Exercise rider Benito Alvarado takes Kentucky Derby hopeful Uncle Sigh for a morning workout at Churchill Downs Tuesday, April 29, 2014, in Louisville, Ky. (AP Photo/Garry Jones)
Hot walker Francisco Ugarte holds Kentucky Derby hopeful Wicked Strong after a morning workout at Churchill Downs Monday, April 28, 2014, in Louisville, Ky. (AP Photo/Garry Jones)
Exercise rider Kelvin Pahal takes Kentucky Derby hopeful Wicked Strong for a morning workout at Churchill Downs Monday, April 28, 2014, in Louisville, Ky. (AP Photo/Charlie Riedel)
In this image taken with a slow shutter speed, exercise rider Kelvin Pahal takes Kentucky Derby hopeful Wicked Strong for a morning workout at Churchill Downs Tuesday, April 29, 2014, in Louisville, Ky. (AP Photo/Morry Gash)