As much as it's probably overblown and talked about too much considering there are so many great athletes and great sports, you can't help but get excited about (U.S. swimmer Michael) Phelps and (Jamaican sprinter) Usain Bolt, and not just their attempts to repeat what they did in Beijing, but also simply because of the guys challenging them ... The two greatest rivalries going into these Games involve guys from the same country: Ryan Lochte, who's a real challenger to Phelps, and Yohan Blake, who's a real challenger to Bolt. He beat him in both the 100 and 200 and the Jamaican trials. I think those are the biggest stories.