|Events||100, 200m 4 x 100m relay|
|Credentials||Best known as a 200m runner, he holds the Jamaican record at 19.75 seconds and has run the year's fastest at 19.83 seconds. Broke Powell's world 100m record in New York City this year with a time of 9.72 seconds.|
|Credentials||Won the U.S. trials in a season-best time of 19.86 seconds, fastest only to Bolt. Finished 2nd in the 100m, but the 200m represents his best chance for a medal in Beijing. He has a personal best of 19.69 seconds from 2006.|
|Credentials||Reigning Olympic 200m champion. Silver medalist at the 2007 IAAF World Championships and runner-up to Dix at the U.S. trials, just seven one-thousandths behind him. Both timed in 19.86 seconds.|
On A Roll
With his world 100m record, Bolt, the 21-year-old Jamaican has enviable speed. The 200m is his best event.
The X Factor
Heats and semi-finals can reduce even the world's best to also-rans. One slip up and they are gone. The Americans must hold their peak to be in shape at the Olympics.
Under the Radar
Saidy Ndure Jaysuma obtained Norwegian citizenship a year ago and celebrated with a win at the IAAF World Athletics final in Stuttgart, where he ran 19.89 seconds. This year he has run a personal best in the 100m of 10.01 seconds.
Edmonton's Brian Barnett achieved the required Olympic A+ standard a year ago when he made the world championship semi-final with a time of 20.31 seconds. He will be joined by Canadian champion Jared Connaughton of Charlottetown, P.E.I., who ran a personal best of 20.34 this season at a meet in Arlington, Texas. He also won nationals in a championship record of 20.35. An appearance in the final would be too much to expect from either of these two. But they are both young and focused and could surprise.
With his phenomenal world 100m record, Usain Bolt is the favourite to win the Olympic 200m gold. He is also capable of beating Michael Johnson's world record for this distance. The only thing that might see him perform at less than his best is the number of races he will be required to do.
The absence of Tyson Gay should make the event a little easier for Bolt to win. But much depends on who survives the weeks between the respective Olympic trials and the first round heats in Beijing.