'll have to settle for being one of the best 200-meter sprinters in the world and a challenger to medal Saturday.

Heck, Bolt even has some competition coming from his own country. Warren Weir, who won the bronze in London last summer, set his own personal-best time this year at 19.79, a mere six-hundredths of a second away from his more famous countryman's best of the year.

Bolt will advance, but Friday will give us a great look at his competition.

Men's 5,000-Meter Final

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Elsewhere on the track, history could be made if Mo Farah's dominance of the distance world continues Friday evening. The 30-year-old Brit got a major monkey off his back already at the World Championships, defeating Ethiopian rivalIbrahim Jeilan in a thrilling sprint to the finish in the 10,000-meter race Saturday.

A neck-and-neck battle until about the final 100 or so meters, Farah put on the jets to pull away and atone for his disappointing defeat at Jeilan's hands in 2011. Having finished fifth in his qualifying meet for the less daunting 5,000-meter final Friday night, fans in Moscow could be on hand for an unprecedented treat.

If Farah were to defeat the stout field, he'll become just the second man in history to hold the World and Olympic 5,000- and 10,000-meter golds, joining Ethiopia's KenenisaBekel. Farah pulled off a shocking semi-upset of the field in London, defeating a bevy of runners from Ethiopia and Kenya who normally dominate the distance world.

Will Mo Farah or Usain Bolt