Team USA is hoping to add more track medals in the relay events that will take place on Friday and Saturday. Two teams will run in finals Friday, and two more, the women's 4x400-meter and men's 4x100m squads, qualified for their Saturday finals.
The U.S. women easily won its heat in the 4x400 in 3:22.09, more than a second better than second-place Russia. And that time was the best of any team in qualifying, a great sign for Team USA -- especially considering that Sanya Richards-Ross, the 400 gold medalist, didn't run in the heat.
But the really interesting development was the U.S. qualifying first for the men's 4x100 final, exactly .01 seconds ahead of Jamaica. Jamaica is still the favorite to take gold in the event, and didn't run Usain Bolt in the qualifying heat, but it did put 100m silver medalist Yohan Blake on the track. Although the U.S. didn't run either Tyson Gay or Ryan Bailey, who both ran in the 100 final, the Americans pipped the Jamaicans, who won gold in Beijing.
The Great Britain team, a medal contender, was disqualified for a late baton pass in the first heat.