Jamaica sprinters, from left, Usain Bolt, Yohan Blake and Asafa Powell compete in the men's 100 meters final in the Athletics Grand Prix at the Crystal Palace in London. All anyone's talking about ahead of the men's 100 meters is the showdown between Olympic champion Bolt and world champion Blake, who train together. As the premier track and field event of the London Games gets started with opening heats, it seems everyone has an opinion about who's going to win -- and the answers tend to be Bolt or Blake.

AP photo by Sang Tan