It's not too early to declare a rivalry between Animal Kingdom and Shackleford. A 20-1 longshot, Animal Kingdom surprised the racing world by winning the Kentucky Derby, overtaking the pacesetting Shackleford, who faded to fourth down the stretch. Shackleford had his revenge in the shorter Preakness (shown here), staving off a furious rally from Animal Kingdom. The Belmont may be the rubber match, with the winner leading the charge for champion 3-year-old honors or even Horse of the Year.