DERBY FEVER

Visionaire walks off of the track during the morning training for the Kentucky Derby on April 28, 2008 at Churchill Downs in Louisville, Kentucky. (Photo by Andy Lyons/Getty Images)

Colonel John (r) walks on the track during the morning training for the Kentucky Derby on April 29, 2008 at Churchill Downs. (Photo by Andy Lyons/Getty Images)

Smooth Air (l) runs on the track during the morning training for the Kentucky Derby on April 29, 2008 at Churchill Downs. (Photo by Andy Lyons/Getty Images)

Big Brown (r) with exercise rider Michelle Nevin aboard walks to the track during the morning training for the Kentucky Derby on April 29, 2008 at Churchill Downs. (Photo by Andy Lyons/Getty Images)

An exercise rider is picture aboard her horse at sunrise during the morning training for the Kentucky Derby on April 28, 2008 at Churchill Downs. (Photo by Andy Lyons/Getty Images)

Trainer Barclay Tagg, right, leads Big Truck, (r) one of his two Kentucky Derby hopefuls, off the track at Churchill Downs in Louisville, Ky., Sunday, April 27, 2008. Exercise rider Kristen Troxell is aboard Big Truck. (AP Photo/Garry Jones)