Team(s)/Athlete(s) of Interest: Usain Bolt

Time: 3:10 p.m.

Why You Should Watch: Usain Bolt is sitting pretty in first place as he enters the semifinals. Sure, he may not have the best time overall with fellow Jamaicans Yohan Blake and Warren Weir finishing with better times, but if you've watched his record breaking 100m race on Sunday, you'd know that having the best time going in doesn't mean much to Bolt, who has that extra gear to propel him to victory.