US legend Katie Ledecky at center of anticipated 'Race of Century' 400
PARIS -- Every Olympics has its defining moment: Usain Bolt in the 100 meters at the 2008 Beijing Summer Games or Sydney Crosby's golden goal for CanaPARIS -- Every Olympics has its defining moment: Usain Bolt in the 100 meters at the 2008 Beijing Summer Games or Sydney Crosby's golden goal for Cana