I have to say Phelps is the most dominant athlete right now. I don't think Tiger Woods is even close to his imortality right now. The difference is that there arent as many events for swimming as there are in golf. However, this guy is not winning, but completely tearing up every record and winning gold by a wide margin. What's incredible is that he'll go in a race, then race again 1 hour later. When you are in the Olympics, do you know how incredibly difficult that is when your opponents are the best of the best and have been training for 3+ years. If Phelps wins the 8 medals, there's no doubt he'll be the most dominant athlete of 2008.