Usain Bolt takes to the track for his second final of the London Olympics, the men's 200m, as Kenya's David Rudisha chases his first gold medal in the men's 800m tonight at Olympic Stadium.

Jeremy Wariner, a stalwart on two Olympic gold-medal-winning 4x400m relays, has been ruled out of competing in the event in London due to a torn hamstring.

Sports evolve in cycles and it has been abundantly clear that this is Aries Merritt's time. The torch was officially passed in the Olympic 110m hurdles final, which he won in 12.92 seconds.

On a night when no one considered him a contender, when he was racing three Kenyans, an Ethiopian, and about 50 years of Americans failing to medal in the 1500m, Manzano put together the race of his life.

Bernard Lagat used his veteran wiles to pry the information he needed to form a race strategy that got him to the 5000m final, where he will be joined by U.S. teammates Galen Rupp and Lopez Lomong.

All eyes will be on two-time Olympic silver medalist Allyson Felix tonight in the women's 200m as she chases her first Olympic gold medal in the event. Here are the top three events to watch tonight.